Electric motor, and outdoor unit of air conditioner employing same

Abstract

The disclosed outdoor unit of an air conditioner comprises an electric motor for rotating a fan that generates a flow of air passing through an outdoor heat exchanger. The electric motor comprises a stator and a rotor. The rotor includes a plurality of rotors, a plurality of magnets, and a resin molded part integrally molded, using resin, to the rotors and the magnets. A plurality of rotor cores are arranged to be spaced apart from each other in the circumferential direction. The plurality of magnets are accommodated in the plurality of magnet accommodation units between the plurality of rotor cores. A plurality of magnet openings are provided in at least one of the upper surface and the lower surface of the resin molded part. Each of the plurality of magnet openings overlaps at least one of the plurality of magnet accommodation parts. The geometric centers of the plurality of magnet openings are displaced in the circumferential direction with respect to a center line in the centrifugal direction of the corresponding magnet accommodation part from among the plurality of magnet accommodation parts.

Description

Electric motor and outdoor unit of an air conditioner employing the same

[0001] The present disclosure relates to an electric motor and an outdoor unit of an air conditioner employing the same.

[0002] Electric motors are used as rotary drive devices for various equipment. Japanese Patent Publication No. 2021-097527 discloses a brushless motor having a stator and a rotor rotatably disposed inside the stator. In the rotor of the disclosed brushless motor, a plurality of magnets are received in magnet receiving portions formed radially. The rotor has a cover portion made of synthetic resin installed at one end in the axial direction. The cover portion communicates with the magnet receiving portion and has a hole into which a magnet is inserted. The hole has a guide portion that contacts the magnet and guides the magnet to a predetermined position.

[0003] An outdoor unit of an air conditioner according to one aspect of the present disclosure may include an outdoor heat exchanger, a fan that generates an airflow passing through the outdoor heat exchanger, and an electric motor that rotates the fan. The electric motor may include a stator that generates a rotating magnetic field and a rotor that is opposed to the stator with an air gap between them and rotates by means of interaction with the rotating magnetic field. The rotor may include a plurality of rotors, a plurality of magnets, and a resin molded portion integrally molded with the same in resin. A plurality of rotor cores are arranged spaced apart from each other in the circumferential direction. A plurality of magnets are housed in a plurality of magnet housings between the plurality of rotor cores. A plurality of magnet openings are provided on at least one of the upper and lower surfaces of the resin molded portion. Each of the plurality of magnet openings overlaps with at least one of the plurality of magnet housings. The geometric center of the plurality of magnet openings is circumferentially deviated with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

[0004] An electric motor according to one aspect of the present disclosure comprises a stator and a rotor. The stator generates a rotating magnetic field. The rotor is opposed to the stator with an air gap between them and rotates by interaction with the rotating magnetic field. The rotor may include a plurality of rotors, a plurality of magnets, and a resin molded portion integrally formed with the same in resin. A plurality of rotor cores are arranged spaced apart from each other in the circumferential direction. A plurality of magnets are housed in a plurality of magnet housings between the plurality of rotor cores. A plurality of magnet openings are provided on at least one of the upper and lower surfaces of the resin molded portion. Each of the plurality of magnet openings overlaps with at least one of the plurality of magnet housings. The geometric center of the plurality of magnet openings is circumferentially deviated with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

[0005] FIG. 1 is a schematic cross-sectional view of an electric motor according to one embodiment of the present disclosure.

[0006] FIG. 2 is an exemplary perspective view of a rotor of an electric motor according to one embodiment of the present disclosure illustrated in FIG. 1.

[0007] Figures 3a and 3b are drawings showing an example of a method for determining the position of a magnet.

[0008] FIG. 4 shows an example of a lower mold in a method for manufacturing a rotor according to one embodiment of the present disclosure.

[0009] FIG. 5 shows a rotor intermediate body having a plurality of magnet housings provided in a lower mold in a method for manufacturing a rotor according to one embodiment of the present disclosure.

[0010] FIG. 6 shows a plurality of magnets arranged in a plurality of magnet housings in a method for manufacturing a rotor according to one embodiment of the present disclosure.

[0011] FIG. 7 shows an upper mold combined with a lower mold in a method for manufacturing a rotor according to one embodiment of the present disclosure.

[0012] Figure 8 shows the upper mold separated after resin molding.

[0013] FIG. 9 is a perspective view of a rotor manufactured by the manufacturing method according to the first embodiment.

[0014] FIG. 10 is a rear view of a rotor portion manufactured by the manufacturing method according to the first embodiment.

[0015] FIG. 11 is a perspective view of a rotor manufactured by a manufacturing method according to a second embodiment of the present disclosure.

[0016] FIG. 12 is a partial rear view of a rotor manufactured by the manufacturing method according to the second embodiment.

[0017] FIG. 13 is a perspective view of a rotor manufactured by a manufacturing method according to a third embodiment of the present disclosure.

[0018] FIG. 14 is a partial rear view of a rotor manufactured by the manufacturing method according to the third embodiment.

[0019] FIG. 15 is a perspective view of a rotor manufactured by a manufacturing method according to the fourth embodiment of the present disclosure.

[0020] FIG. 16 is a partial rear view of a rotor manufactured by the manufacturing method according to the fourth embodiment.

[0021] FIG. 17 is a schematic diagram of one embodiment of an air conditioner according to the present disclosure.

[0022] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments.

[0023] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.

[0024] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0025] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0026] For example, the phrase “at least one of A, B, and C” may include one of A, B, C, A and B, A and C, B and C, and A and B and C.

[0027] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.

[0028] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish a component from another component and do not limit the components in other aspects (e.g., importance or order).

[0029] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0030] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0031] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0032] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0033] An air conditioner according to various embodiments is a device that performs functions such as air purification, ventilation, humidity control, cooling, or heating in an air-conditioned space (hereinafter referred to as "indoor"), and means a device having at least one of these functions.

[0034] According to one embodiment, an air conditioner may include a heat pump device to perform a cooling or heating function. The heat pump device may include a refrigeration cycle in which a refrigerant circulates along a compressor, a first heat exchanger, an expansion device, and a second heat exchanger. All components of the heat pump device may be housed in a single housing that forms the exterior of the air conditioner, such as a window air conditioner or a portable air conditioner. Alternatively, some components of the heat pump device may be housed separately in multiple housings that form a single air conditioner, such as a wall-mounted air conditioner, a stand-type air conditioner, or a system air conditioner.

[0035] An air conditioner comprising a plurality of housings may include at least one outdoor unit installed outdoors and at least one indoor unit installed indoors. For example, the air conditioner may be configured such that one outdoor unit and one indoor unit are connected via refrigerant pipes. For example, the air conditioner may be configured such that one outdoor unit is connected via refrigerant pipes to two or more indoor units. For example, the air conditioner may be configured such that two or more outdoor units and two or more indoor units are connected via a plurality of refrigerant pipes.

[0036] The outdoor unit can be electrically connected to the indoor unit. For example, information (or commands) for controlling the air conditioner can be entered through an input interface provided on the outdoor unit or the indoor unit, and the outdoor unit and the indoor unit can operate simultaneously or sequentially in response to user input.

[0037] The air conditioner may include an outdoor heat exchanger provided in the outdoor unit, an indoor heat exchanger provided in the indoor unit, and a refrigerant pipe connecting the outdoor heat exchanger and the indoor heat exchanger.

[0038] An outdoor heat exchanger can perform heat exchange between the refrigerant and the outdoor air by utilizing the phase change of the refrigerant (e.g., evaporation or condensation). For example, while the refrigerant condenses in the outdoor heat exchanger, the refrigerant releases heat to the outdoor air, and while the refrigerant flowing through the outdoor heat exchanger evaporates, the refrigerant can absorb heat from the outdoor air.

[0039] Indoor units are installed indoors. For example, indoor units can be classified into ceiling-mounted, stand-type, and wall-mounted units depending on how they are placed. For example, ceiling-mounted indoor units can be classified into 4-way, 1-way, and duct-type units depending on the method of air discharge.

[0040] Similarly, an indoor heat exchanger can perform heat exchange between the refrigerant and the indoor air by utilizing the phase change of the refrigerant (e.g., evaporation or condensation). For example, while the refrigerant evaporates in the indoor unit, it can absorb heat from the indoor air, and the room can be cooled by blowing the cooled indoor air as it passes through the cooled indoor heat exchanger. Additionally, while the refrigerant condenses in the indoor heat exchanger, it can release heat to the indoor air, and the room can be heated by blowing the heated indoor air as it passes through the high-temperature indoor heat exchanger.

[0041] In other words, an air conditioner performs cooling or heating functions through the phase change process of a refrigerant circulating between an outdoor heat exchanger and an indoor heat exchanger; to facilitate this refrigerant circulation, the air conditioner may include a compressor that compresses the refrigerant. The compressor can draw in refrigerant gas through a suction port and compress the refrigerant gas. The compressor can discharge high-temperature, high-pressure refrigerant gas through a discharge port. The compressor may be placed inside the outdoor unit.

[0042] The refrigerant may circulate through the refrigerant pipe in the order of the compressor, outdoor heat exchanger, expansion device, and indoor heat exchanger, or in the order of the compressor, indoor heat exchanger, expansion device, and outdoor heat exchanger.

[0043] For example, if an air conditioner has one outdoor unit and one indoor unit directly connected through a refrigerant pipe, the refrigerant can be arranged to circulate between the outdoor unit and the indoor unit through the refrigerant pipe.

[0044] For example, in an air conditioner, if one outdoor unit is connected to two or more indoor units via refrigerant pipes, the refrigerant may flow to multiple indoor units through refrigerant pipes branching from the outdoor unit. The refrigerant discharged from multiple indoor units may be combined and circulated back to the outdoor unit. For example, multiple indoor units may each be directly connected in parallel to a single outdoor unit via separate refrigerant pipes.

[0045] Multiple indoor units can each operate independently according to an operating mode set by the user. That is, some of the multiple indoor units can operate in cooling mode while others operate in heating mode simultaneously. In this case, the refrigerant may be arranged to flow into each indoor unit in a selectively high-pressure or low-pressure state along a designated circulation path via a flow path switching valve to be described later, and to be discharged and circulated to the outdoor unit.

[0046] For example, when two or more outdoor units and two or more indoor units are connected through multiple refrigerant pipes, the refrigerant discharged from multiple outdoor units may be combined and flow through a single refrigerant pipe, and then branch out again at some point to flow into multiple indoor units.

[0047] Multiple outdoor units may all be driven or at least some may not be driven, depending on the operating load corresponding to the operating amount of multiple indoor units. In this case, the refrigerant may be arranged to flow into and circulate to the outdoor units that are selectively driven through a flow path switching valve. The air conditioner may include an expansion device to lower the pressure of the refrigerant flowing into the heat exchanger. For example, the expansion device may be placed inside the indoor unit or inside the outdoor unit, or it may be placed in both.

[0048] For example, an expansion device can lower the temperature and pressure of the refrigerant by utilizing a throttling effect. The expansion device may include an orifice that can reduce the cross-sectional area of ​​the flow path. The temperature and pressure of the refrigerant passing through the orifice can be lowered.

[0049] The expansion device can be implemented, for example, as an electronic expansion valve capable of controlling the opening ratio (the ratio of the cross-sectional area of ​​the valve's flow path in the partially open state to the cross-sectional area of ​​the valve's flow path in the fully open state). The amount of refrigerant passing through the expansion device can be controlled depending on the opening ratio of the electronic expansion valve.

[0050] The air conditioner may further include a flow switching valve positioned on the refrigerant circulation path. The flow switching valve may include, for example, a 4-way valve. The flow switching valve can determine the refrigerant circulation path depending on the operating mode of the indoor unit (e.g., cooling operation or heating operation). The flow switching valve may be connected to the discharge port of the compressor.

[0051] The air conditioner may include an accumulator. The accumulator may be connected to the suction port of the compressor. Low-temperature, low-pressure refrigerant evaporated from an indoor heat exchanger or an outdoor heat exchanger may be introduced into the accumulator.

[0052] The accumulator can separate the refrigerant liquid from the refrigerant gas when the refrigerant mixed with the refrigerant gas is introduced, and supply the refrigerant gas from which the refrigerant liquid has been separated to the compressor.

[0053] An outdoor fan may be provided near the outdoor heat exchanger. The outdoor fan can blow outdoor air onto the outdoor heat exchanger to facilitate heat exchange between the refrigerant and the outdoor air.

[0054] The outdoor unit of the air conditioner may include at least one sensor. For example, the sensor of the outdoor unit may be provided as an environment sensor. The outdoor unit sensor may be placed at any location inside or outside the outdoor unit. For example, the outdoor unit sensor may include, for instance, a temperature sensor for detecting the air temperature around the outdoor unit, a humidity sensor for detecting the air humidity around the outdoor unit, a refrigerant temperature sensor for detecting the refrigerant temperature of the refrigerant pipe passing through the outdoor unit, or a refrigerant pressure sensor for detecting the refrigerant pressure of the refrigerant pipe passing through the outdoor unit.

[0055] The outdoor unit of the air conditioner may include an outdoor unit communication unit. The outdoor unit communication unit may be configured to receive control signals from the control unit of the indoor unit of the air conditioner, which will be described later. Based on the control signals received through the outdoor unit communication unit, the outdoor unit may control the operation of the compressor, outdoor heat exchanger, expansion device, flow path switching valve, accumulator, or outdoor fan. The outdoor unit may transmit a sensing value detected by the outdoor unit sensor to the control unit of the indoor unit through the outdoor unit communication unit.

[0056] The indoor unit of an air conditioner may include a housing, a blower that circulates air inside or outside the housing, and an indoor heat exchanger that exchanges heat with the air flowing into the housing.

[0057] The housing may include an intake port. Indoor air can be drawn into the interior of the housing through the intake port.

[0058] The indoor unit of the air conditioner may include a filter configured to filter foreign substances in the air entering the housing through the intake port.

[0059] The housing may include an outlet. Air flowing inside the housing can be discharged to the outside of the housing through the outlet.

[0060] The housing of the indoor unit may be provided with an airflow guide that guides the direction of air discharged through the outlet. For example, the airflow guide may include a blade located above the outlet. For example, the airflow guide may include an auxiliary fan for controlling the discharge airflow. The airflow guide may be omitted, but is not limited thereto.

[0061] An indoor heat exchanger and a blower may be provided inside the housing of the indoor unit, positioned on the path connecting the intake and exhaust ports.

[0062] The blower may include an indoor fan and a fan motor. For example, the indoor fan may include an axial fan, a mixed-flow fan, a cross-flow fan, or a centrifugal fan.

[0063] The indoor heat exchanger may be positioned between the blower and the outlet, or between the intake and the blower. The indoor heat exchanger may absorb heat from the air entering through the intake or transfer heat to the air entering through the intake. The indoor heat exchanger may include heat exchange tubes through which refrigerant flows, and heat exchange fins in contact with the heat exchange tubes to increase the heat transfer surface area.

[0064] The indoor unit of the air conditioner may include a drain tray positioned below the indoor heat exchanger to collect condensate generated from the indoor heat exchanger. The condensate contained in the drain tray may be drained to the outside through a drain hose. The drain tray may be provided to support the indoor heat exchanger.

[0065] The indoor unit of the air conditioner may include an input interface. The input interface may include any type of user input means, including buttons, switches, touch screens, and / or touch pads. The user can directly input setting data (e.g., desired indoor temperature, setting of operating mode for cooling / heating / dehumidification / air purification, setting of outlet selection, and / or setting of airflow) through the input interface.

[0066] The input interface may be connected to an external input device. For example, the input interface may be electrically connected to a wired remote controller. The wired remote controller may be installed at a specific location within the indoor space (e.g., a part of a wall). The user can input setting data regarding the operation of the air conditioner by operating the wired remote controller. An electrical signal corresponding to the setting data obtained through the wired remote controller may be transmitted to the input interface. Additionally, the input interface may include an infrared sensor. The user can input setting data regarding the operation of the air conditioner remotely using a wireless remote controller. The setting data input through the wireless remote controller may be transmitted to the input interface as an infrared signal.

[0067] Additionally, the input interface may include a microphone. A user's voice command may be acquired through the microphone. The microphone may convert the user's voice command into an electrical signal and transmit the converted electrical signal to the indoor unit control unit. The indoor unit control unit may control the components of the air conditioner to execute functions corresponding to the user's voice command. Setting data acquired through the input interface (e.g., desired indoor temperature, operating mode settings for cooling / heating / dehumidification / air purification, outlet selection settings, and / or airflow settings) may be transmitted to the indoor unit control unit described later. In one example, the setting data acquired through the input interface may be transmitted externally, namely to an outdoor unit or a server, through the indoor unit communication unit described later.

[0068] The indoor unit of the air conditioner may include a power module. The power module can be connected to an external power source to supply power to the components of the indoor unit.

[0069] The indoor unit of an air conditioner may include an indoor unit sensor. The indoor unit sensor may be an environment sensor placed in a space inside or outside the housing. For example, the indoor unit sensor may include one or more temperature sensors and / or humidity sensors placed in a predetermined space inside or outside the housing of the indoor unit. For example, the indoor unit sensor may include a refrigerant temperature sensor for detecting the refrigerant temperature of a refrigerant pipe passing through the indoor unit. For example, the indoor unit sensor may include respective refrigerant temperature sensors for detecting the inlet, intermediate, and / or outlet temperatures of a refrigerant pipe passing through an indoor heat exchanger.

[0070] For example, each environmental information detected by the indoor unit sensor may be transmitted to the indoor unit control unit described later, or transmitted to the outside through the indoor unit communication unit described later.

[0071] The indoor unit of an air conditioner may include an indoor unit communication unit. The indoor unit communication unit may include at least one of a short-range communication module or a long-range communication module. The indoor unit communication unit may include at least one antenna for wirelessly communicating with another device. The outdoor unit may include an outdoor unit communication unit. The outdoor unit communication unit may also include at least one of a short-range communication module or a long-range communication module.

[0072] A short-range wireless communication module may include, but is not limited to, a Bluetooth communication module, a BLE (Bluetooth Low Energy) communication module, a Near Field Communication module, a WLAN (Wi-Fi) communication module, a Zigbee communication module, an infrared (IrDA, infrared Data Association) communication module, a WFD (Wi-Fi Direct) communication module, an UWB (ultrawideband) communication module, an Ant+ communication module, a microwave (uWave) communication module, etc.

[0073] The long-distance communication module may include a communication module that performs various types of long-distance communication and may include a mobile communication unit. The mobile communication unit transmits and receives wireless signals with at least one of a base station, an external terminal, and a server on a mobile communication network.

[0074] The indoor unit communication unit can communicate with external devices, such as servers, mobile devices, and other home appliances, through nearby access points (APs). The access point (AP) can connect the local area network (LAN) to which the air conditioner or user device is connected to the wide area network (WAN) to which the server is connected. The air conditioner or user device can be connected to the server through the wide area network (WAN). The indoor unit of the air conditioner may include an indoor unit control unit that controls the indoor unit's components, such as a blower. The outdoor unit of the air conditioner may include an outdoor unit control unit that controls the outdoor unit's components, such as a compressor. The indoor unit control unit can communicate with the outdoor unit control unit through the indoor unit communication unit and the outdoor unit communication unit. The outdoor unit communication unit can transmit control signals generated by the outdoor unit control unit to the indoor unit communication unit, or transmit control signals transmitted from the indoor unit communication unit to the outdoor unit control unit. In other words, the outdoor unit and the indoor unit can communicate bidirectionally. The outdoor unit and the indoor unit can transmit and receive various signals generated during the operation of the air conditioner.

[0075] The outdoor unit control unit can be electrically connected to the components of the outdoor unit and can control the operation of each component. For example, the outdoor unit control unit can adjust the frequency of the compressor and control the flow path switching valve to switch the direction of refrigerant circulation. The outdoor unit control unit can adjust the rotational speed of the outdoor fan. In addition, the outdoor unit control unit can generate a control signal to adjust the opening of the expansion valve. Under the control of the outdoor unit control unit, refrigerant can circulate along a refrigerant circulation circuit including a compressor, a flow path switching valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger.

[0076] Various temperature sensors included in the outdoor and indoor units can each transmit an electrical signal corresponding to the detected temperature to the outdoor unit control unit and / or the indoor unit control unit. For example, humidity sensors included in the outdoor and indoor units can each transmit an electrical signal corresponding to the detected humidity to the outdoor unit control unit and / or the indoor unit control unit.

[0077] The indoor unit control unit can acquire user input from a user device, including a mobile device, through the indoor unit communication unit, and can acquire user input directly or through a remote controller via an input interface. The indoor unit control unit can control the components of the indoor unit, including a blower, in response to the received user input. The indoor unit control unit can transmit information regarding the received user input to the outdoor unit control unit of the outdoor unit.

[0078] The outdoor unit control unit can control the components of the outdoor unit, including the compressor, based on information regarding user input received from the indoor unit. For example, when the outdoor unit control unit receives a control signal from the indoor unit corresponding to user input selecting an operation mode such as cooling operation, heating operation, fan operation, defrosting operation, or dehumidification operation, it can control the components of the outdoor unit so that the operation of the air conditioner corresponding to the selected operation mode is performed.

[0079] The outdoor unit control unit and the indoor unit control unit may each include a processor and a memory. The indoor unit control unit may include at least one first processor and at least one first memory, and the outdoor unit control unit may include at least one second processor and at least one second memory.

[0080] The memory can store / remember various information required for the operation of the air conditioner. The memory can store instructions, applications, data, and / or programs required for the operation of the air conditioner. For example, the memory can store various programs for the cooling operation, heating operation, dehumidification operation, and / or defrosting operation of the air conditioner. The memory may include volatile memory such as S-RAM (Static Random Access Memory) and D-RAM (Dynamic Random Access Memory) for temporarily storing data. Additionally, the memory may include non-volatile memory such as ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable Programmable Read Only Memory) for long-term data storage.

[0081] The processor can generate control signals to control the operation of the air conditioner based on instructions, applications, data, and / or programs stored in memory. As hardware, the processor may include logic circuits and arithmetic circuits. The processor can process data according to programs and / or instructions provided from memory and generate control signals according to the processing results. The memory and the processor may be implemented as a single control circuit or as multiple circuits.

[0082] The indoor unit of the air conditioner may include an output interface. The output interface is electrically connected to the indoor unit control unit and can output information related to the operation of the air conditioner under the control of the indoor unit control unit. For example, information such as the operating mode, airflow direction, airflow volume, and temperature selected by user input may be output. Additionally, the output interface may output sensing information obtained from the indoor unit sensor or the outdoor unit sensor, as well as warning / error messages.

[0083] The output interface may include a display and a speaker. The speaker can output various sounds as an acoustic device. The display may display information entered by the user or information provided to the user as various graphic elements. For example, operation information of the air conditioner may be displayed as at least one of an image or text. Additionally, the display may include an indicator that provides specific information. The display may include an LCD panel (Liquid Crystal Display Panel), an LED panel (Light Emitting Diode Panel), an OLED panel (Organic Light Emitting Diode Panel), a micro LED panel, and / or a plurality of LEDs.

[0084] When manufacturing a rotor for an electric motor, magnetized magnets can be assembled into the rotor's housing. In this case, assembling the magnets may be difficult due to their repulsive or attractive forces. Furthermore, these repulsive or attractive forces may cause the assembly position of the magnets to become unstable, potentially degrading the performance of the rotor and the motor employing it. In other words, when magnetized magnets are assembled into the rotor's housing, there is a risk that the manufacturability and performance of the rotor will be compromised.

[0085] The present disclosure aims to improve the manufacturability of the rotor manufacturing process and reduce or prevent performance degradation of the rocker when using a magnetized magnet. However, the technical problems to be solved by the present disclosure are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0086] Hereinafter, embodiments of the electric motor will be described with reference to the attached drawings.

[0087] FIG. 1 is a schematic cross-sectional view of an electric motor (1) according to one embodiment of the present disclosure. Referring to FIG. 1, the electric motor (1) may have a stator (20) that generates a rotating magnetic field and a rotor (10) that rotates by interaction with the rotating magnetic field. A shaft (30) is coupled to the rotor (10). The electric motor (1) may be, for example, a brushless motor, or a spoke-type IPM (Interior Permanent Magnet) motor in which a plurality of magnets (13) are radially embedded in the rotor (10). The electric motor (1) may further comprise a first bearing (41), a second bearing (42), a first metal plate (51), a second metal plate (52), a substrate (60), and a case (70).

[0088] The rotor (10) is positioned inside the stator (20) with an air gap between it and the stator (20). The rotor (10) is a component that rotates in the electric motor (1). The rotor (10) may include a rotor hub (11), a plurality of rotor cores (12), a plurality of magnets (13), and a resin molding part (14). The rotor hub (11) is an annular member located in the inner side in the radial direction of the rotor (10). Each of the plurality of rotor cores (12) is a radial member positioned outward in the radial direction from the rotor hub (11). Each of the plurality of magnets (13) is positioned radially opposite the stator (20) between a pair of adjacent rotor cores (12). FIG. 1 is a cross-sectional view of the electric motor (1) cut along a cross-section extending in the radial direction from the shaft (30) through the center of the rotor core (12), so the magnets (13) are not present in this cross-section. Accordingly, in FIG. 1, the magnet (13) is shown as a dashed line. The resin molding part (14) is a member integrally molded in resin together with the rotor hub (11), a plurality of rotor cores (12), and a plurality of magnets (13). A plurality of openings (15) are provided on at least one of the upper surface and the lower surface of the resin molding part (14). In this embodiment, a plurality of openings (15) are provided on the lower surface of the resin molding part (14).

[0089] The stator (20) generates a rotating magnetic field. The rotor (10) is rotated by the rotating magnetic field generated by the stator (20). The stator (20) may be provided with a back yoke (21), a plurality of teeth (22), and a winding (23). The back yoke (21) may be an annular member. Each of the plurality of teeth (22) protrudes radially inward from the back yoke (21). The winding (23) is wound around the plurality of teeth (22) with an insulator (24) in between. An insulator (24) is interposed between the winding (23) and the plurality of teeth (22). The stator (20) is molded into a roughly cylindrical shape using resin together with other members.

[0090] The shaft (30) is fixed to the rotor (10) and rotates together with the rotor (10). The shaft (30) is supported by a first bearing (41) and a second bearing (42). The first bearing (41) supports the upper portion of the shaft (30). The first bearing (41) is a cylindrical bearing having multiple balls. The second bearing (42) supports the lower portion of the shaft (30). The second bearing (42) is a cylindrical bearing having multiple balls.

[0091] The first metal plate (51) is a conductive member positioned near the top of the motor (1). The first metal plate (51) supports the first bearing (41). The shaft (30) protrudes upward from the first metal plate (51). The second metal plate (52) is a conductive member positioned at the bottom of the motor (1). The second metal plate (52) supports the second bearing (42). The outer diameter of the second metal plate (52) is equal to or larger than the outer diameter of the first metal plate (51). Thus, the first bearing (41) and the second bearing (42) are stably supported by the first and second metal plates (51)(52), respectively, allowing the shaft (30) to rotate stably.

[0092] A substrate (60) is placed inside the motor (1). A driving circuit (not shown) that outputs a driving signal to generate a rotating magnetic field in the winding (23) is mounted on the substrate (60). The substrate (60) is placed between the rotor (10), the stator (20), and the second metal plate (52). For example, the driving circuit may include an inverter circuit, etc., to apply voltage to the winding (23).

[0093] The case (70) accommodates the rotor (10), stator (20), first bearing (41), second bearing (42), and substrate (60) together with the first metal plate (51) and the second metal plate (52).

[0094] In the electric motor (1), when voltage is applied to the winding (23) from the driving circuit, current flows through the winding (23) and a rotating magnetic field is generated in the plurality of teeth (22). Depending on the polarity of the rotating magnetic field of the plurality of teeth (22) and the magnetic field of the plurality of magnets (13) facing it, an attractive force and a repulsive force are generated. Due to these attractive and repulsive forces, the rotor (10) rotates together with the shaft (30).

[0095] FIG. 2 is an exemplary perspective view of a rotor (10) of an electric motor (1) according to one embodiment of the present disclosure shown in FIG. 1. In FIG. 2, the rotor (10) is shown with the resin molding portion (14) removed.

[0096] Referring to FIG. 2, the rotor (10) comprises a rotor hub (11), a plurality of rotor cores (12), and a plurality of magnets (13). The rotor hub (11) and the plurality of rotor cores (12) are formed by stacking a plurality of electrical steel sheets in the axial direction. In some of the plurality of electrical steel sheets, the plurality of rotor cores (12) are connected to the rotor hub (11) by ribs. The plurality of rotor cores (12) are arranged spaced apart from each other in the circumferential direction, and a plurality of magnet housings (19) are formed between the plurality of rotor cores (12). A plurality of magnets (13) are housed in the plurality of magnet housings (19). The plurality of magnets (13) are arranged so that the opposing surfaces of two adjacent magnets (13) have the same magnetic pole. A magnetic flux of the same polarity as the magnetic poles of the opposing surfaces of the two magnets (13) flows through the magnetic pole of the rotor core (12) between the two adjacent magnets (13). The rotor (10) rotates relative to the stator (20) by repelling and attracting the magnetic flux of the magnetic poles of each rotor core (12) with respect to the rotating magnetic field of the stator (20) (see FIG. 1). The rotor (10) according to one embodiment of the present disclosure illustrated in FIG. 2 is a 14-pole rotor (10) having 14 rotor cores (12) and 14 magnets (13).

[0097] In a spoke-type IPM motor, the effective magnetic flux can be significantly increased by increasing the number of poles, that is, by increasing the number of poles. In addition, to increase the effective magnetic force by reducing the magnetic flux leaking toward the inner diameter side, that is, toward the rotor hub (11), the rotor core (12) and the rotor hub (11) can be integrated using a resin molding part (14) without connecting the rotor core (12) to the rotor hub (11).

[0098] However, in the case of multi-polarization, for example, when the rotor (10) is made 14-polarized as shown in FIG. 2, the area of ​​the rotor core (12) existing between two adjacent magnets (13) becomes smaller. Therefore, in the combined magnetization method in which the unmagnetized magnet (13) is magnetized while assembled in the magnet housing (19), the magnetization may be insufficient and the performance of the motor (1) may be degraded.

[0099] Therefore, a method is being considered to magnetize only the magnets (13) in advance and to assemble the magnetized multiple magnets (13) into the multiple magnet housing (19). However, in a spoke-type IPM motor, since two adjacent magnets (13) are arranged so that the same magnetic poles face each other, when assembling the magnetized multiple magnets (13) into the multiple magnet housing (19), the adjacent magnets (13) repel each other. As a result, the position of the multiple magnets (13) becomes unstable, which may reduce manufacturability. In addition, due to the magnetic flux deviation between the magnetic poles caused by the misalignment of the positions of the multiple magnets (13), an increase in noise or a decrease in efficiency of the motor (1) may occur.

[0100] In the present disclosure, the positions of a plurality of magnets (13) are stabilized by determining the positions of the plurality of magnets (13) using magnetic force. In addition, the deviation of magnetic flux due to misalignment of the positions of the plurality of magnets (13) is suppressed. By doing so, the manufacturability of the electric motor (1) is improved, noise is reduced, and efficiency is improved.

[0101] FIGS. 3A and FIGS. 3B are drawings showing an example of a method for determining the position of a magnet (13). FIGS. 3A and FIGS. 3B have a magnet support (85) added below the AA cross-section of FIG. 2.

[0102] Referring to FIGS. 3a and 3b, a magnet (13) is inserted into a magnet housing (19) between two adjacent rotor cores (12). The magnet (13) is axially supported by a magnet support (85). The magnet support (85) is a magnetic material. The magnet support (85) is a component provided in the lower mold (82) of a molding die described later. With this configuration, the magnetic flux (B) of the magnet (13) is intentionally passed through the magnet support (85) to generate an axial magnetic attraction force (M1) and a circumferential magnetic attraction force (M2).

[0103] The axial magnetic attraction force (M1) is generated by passing a magnetic flux (B) through a magnet support (85) that supports the magnet (13) in the axial direction. If only the axial magnetic attraction force (M1) is generated, there is no need to deviate the geometric center (W) of the magnet support (85) with respect to the center (Cs) of the magnet housing (19). However, it is necessary to design the area of ​​the magnet support (85) so that the axial magnetic attraction force (M1) becomes much greater than the repulsive force between two adjacent magnets (13).

[0104] The magnetic attraction force (M2) in the circumferential direction is generated by deviating the geometric center (W) of the magnet support (85) with respect to the center (Cs) of the magnet storage (19). The magnetic attraction force (M2) is generated in the direction in which the geometric center (W) of the magnet support (85) is deviated with respect to the center (Cs) of the magnet storage (19).

[0105] In FIG. 3a, the center (Cm) of the magnet (13) coincides with the center (Cs) of the magnet housing (19). In contrast, in FIG. 3b, the center (Cm) of the magnet (13) is offset from the center (Cs) of the magnet housing (19) by the magnetic attraction force (M2) in the direction of deviation. The circumferential position of the magnet (13) is determined by contacting the rotor core (12).

[0106] With this configuration, the position of the magnet (13) can be stabilized within the molding die during the process of forming the resin molding part (14) without adding a part for position determination to the rotor (10) itself. Therefore, the manufacturability of the rotor (10) can be improved. In addition, since the magnet support part (85) is a part of the lower mold (82) described later, it is separated from the rotor (10) after the resin molding part (14) is formed. That is, the magnet support part (85) is not a component of the rotor (10). Therefore, there is no magnetic flux leakage of the rotor (10) caused by the magnet support part (85) and no reduction in magnetic force of the rotor (10) caused by this. Furthermore, since the position of all magnets (13) housed in the rotor (10) can be determined, the magnetic flux imbalance of the rotor (10) can be suppressed, and thereby the performance of the motor (1) can be improved and noise reduced.

[0107] In a rotor (10) manufactured by the manufacturing method described above, a plurality of openings (15) are formed on one surface of a resin molding part (14) by a plurality of magnet support parts (85). The shape of the openings (15) is complementary to the shape of the magnet support parts (85). Each of the plurality of openings (15) overlaps with at least one of the plurality of magnet housing parts (19). The geometric center of the plurality of openings (15) is the same as the geometric center of the magnet support part (85). Accordingly, the geometric center (W) of the plurality of openings (15) is deviated in the circumferential direction with respect to the centrifugal centerline (Cs) of the corresponding magnet housing part among the plurality of magnet housing parts (19). According to this, in each of the plurality of magnet storage portions (19) and each of the plurality of corresponding openings (15), the distance between the magnet (13) stored in the magnet storage portion (19) and the two rotor cores (12) forming the magnet storage portion (19) is narrower in the direction of deviation of the geometric center of the corresponding opening (15) than in the opposite direction.

[0108] Hereinafter, various forms and arrangements of a plurality of magnet support members (85) and various embodiments of a method for manufacturing a rotor (10) according to the same are described.

[0109] In a first embodiment, a single magnet (13) is axially supported by a plurality of, for example, two, magnet supports (85) spaced apart in the centrifugal direction, i.e., the diameter direction, and each magnet support (85) may be arranged to deflect the magnet (13) in different directions, for example, opposite directions, on the inner and outer sides. Each magnet support (85) may support two magnets (13) adjacent to each other in the circumferential direction. For example, within an injection molding die (Fig. 7: 80), a plate-shaped magnet support (85) made of a magnetic material is arranged to span two adjacent magnet housings (19). At this time, the magnet support (85) is arranged within the injection molding die (Fig. 7: 80) such that the geometric centers of the two parts into which the magnet support (85) is divided in the circumferential direction are deflected with respect to the circumferential centerlines of the two magnet housings (19). In this state, the magnet (13) that has been magnetized is inserted into the magnet storage part (19). Then, the axial displacement of the magnet (13) is prevented by the axial magnetic attraction force within the injection molding mold (Fig. 7:80), and the circumferential position of the magnet (13) is determined by the circumferential magnetic attraction force, that is, the deviation direction.

[0110] FIGS. 4 to 8 are drawings illustrating a method for manufacturing a rotor (10) according to an embodiment of the present disclosure. FIG. 4 shows an example of a lower mold (82) in a method for manufacturing a rotor according to an embodiment of the present disclosure. FIG. 5 shows a rotor intermediate body arranged in the lower mold (82) having a plurality of magnet housings (19) provided therein in a method for manufacturing a rotor according to an embodiment of the present disclosure. FIG. 6 shows a plurality of magnets (13) arranged in the plurality of magnet housings (19) in a method for manufacturing a rotor according to an embodiment of the present disclosure. FIG. 7 shows an upper mold (81) combined with a lower mold (82) in a method for manufacturing a rotor according to an embodiment of the present disclosure. FIG. 8 shows the upper mold (81) separated after resin molding.

[0111] First (first process), a lower mold (82) is prepared as shown in FIG. 4. The lower mold (82) may be equipped with a base portion (84), a plurality of magnet support portions (85), a rotor hub pin (86), and a plurality of rotor core pins (87). The base portion (84) is a portion that fits with the upper mold (Fig. 7: 81) (described later). The magnet support portion (85) is placed in the base portion (84) so ​​as to span two adjacent magnet housing portions (19). At this time, the magnet support portion (85) is placed in the base portion (84) such that the geometric centers of the two parts into which the magnet support portion (85) is divided in the circumferential direction are each deviated in opposite directions with respect to the circumferential centerlines of the two magnet housing portions (19). Additionally, two magnet support portions (85) are placed spaced apart in the centrifugal direction, that is, the diameter direction, for one magnet housing portion (19). At this time, two magnet support members (85) are arranged to be deviated in different directions, that is, opposite directions, from the inner and outer sides with respect to one magnet storage member (19). The rotor hub pin (86) is a pin for fixing the rotor hub (11). The plurality of rotor core pins (87) are pins for determining the phase of the rotor (10) by fixing the plurality of rotor cores (12).

[0112] Next (second process), as illustrated in FIG. 5, a rotor hub (11) and a plurality of rotor cores (12) are set in a lower mold (82). Specifically, the rotor hub (11) is fixed to the lower mold (82) by inserting a rotor hub pin (86) into the hollow portion in the center of the rotor hub (11). Additionally, a plurality of rotor core pins (87) (not shown) are fixed to the lower mold (82) by inserting a plurality of rotor core pins (87) (not shown) into the concave portion (not shown) on the lower surface of the plurality of rotor cores (12).

[0113] Next (third process), as shown in FIG. 6, a plurality of magnets (13) are inserted into a plurality of magnet housings (19) between a plurality of rotor cores (12). At this time, the position of the magnets (13) is fixed by the magnetic force of the magnets (13), that is, by the axial magnetic attraction force (M1) and the circumferential magnetic attraction force (M2) generated by the magnetic flux of the magnets (13) passing through the magnet support (85) arranged as described above.

[0114] Next (4th process), as shown in FIG. 7, the upper mold (81) and the lower mold (82) are joined together to close the mold. Thus, the upper mold (81) and the lower mold (82) form an injection molding mold (80). In this state, resin is injected into the injection molding mold (80) by injection molding and solidified.

[0115] Next (5th process), as shown in FIG. 8, the mold is opened by raising the upper mold (81) relative to the lower mold (82), and the rotor (101), in which the rotor hub (11), a plurality of rotor cores (12), and a plurality of magnets (13) are integrated by the resin molding part (141), is removed from the lower mold (82).

[0116] FIG. 9 is a perspective view of a rotor (101) manufactured by the manufacturing method according to the first embodiment. FIG. 9 is a perspective view of the rotor (101) in an inverted state after being ejected from the lower mold (82).

[0117] In the rotor (101) manufactured by the manufacturing method according to the first embodiment of the present disclosure, as shown in FIG. 9, a plurality of magnetic openings (151) are formed on the lower surface of the resin molding part (141). A portion of the magnet (13) is exposed through the magnetic openings (151). The plurality of magnetic openings (151) are formed by a plurality of magnetic support parts (85). Additionally, a rotor hub opening (161) and a plurality of rotor core openings (171) are also formed in the resin molding part (141). The rotor hub opening (161) is an opening into which a rotor hub pin (86) was inserted, and a shaft (30) is inserted into the rotor hub opening (161). The rotor core opening (171) is an opening into which a rotor core pin (87) was inserted.

[0118] In the rotor (101) according to the present embodiment, two magnet openings (151) are overlapped for each of the plurality of magnet housings (19). The plurality of magnet openings (151) are examples of first openings that extend in a circumferential direction so as to overlap at least a portion with two adjacent magnet housings (19).

[0119] FIG. 10 is a partial rear view of a rotor (101) manufactured by the manufacturing method according to the first embodiment.

[0120] Referring to FIG. 10, the magnet housing (19a, 19b) and the magnet (13a, 13b) are located inside the resin molding part (141) and are therefore shown in silver lines. The resin molding part (141) has magnet openings (151a~151c) and a rotor core opening (171) formed therein.

[0121] At least a portion of the counterclockwise half of the magnet opening (151a) overlaps with the outer circumference portion of the magnet housing (19a). The geometric center (W12a) of the counterclockwise half of the magnet opening (151a) is offset in a clockwise offset direction (E12a) with respect to the centerline (Csa) of the magnet housing (19a). Thus, the magnet (13a) is placed in the magnet housing (19a) with its outer circumference portion offset in the offset direction (E12a). In this case, the gap between the two rotor cores (12) and the magnet (13a) with the magnet housing (19a) in between becomes narrower in the offset direction (E12a) than in the opposite direction (E12a).

[0122] At least a portion of the clockwise half of the magnet opening (151b) overlaps with the inner circumferential portion of the magnet housing (19a). The geometric center (first geometric center) (W11b) of the clockwise half of the magnet opening (151b) (first half) is deviated in a counterclockwise direction of deviation (E11b) with respect to the centerline (Csa) of the magnet housing (19a). Thus, the magnet (13a) is placed in the magnet housing (19a) with its inner circumferential portion deviated in the direction of deviation (E11b). In this case, the gap between the two rotor cores (12) and the magnet (13a) with the magnet housing (19a) in between becomes narrower in the direction of deviation (E11b) than in the opposite direction of deviation (E11b).

[0123] The counterclockwise half of the magnet opening (151b) overlaps, at least in part, with the inner circumferential portion of the magnet housing (19b) adjacent to the magnet housing (19a). The geometric center (second geometric center) (W12b) of the counterclockwise half (second half portion) of the magnet opening (151b) is deviated in a clockwise direction of deviation (E12b) with respect to the centerline (Csb) of the magnet housing (19b). Thus, the magnet (13b) is placed in the magnet housing (19b) with its inner circumferential portion deviated in the direction of deviation (E12b). In this case, the gap between the two rotor cores (12) and the magnet (13b) with the magnet housing (19b) in between becomes narrower in the direction of deviation (E12b) than on the opposite side of the direction of deviation (E12b).

[0124] At least a portion of the clockwise half of the magnet opening (151c) overlaps with the outer circumference portion of the magnet housing (19b). The geometric center (first geometric center) (W11c) of the clockwise half of the magnet opening (151c) is deviated in a counterclockwise direction of deviation (E11c) with respect to the centerline (Csb) of the magnet housing (19b). Thus, the magnet (13b) is placed in the magnet housing (19b) with its outer circumference portion deviated in the direction of deviation (E11c). In this case, the gap between the magnet (13b) and the two rotor cores (12) and the magnet (13b) between the magnet (13b) and the magnet housing (19b) becomes narrower in the direction of deviation (E11c) than in the opposite direction of deviation (E11c).

[0125] At least a portion of the counterclockwise half of the magnet opening (151c) overlaps with the outer periphery portion of the magnet housing (19c). The geometric center (W12c) of the counterclockwise half of the magnet opening (151c) is offset in a clockwise direction of deviation (E12c) with respect to the centerline (Csc) of the magnet housing (19c). Thus, the magnet (13c) is placed in the magnet housing (19c) with its outer periphery portion offset in the direction of deviation (E12c).

[0126] The magnet storage sections (19a) and (19b) are examples of first and second magnet storage sections adjacent to each other. The magnet storage section (19c) is an example of a third magnet storage section adjacent to the second magnet storage section on the opposite side of the first magnet storage section with respect to the second magnet storage section. The magnet opening (151b) is an example of an inner circumferential opening that overlaps with the first and second magnet storage sections adjacent to each other. The magnet opening (151c) is an example of an outer circumferential opening that overlaps with the second and third magnet storage sections adjacent to each other and is spaced outward from the inner circumferential opening. Accordingly, the direction of deviation with respect to the centerline of the second magnet storage section at the geometric center of the half portion where the inner circumferential opening overlaps with the second magnet storage section is the opposite direction of the direction of deviation with respect to the centerline of the second magnet storage section at the geometric center of the half portion where the outer circumferential opening overlaps with the second magnet storage section.

[0127] With this configuration, the area of ​​the region containing the rotor core (12) between two adjacent magnets (13) can be approximately the same for all two adjacent magnets (13). As a result, the imbalance of magnetic flux of multiple rotor cores (12) can be suppressed.

[0128] In addition, according to the manufacturing method of the first embodiment of the present disclosure, the manufacturability and performance of the motor (1) manufactured using a plurality of magnets (13) that have been magnetized can be improved. Furthermore, by using a plate-type magnet support (85), the number of parts of the motor (1) can be reduced. Moreover, the gap between the magnet opening (151) and the rotor core opening (171) can be secured, thereby facilitating the manufacturing of the rotor (10) and suppressing the reduction in strength of the rotor (10).

[0129] As a second embodiment of the manufacturing method, a single magnet (13) is supported axially by a single magnet support (85), so that all of the multiple magnets (13) can be deviated in the same direction in the circumferential direction. For example, a magnet support (85) made of a magnetic material is placed within an injection molding mold (80) such that its geometric center is deviated relative to the centerline of the magnet housing (19). The magnet support (85) is in the form of a plate extending in the centrifugal direction, that is, in the diameter direction. In this state, the magnet (13) that has been magnetized is inserted into the magnet housing (19). Then, a magnetic attraction force is generated between the magnet (13) and the magnet support (85) by the magnetic force of the magnet support (85). Then, within the injection molding mold (80), the axial deviation of the magnet (13) is prevented by the axial magnetic attraction force, and the circumferential position of the magnet (13) is determined by the magnetic attraction force in the circumferential direction, that is, the direction of deviation.

[0130] The manufacturing process is the same as that illustrated in FIGS. 4 to 8. However, in FIG. 4, a plurality of magnet support members (85) are arranged to correspond to each of a plurality of magnet storage members (19). Each of the plurality of magnet support members (85) is in the form of a plate extended in the centrifugal direction, and its geometric center is arranged to be offset in the circumferential direction with respect to the centerline of the corresponding magnet storage member (19). The offset directions of the plurality of magnet support members (85) are all the same.

[0131] FIG. 11 is a perspective view of a rotor (102) manufactured by a manufacturing method according to a second embodiment of the present disclosure. FIG. 11 is a perspective view of a rotor (102) in an inverted state after being ejected from a lower mold (82).

[0132] As illustrated in FIG. 11, a plurality of magnetic openings (152) are formed on the lower surface of the resin molding part (142). A portion of the magnet (13) is exposed through the magnetic openings (152). A single magnetic opening (152) extending in the centrifugal direction is formed corresponding to one magnet (13). The plurality of magnetic openings (152) are formed by a plurality of magnetic support parts (85). In the rotor (102) according to the present embodiment, the plurality of magnetic openings (152) and the plurality of magnetic housing parts (19) correspond one-to-one. Additionally, a rotor hub opening (162) and a plurality of rotor core openings (172) are also formed in the resin molding part (142). The rotor hub opening (162) is an opening into which a rotor hub pin (86) was inserted, and a shaft (30) is inserted into the rotor hub opening (162). The rotor core opening (172) is the opening into which the rotor core pin (87) was inserted.

[0133] In the rotor (102) according to the present embodiment, a plurality of magnet openings (152) and a plurality of magnet housings (19) correspond one-to-one. Each of the plurality of magnet openings (152) is extended in the direction of the centerline of the corresponding magnet housing (19).

[0134] FIG. 12 is a partial rear view of a rotor (102) manufactured by the manufacturing method according to the second embodiment.

[0135] Referring to FIG. 12, the magnet housing (19a, 19b) and the magnet (13a, 13b) are located inside the resin molding part (142) and are therefore shown in silver lines. Magnet openings (152a, 152b) are formed in the resin molding part (142).

[0136] The geometric center (W2a) of the magnet opening (152a) is deviated in a counterclockwise direction of deviation (E2a) with respect to the centerline (Csa) of the corresponding magnet housing (19a). As a result, the magnet (13a) is deviated in the direction of deviation (E2a) and placed in the magnet housing (19a). In this case, the distance between the two rotor cores (12) and the magnet (13a) with the magnet housing (19a) in between becomes narrower in the direction of deviation (E2a) than in the opposite direction of deviation (E2a).

[0137] The geometric center (W2b) of the magnet opening (152b) is deviated in a counterclockwise direction (E2b) with respect to the centerline (Csb) of the corresponding magnet housing (19b). As a result, the magnet (13b) is deviated in the direction of deviation (E2b) and placed in the magnet housing (19b). In this case, the gap between the two rotor cores (12) and the magnet (13b) with the magnet housing (19b) in between becomes narrower in the direction of deviation (E2b) than in the opposite direction of deviation (E2b).

[0138] With this configuration, the area of ​​the region containing the rotor core (12) between two adjacent magnets (13) can be approximately the same for all two adjacent magnets (13). As a result, the imbalance of magnetic flux of multiple rotor cores (12) can be suppressed.

[0139] In the above-described embodiment, all magnets (13) are deviated in the same direction in the circumferential direction, for example, counterclockwise, but some magnets (13) may be deviated in a different direction from the other magnets (13), for example, clockwise. For example, two adjacent magnets (13) may be deviated in opposite directions in the circumferential direction. A plurality of magnet supports (85) may be placed within an injection molding die (80) according to the deviated arrangement of the plurality of magnets (13).

[0140] According to the manufacturing method of the second embodiment of the present disclosure, the manufacturability and performance of the motor (1) manufactured using a plurality of magnets (13) that have been magnetized can be improved. In addition, the number of parts of the motor (1) can be reduced by using a plate-type magnet support (85).

[0141] In a manufacturing method according to the third embodiment of the present disclosure, a single magnet (13) is supported by a plurality of magnet supports (85), for example, two magnet supports, which are spaced apart in the centrifugal direction, i.e., the diameter direction, so that all magnets (13) can be deviated in the same direction in the circumferential direction.

[0142] For example, a plurality of, for example, two pin-shaped magnet supports (85) made of a magnetic material are placed in an injection molding mold (80) such that their geometric centers are deviated in the same direction in the circumferential direction with respect to the centerline of the corresponding magnet housing (19). In this state, a magnet (13) that has been magnetized is inserted into the magnet housing (19). Then, within the injection molding mold (80), a magnetic attraction force is generated between the magnet (13) and the two magnet supports (85) by the magnetic force of the two magnet supports (85). The axial magnetic attraction force prevents the magnet (13) from moving out in the axial direction, and the circumferential position of the magnet (13) is determined by the magnetic attraction force in the direction of deviation.

[0143] The manufacturing process is the same as that shown in FIGS. 4 to 8. However, in FIG. 4, two pin-shaped magnet supports (85) are arranged spaced apart in the centrifugal direction for each of the plurality of magnet storage portions (19). The two pin-shaped magnet supports (85) are arranged so that their geometric centers are offset in the same direction in the circumferential direction with respect to the centerline of the corresponding magnet storage portion (19).

[0144] FIG. 13 is a perspective view of a rotor (103) manufactured by a manufacturing method according to the third embodiment of the present disclosure. FIG. 13 is a perspective view of the rotor (103) in an inverted state after being ejected from the lower mold (82). As shown in FIG. 13, a plurality of magnetic openings (153) are formed on the lower surface of the resin molding part (143). A portion of the magnet (13) is exposed through the plurality of magnetic openings (153). Two magnetic openings (153) are formed spaced apart in the centrifugal direction corresponding to one magnet (13). However, this is not limited thereto, and three or more magnetic openings (153) may be formed on one magnet (13). In addition, a rotor hub opening (163) and a plurality of rotor core openings (173) are also formed in the resin molding part (143). The rotor hub opening (163) is an opening into which the rotor hub pin (86) was inserted, and the shaft (30) is inserted into the rotor hub opening (163). The plurality of rotor core openings (173) are openings into which the rotor core pin (87) was inserted.

[0145] In the rotor (103) of the present embodiment, two magnetic openings (153) are superimposed for each of the plurality of magnetic housings (19). The plurality of magnetic openings (153) are pinhole-shaped. The pinholes do not necessarily have to be circular.

[0146] FIG. 14 is a partial rear view of a rotor (103) manufactured by the manufacturing method according to the third embodiment. FIG. 14 is a perspective view of the rotor (103) in an inverted state after being ejected from the lower mold (82). Referring to FIG. 14, the magnet housing (19a, 19b) and the magnet (13a, 13b) are shown in silver lines as they exist inside the resin molding part (143). Magnet openings (153a~153d) are formed in the resin molding part (143).

[0147] The magnet opening (153a) and the magnet opening (153c) are spaced apart from each other in the centrifugal direction and correspond to the magnet housing (19a), that is, the magnet (13a). The geometric center (W3a) of the magnet opening (153a) located on the outer side of the magnet housing (19a) is deviated in a counterclockwise direction of deviation (E3a) with respect to the centerline (Csa) of the magnet housing (19a). The geometric center (W3c) of the magnet opening (153c) located on the inner side of the magnet housing (19a) is deviated in a counterclockwise direction of deviation (E3c) with respect to the centerline (Csa) of the magnet housing (19a). Thus, the magnet (13a) is deviated in the direction of deviation (E3a) and the direction of deviation (E3c) and is placed in the magnet housing (19a). In this case, the gap between the two rotor cores (12) and the magnet (13a) with the magnet housing (19a) in between is narrower in the direction of deviation (E3a)(E3c) than in the opposite direction of deviation (E3a)(E3c).

[0148] The magnet opening (153b) and the magnet opening (153d) are spaced apart from each other in the centrifugal direction and correspond to the magnet housing (19b), that is, the magnet (13b). The geometric center (W3b) of the magnet opening (153b) located on the outer side of the magnet housing (19b) is deviated in a counterclockwise direction of deviation (E3b) with respect to the centerline (Csb) of the magnet housing (19b). The geometric center (W3d) of the magnet opening (153d) located on the inner side of the magnet housing (19b) is deviated in a counterclockwise direction of deviation (E3d) with respect to the centerline (Csb) of the magnet housing (19b). Thus, the magnet (13b) is deviated in the direction of deviation (E3b) (E3d) and placed in the magnet housing (19b). In this case, the gap between the two rotor cores (12) and the magnet (13b) with the magnet housing (19b) in between is narrower in the direction of deviation (E3b)(E3d) than in the opposite direction of deviation (E3b)(E3d).

[0149] The magnetic opening (153c) (153d) is an example of an inner opening that overlaps the corresponding magnetic opening on the inner side. The magnetic opening (153a) (153b) is an example of an outer opening that overlaps the corresponding magnetic opening on the outer side. Accordingly, the geometric centers of the inner opening and the outer opening are deviated in the same direction in the circumferential direction with respect to the centerline of the corresponding magnetic opening.

[0150] With this configuration, the area of ​​the region containing the rotor core (12) between two adjacent magnets (13) can be approximately the same for all two adjacent magnets (13). As a result, the imbalance of magnetic flux in multiple rotor cores (12) can be suppressed. In the above-described embodiment, all magnets (13) are deviated in the same direction in the circumferential direction, for example, counterclockwise, but some magnets (13) may be deviated in a different direction from the other magnets (13), for example, clockwise. For example, two adjacent magnets (13) may be deviated in opposite directions. Multiple magnet supports (85) can be placed within an injection molding die (80) according to the deviated arrangement of multiple magnets (13).

[0151] According to the manufacturing method of the third embodiment of the present disclosure, the manufacturability and performance of the electric motor (1) manufactured using a plurality of magnets (13) that have been magnetized can be improved. In addition, the manufacturing of mold parts is facilitated by using a pin-shaped magnet support (85). Furthermore, by supporting a single magnet (13) with a plurality of magnet support (85), the position of the magnet (13) can be stably preserved and maintained during the injection molding process.

[0152] As a fourth embodiment of the manufacturing method, a single magnet (13) is axially supported by a plurality of magnet support members (85) spaced apart in the centrifugal direction, i.e., the diameter direction, for example, two magnet support members (85), so that a plurality of magnets (13) can be deviated in different directions, for example, opposite directions, in the circumferential direction on the inner side and the outer side.

[0153] For example, a plurality of, for example, two pin-shaped magnet supports (85) made of a magnetic material are arranged in an injection molding mold (80) such that their geometric centers are deviated in opposite directions in the circumferential direction with respect to the centerline of the magnet housing (19) corresponding thereto. In this state, a magnet (13) that has been magnetized is inserted into the magnet housing (19). Then, within the injection molding mold (80), a magnetic attraction force is generated between the magnet (13) and the two magnet supports (85) by the magnetic force of the two magnet supports (85). The axial magnetic attraction force prevents the magnet (13) from moving out in the axial direction, and the circumferential position of the magnet (13) is determined by the magnetic attraction force in the direction of deviation.

[0154] The manufacturing process is the same as that illustrated in FIGS. 4 to 8. However, in FIG. 4, two pin-shaped magnet supports (85) spaced apart in the centrifugal direction are arranged for each of the plurality of magnet storage portions (19). The two pin-shaped magnet supports (85) have their geometric centers in different directions, for example, opposite directions, in the circumferential direction from the inner and outer sides with respect to the centerline of the corresponding magnet storage portion (19).

[0155] FIG. 15 is a perspective view of a rotor (104) manufactured by a manufacturing method according to the fourth embodiment of the present disclosure. FIG. 15 is a perspective view of the rotor (104) in an inverted state after being ejected from the lower mold (82). As shown in FIG. 15, a plurality of magnetic openings (154) are formed on the lower surface of the resin molding part (144). A portion of the magnet (13) is exposed through the plurality of magnetic openings (154). Two magnetic openings (154) are formed spaced apart in the centrifugal direction corresponding to one magnet (13). However, this is not limited thereto, and three or more magnetic openings (154) may be formed on one magnet (13). In addition, a rotor hub opening (164) and a plurality of rotor core openings (174) are also formed in the resin molding part (144). The rotor hub opening (164) is an opening into which the rotor hub pin (86) was inserted, and the shaft (30) is inserted into the rotor hub opening (164). The rotor core opening (174) is an opening into which the rotor core pin (87) was inserted.

[0156] In the rotor (104) of the present embodiment, two magnetic openings (154) are superimposed for each of the plurality of magnetic housings (19). The plurality of magnetic openings (154) are pinhole-shaped. The pinholes do not necessarily have to be circular.

[0157] FIG. 16 is a partial rear view of a rotor (104) manufactured by the manufacturing method according to the fourth embodiment. FIG. 16 is a perspective view of a rotor (103) in an inverted state after being ejected from a lower mold (82). Referring to FIG. 16, the magnet housing (19a, 19b) and the magnet (13a, 13b) are shown in silver lines as they exist inside the resin molding part (144). Magnet openings (154a to 154d) are formed in the resin molding part (144).

[0158] The magnet opening (154a) and the magnet opening (154c) are spaced apart from each other in the centrifugal direction and correspond to the magnet housing (19a), that is, the magnet (13a). The geometric center (W4a) of the magnet opening (154a) located on the outer side of the magnet housing (19a) is deviated in a clockwise direction of deviation (E4a) with respect to the center line (Csa) of the magnet housing (19a). The geometric center (W4c) of the magnet opening (154c) located on the outer side of the magnet housing (19a) is deviated in a counterclockwise direction of deviation (E4c) with respect to the center line (Csa) of the magnet housing (19a). Thus, the magnet (13a) is placed in the magnet housing (19a) with its outer side deviated in the direction of deviation (E4a) and its inner side deviated in the direction of deviation (E4c). In this case, the gap between the two rotor cores (12) and the magnet (13a) with the magnet housing (19a) in between is narrower on the outer side in the direction of deviation (E4a) than on the opposite side in the direction of deviation (E4a), and on the inner side in the direction of deviation (E4c) than on the opposite side in the direction of deviation (E4c).

[0159] The magnet opening (154b) and the magnet opening (154d) are spaced apart from each other in the centrifugal direction and correspond to the magnet housing (19b), that is, the magnet (13b). The geometric center (W4b) of the magnet opening (154b) located on the outer side of the magnet housing (19b) is deviated in a counterclockwise direction (E4b) with respect to the centerline (Csb) of the magnet housing (19b). The geometric center (W4d) of the magnet opening (154d) located on the inner side of the magnet housing (19b) is deviated in a clockwise direction (E4d) with respect to the centerline (Csb) of the magnet housing (19b). Thus, the magnet (13b) is positioned in the magnet housing (19b) with its outer side deviated in the direction of deviation (E4b) and its inner side deviated in the direction of deviation (E4d). In this case, the gap between the two rotor cores (12) and the magnet (13b) with the magnet housing (19b) in between is narrower on the outer side in the direction of deviation (E4b) than on the side opposite to the direction of deviation (E4b), and on the inner side in the direction of deviation (E4d) than on the side opposite to the direction of deviation (E4d).

[0160] The magnetic openings (154c) and (154d) are examples of inner openings that overlap with the corresponding magnetic openings on the inner side. The magnetic openings (154a) and (154b) are examples of outer openings that overlap with the corresponding magnetic openings on the outer side. Accordingly, the geometric centers of the inner openings and outer openings are deviated in opposite directions in the circumferential direction with respect to the centerline of the corresponding magnetic openings.

[0161] With this configuration, the area of ​​the region containing the rotor core (12) between two adjacent magnets (13) can be approximately the same for all two adjacent magnets (13). As a result, the imbalance of magnetic flux in multiple rotor cores (12) can be suppressed. In the above-described embodiment, all magnets (13) are deviated in different directions in the circumferential direction on the inner side and the outer side, but some magnets (13) may be deviated in the same direction in the circumferential direction. Multiple magnet support members (85) can be placed in an injection molding die (80) according to the deviated arrangement of multiple magnets (13).

[0162] According to the manufacturing method of the fourth embodiment, the manufacturability and performance of the electric motor (1) manufactured using the magnetized magnet (13) can be improved. In addition, the manufacturing of mold parts is facilitated by using the pin-shaped magnet support (85). Furthermore, by supporting a single magnet (13) with a plurality of magnet support (85), the position of the magnet (13) can be stably preserved and maintained during the injection molding process.

[0163] In the embodiments described above, the shape of the magnetic opening (15) is approximately spherical or oblong, but is not limited thereto and may have other shapes. Also, in the embodiments described above, the magnetic support member (85) supports the magnet (13) from the lower surface of the resin molding member (14) so ​​that the magnetic opening (15) is formed on the lower surface of the resin molding member (14), but is not limited thereto. For example, the magnetic support member (85) may support the magnet (13) from the upper surface of the resin molding member (14) so ​​that the magnetic opening (15) is formed on the upper surface of the resin molding member (14). In other words, the magnetic opening (15) may be formed on at least one of the upper surface and the lower surface of the resin molding member (14).

[0164] FIG. 17 is a schematic diagram of an embodiment of an air conditioner according to the present disclosure. Referring to FIG. 17, the air conditioner may have an indoor unit (2001) and an outdoor unit (2002). The indoor unit (2001) may include an indoor heat exchanger (201). The outdoor unit (2002) may include an outdoor heat exchanger (203), a fan (205) that generates a flow of air passing through the outdoor heat exchanger (203), and an electric motor (206) that rotates the fan (205).

[0165] The indoor heat exchanger (201) can perform heat exchange between the refrigerant and the indoor air by utilizing the phase change of the refrigerant (e.g., evaporation or condensation). For example, while the refrigerant evaporates in the indoor heat exchanger (201), the refrigerant can absorb heat from the indoor air, and the indoor air can be cooled by blowing the cooled indoor air through the cooled indoor heat exchanger (201). Additionally, while the refrigerant condenses in the indoor heat exchanger (201), the refrigerant can release heat to the indoor air, and the indoor air can be heated by blowing the heated indoor air through the high-temperature indoor heat exchanger (201).

[0166] The outdoor heat exchanger (203) can perform heat exchange between the refrigerant and the outdoor air by utilizing the phase change of the refrigerant (e.g., evaporation or condensation). For example, while the refrigerant is condensing in the outdoor heat exchanger (203), the refrigerant releases heat to the outdoor air, and while the refrigerant flowing through the outdoor heat exchanger (203) is evaporating, the refrigerant can absorb heat from the outdoor air.

[0167] The compressor (202) compresses the refrigerant gas between the indoor heat exchanger (201) and the outdoor heat exchanger (203). The expansion device (204) lowers the pressure of the refrigerant between the indoor heat exchanger (201) and the outdoor heat exchanger (203). The indoor heat exchanger (201), the compressor (202), the outdoor heat exchanger (203), and the expansion device (204) may be connected by refrigerant pipes. During cooling, the refrigerant circulates in the order of the compressor (202), the outdoor heat exchanger (203), the expansion device (204), and the indoor heat exchanger (201), with the outdoor heat exchanger (203) functioning as a condenser and the indoor heat exchanger (201) functioning as an evaporator. During heating, the compressor (202), indoor heat exchanger (201), expansion device (204), and outdoor heat exchanger (203) circulate in that order, with the outdoor heat exchanger (203) functioning as an evaporator and the indoor heat exchanger (201) functioning as a condenser. Although not shown in the drawing,

[0168] As an electric motor (206), an electric motor (1) according to various embodiments described with reference to FIGS. 1 to 16 may be applied.

[0169] However, it is not limited thereto, and the electric motor (1) according to various embodiments described with reference to FIGS. 1 to 16 can be applied as a rotational driving means for various devices.

[0170] An outdoor unit of an air conditioner according to one aspect of the present disclosure comprises: an outdoor heat exchanger; a fan that generates a flow of air passing through the outdoor heat exchanger; and an electric motor that rotates the fan. The electric motor comprises: a stator that generates a rotating magnetic field; and a rotor that is opposed to the stator with an air gap between them and rotates by means of interaction with the rotating magnetic field. The rotor comprises: a plurality of rotor cores arranged spaced apart from each other in a circumferential direction; a plurality of magnets housed in a plurality of magnet housings between the plurality of rotor cores; and a resin molding part integrally molded with resin together with the plurality of rotor cores and the plurality of magnets. A plurality of magnet openings are provided on at least one of the upper surface and the lower surface of the resin molding part. Each of the plurality of magnet openings overlaps with at least one of the plurality of magnet housings. The geometric center of the plurality of magnet openings is deviated in the circumferential direction with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

[0171] In one embodiment, in each of the plurality of magnet housings and each of the plurality of magnet openings corresponding thereto, the distance between the magnet housed in the magnet housing and the two rotor cores forming the magnet housing may be narrower in the direction of deviation of the geometric center of the corresponding magnet opening than in the opposite direction.

[0172] In one embodiment, two or more of the magnet openings may be overlapped for each of the plurality of magnet storage portions.

[0173] In one embodiment, the two or more magnet openings may include an inner opening and an outer opening that overlap at the inner and outer sides, respectively, with a corresponding magnet storage part among the plurality of magnet storage parts.

[0174] In one embodiment, the geometric centers of the inner circumferential opening and the outer circumferential opening may be deviated in opposite directions in the circumferential direction with respect to the centerline of the corresponding magnet housing.

[0175] In one embodiment, the geometric centers of the inner circumferential opening and the outer circumferential opening may be deviated in the same direction in the circumferential direction with respect to the centerline of the corresponding magnet housing.

[0176] In one embodiment, the plurality of magnetic openings may be pinhole-shaped.

[0177] In one embodiment, the plurality of magnet openings may include a first opening extended in the circumferential direction such that at least a portion overlaps with two adjacent magnet storage portions among the plurality of magnet storage portions.

[0178] In one embodiment, in the first opening, the direction of deviation of the first geometric center of the first half portion that overlaps with the first magnet storage portion among the two adjacent magnet storage portions with respect to the center line of the first magnet storage portion may be the opposite direction of the direction of deviation of the second geometric center of the second half portion that overlaps with the second magnet storage portion among the two adjacent magnet storage portions with respect to the center line of the second magnet storage portion.

[0179] In one embodiment, the first opening (151) may include an inner opening that overlaps with adjacent first and second magnet storage sections, and an outer opening that overlaps with adjacent second magnet storage sections and third magnet storage sections and is spaced outward from the inner opening. The third magnet storage section is located adjacent to the second magnet storage section on the opposite side of the first magnet storage section with respect to the second magnet storage section.

[0180] In one embodiment, the direction of deviation with respect to the centerline of the second magnet storage part at the geometric center of the half portion where the inner circumferential opening overlaps with the second magnet storage part may be the opposite direction to the direction of deviation with respect to the centerline of the second magnet storage part at the geometric center of the half portion where the outer circumferential opening overlaps with the second magnet storage part.

[0181] In one embodiment, the plurality of magnetic openings and the plurality of magnetic storage portions may correspond one-to-one.

[0182] In one embodiment, each of the plurality of magnet openings may extend in the direction of the centerline of the corresponding magnet housing.

[0183] An electric motor according to one aspect of the present disclosure comprises: a stator that generates a rotating magnetic field; a rotor that is opposed to the stator with an air gap between them and rotates by means of interaction with the rotating magnetic field; wherein the rotor comprises: a plurality of rotor cores arranged spaced apart from each other in a circumferential direction; a plurality of magnets housed in a plurality of magnet housings between the plurality of rotor cores; and a resin molding portion integrally molded with resin together with the plurality of rotor cores and the plurality of magnets. A plurality of magnet openings are provided on at least one of the upper surface and the lower surface of the resin molding portion, and each of the plurality of magnet openings overlaps with at least one of the plurality of magnet housings, and the geometric center of the plurality of magnet openings is deviated in the circumferential direction with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

[0184] In one embodiment, in each of the plurality of magnet housings and each of the plurality of magnet openings corresponding thereto, the distance between the magnet housed in the magnet housing and the two rotor cores forming the magnet housing may be narrower in the direction of deviation of the geometric center of the corresponding magnet opening than in the opposite direction.

[0185] The technical effects intended to be achieved in this document are not limited to those mentioned above, and other technical effects not mentioned will be clearly understood by those skilled in the art to which this disclosure belongs from the description in this document.

[0186] As described above, although the electric motor of the present disclosure and the outdoor unit of an air conditioner employing the same have been explained by limited embodiments and drawings, the present disclosure is not limited to the above embodiments and various modifications are possible within the scope without departing from the spirit thereof.

Claims

1. Outdoor heat exchanger (203); A fan (205) that generates a flow of air passing through the above outdoor heat exchanger; and It includes an electric motor (206) that rotates the above fan, The above electric motor is, A stator (20) that generates a rotating magnetic field; It includes a rotor (10) that is opposed to the stator with an air gap between them and rotates by interaction with the rotating magnetic field. The above rotor is, A plurality of rotor cores (12) arranged spaced apart from each other in the circumferential direction; A plurality of magnets (13) stored in a plurality of magnet storage portions (19) between the plurality of rotor cores; and It includes a resin molded part (14) integrally molded with resin together with the plurality of rotor cores and the plurality of magnets, and A plurality of magnetic openings (15) are provided on at least one of the upper and lower surfaces of the resin molding part, and Each of the plurality of magnetic openings overlaps with at least one of the plurality of magnetic storage portions, and The geometric center of the plurality of magnet openings is an outdoor unit of an air conditioner that is deviated in the circumferential direction with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

2. In Paragraph 1, In each of the plurality of magnet storage portions and each of the plurality of magnet openings corresponding thereto, An outdoor unit of an air conditioner in which the gap between the magnet stored in the magnet storage portion and the two rotor cores forming the magnet storage portion is narrower on the side with the deviation direction of the geometric center of the corresponding magnet opening than on the opposite side.

3. In Paragraph 1 or 2, An outdoor unit of an air conditioner in which two or more of the magnetic openings overlap for each of the plurality of magnetic storage portions.

4. In Paragraph 3, The outdoor unit of an air conditioner, comprising two or more of the above-mentioned magnetic openings, an inner circumference opening and an outer circumference opening that respectively overlap on the inner circumference side and the outer circumference side with a corresponding magnetic storage part among the plurality of magnetic storage parts.

5. In Paragraph 4, An outdoor unit of an air conditioner in which the geometric centers of the inner circumferential opening and the outer circumferential opening are deviated in opposite directions in the circumferential direction with respect to the centerline of the corresponding magnet housing.

6. In Paragraph 4, The geometric centers of the inner circumferential opening and the outer circumferential opening are deviated in the same direction in the circumferential direction with respect to the centerline of the corresponding magnet housing for the outdoor unit of an air conditioner.

7. In any one of paragraphs 3 through 6, The above plurality of magnetic openings are pinhole-shaped outdoor units of an air conditioner.

8. In Paragraph 3, The above plurality of magnet openings includes a first opening (151) extended in the circumferential direction such that at least a portion overlaps with two adjacent magnet storage portions among the plurality of magnet storage portions.

9. In Paragraph 8, An outdoor unit of an air conditioner, wherein in the first opening, the first geometric center (W11b) of the first half portion overlapping with the first magnet storage portion (19a) among the two adjacent magnet storage portions has a deviation direction (E11b) with respect to the center line (Csa) of the first magnet storage portion (19a), and the second geometric center (W12b) of the second half portion overlapping with the second magnet storage portion (19b) among the two adjacent magnet storage portions has a deviation direction (E12b) with respect to the center line (Csb) of the second magnet storage portion (19b).

10. In Paragraph 8 or 9, The first opening (151) above is, It includes an inner circumferential opening (151b) that overlaps with adjacent first and second magnet storage sections (19a) (19b), and an outer circumferential opening (151c) that overlaps with adjacent second magnet storage sections (19b) and third magnet storage sections (19c) and is spaced outward from the inner circumferential opening (151b). The above third magnet storage unit (19c) is an outdoor unit of an air conditioner adjacent to the second magnet storage unit (19b) on the opposite side of the first magnet storage unit (19a) with respect to the second magnet storage unit (19b).

11. In Paragraph 10, An outdoor unit of an air conditioner in which the direction of deviation (E12b) with respect to the center line (Csb) of the second magnet storage part (19b) at the geometric center (W12b) of the half portion where the inner opening (151b) overlaps with the second magnet storage part (19b) is the opposite direction of the direction of deviation (E11c) with respect to the center line (Csb) of the second magnet storage part (19b) at the geometric center (W11c) of the half portion where the outer opening (151c) overlaps with the second magnet storage part (19b).

12. In Paragraph 1, The above plurality of magnetic openings and the above plurality of magnetic storage units correspond one-to-one to the outdoor unit of an air conditioner.

13. In Paragraph 12, Each of the above plurality of magnetic openings is an outdoor unit of an air conditioner that extends in the direction of the centerline of the corresponding magnetic housing.

14. A stator (20) that generates a rotating magnetic field; It includes a rotor (10) that is opposed to the stator with an air gap between them and rotates by interaction with the rotating magnetic field. The above rotor is, A plurality of rotor cores (12) arranged spaced apart from each other in the circumferential direction; A plurality of magnets (13) stored in a plurality of magnet storage portions (19) between the plurality of rotor cores; and It includes a resin molded part (14) integrally molded with resin together with the plurality of rotor cores and the plurality of magnets, and A plurality of magnetic openings (15) are provided on at least one of the upper and lower surfaces of the resin molding part, and Each of the plurality of magnetic openings overlaps with at least one of the plurality of magnetic storage portions, and The geometric center of the plurality of magnet openings is a motor deviated in the circumferential direction with respect to the centrifugal centerline of the corresponding magnet housing among the plurality of magnet housings.

15. In Paragraph 14, In each of the plurality of magnet storage portions and each of the plurality of magnet openings corresponding thereto, An electric motor in which the gap between the magnet housed in the magnet house and the two rotor cores forming the magnet house is narrower on the side of the deviation direction of the geometric center of the corresponding magnet opening than on the opposite side.

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