Adjustable-speed motor, fixed-frequency compressor and refrigeration equipment

Abstract

The utility model provides an adjustable-speed motor, a fixed-frequency compressor and refrigeration equipment. The adjustable-speed motor comprises a stator assembly. The stator assembly includes a stator winding and a stator core. The stator winding comprises a first winding and a second winding arranged in parallel with the first winding. The stator core body is provided with a first center hole used for installing the rotor assembly and a plurality of wire embedding grooves, the sizes of the wire embedding grooves are uniform, and the first winding and the second winding are arranged in the wire embedding grooves in a stacked mode. The adjustable-speed motor has a first speed and a second speed smaller than the first speed. In the first speed state, at least parts of coils in the first winding and the second winding are arranged in parallel. And in the second speed state, the coils in the first winding and the second winding are respectively connected in series. The adjustable-speed motor provided by the utility model can drive the fixed-frequency compressor to operate at different rotating speeds under the high-load working condition and the low-load working condition, so that the energy consumption and the operation noise of the refrigeration equipment under the low-load working condition are reduced, and the user satisfaction is improved.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and in particular to a speed-regulating motor, a fixed-frequency compressor, and refrigeration equipment. Background Technology

[0002] Refrigeration equipment such as refrigerators, freezers, and air conditioners are indispensable household appliances. The compressor in a refrigeration system pumps refrigerant to power the system, allowing the equipment to adjust cooling capacity and temperature according to the user's needs. Typically, the compressor is driven by an electric motor, which compresses the refrigerant into a high-temperature, high-pressure gas within the compressor, providing the power to pump the refrigerant.

[0003] In some related technologies, refrigeration equipment uses a fixed-frequency compressor to pump refrigerant into the refrigeration system. However, refrigeration equipment often operates under high or low load conditions, but the motor driving the fixed-frequency compressor only has a fixed speed. This results in the refrigeration equipment still consuming a lot of energy and operating with high noise under low load conditions, leading to poor user satisfaction. Utility Model Content

[0004] In view of this, this application provides a speed-regulating motor, a fixed-frequency compressor, and a refrigeration device, which can reduce the energy consumption and operating noise of the refrigeration device under low-load conditions and improve user satisfaction.

[0005] Specifically, this application is implemented through the following technical solution:

[0006] According to a first aspect of the present application, a speed-regulating motor is provided, including a stator assembly. The stator assembly includes a stator winding and a stator core. The stator winding includes a first winding and a second winding connected in parallel with the first winding. The stator core has a first central hole for mounting a rotor assembly and a plurality of winding slots recessed in the inner wall of the first central hole, each winding slot having a uniform size, and the first winding and the second winding are stacked in the winding slots. The speed-regulating motor has a first speed and a second speed less than the first speed. In the first speed state, the coils in the first winding and the second winding are respectively configured to be at least partially connected in parallel. In the second speed state, the coils in the first winding and the second winding are respectively configured to be connected in series.

[0007] The technical solution of this application is further described below:

[0008] In one embodiment, the outer wall of the stator core is provided with an arc-shaped portion, and the bottom wall of each wire slot is equidistant from the arc-shaped portion along the radial direction of the first central hole.

[0009] In one embodiment, the difference between the radius R of the arcuate portion and the radius r of the first central hole is Δ(Rr), and the ratio between the depth h of the inlay groove and the difference Δ(Rr) ranges from 0.3 to 0.9.

[0010] In one embodiment, the distance d between the bottom wall of each inlay groove and the arcuate portion is set to 3 mm to 15 mm.

[0011] In one embodiment, the outer wall of the stator core is further provided with a mounting portion connected to the arc-shaped portion, and the protruding portion of the arc-shaped portion does not extend beyond the mounting portion in the direction from the first central hole to the outer wall of the stator core.

[0012] In one embodiment, at least two mounting portions are provided, each mounting portion is circumferentially spaced on the outer wall of the stator core along the first central hole, an arc-shaped portion is connected between two adjacent mounting portions, and each mounting portion is provided with a mounting hole opened axially along the first central hole, and the mounting hole is spaced apart from the bottom wall of the winding groove.

[0013] In one embodiment, the speed-regulating motor further includes a rotor assembly, which includes a rotor core having a second central hole coaxially disposed with the first central hole and rotor slots circumferentially spaced along the second central hole.

[0014] In one embodiment, the ratio between the cross-sectional area S1 of the rotor slot and the cross-sectional area S0 of the rotor core ranges from 0.2 to 0.6.

[0015] According to a second aspect of the present application, a fixed-frequency compressor is provided, including a housing with a receiving cavity, a terminal block disposed on the outer wall of the housing, and the aforementioned speed-regulating motor. The speed-regulating motor is disposed inside the housing, and the windings inside the speed-regulating motor are electrically connected to the terminal block.

[0016] According to a third aspect of the embodiments of this application, a refrigeration device is provided, including a housing assembly, a main control board disposed on the housing assembly, and the aforementioned fixed-frequency compressor. The fixed-frequency compressor is installed on the housing assembly, and the main control board is electrically connected to the fixed-frequency compressor to enable the fixed-frequency compressor to operate at a first speed or a second speed.

[0017] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0018] The speed-regulating motor provided in this application can achieve different operating speeds to cope with high and low load conditions by increasing the number of windings and adaptively modifying the shape of the winding slots. This allows the windings to be stacked in double layers within the slots, and the number of pole pairs can be flexibly changed through the series and parallel connections of the windings. For example, when the speed-regulating motor operates at a first speed, at least some of the coils in the first winding are connected in parallel, and correspondingly, at least some of the coils in the second winding are also connected in parallel, reducing the number of pole pairs. When the speed-regulating motor operates at a second speed, the coils in the first winding are connected in series, and correspondingly, the coils in the second winding are connected in series, increasing the number of pole pairs. Thus, the number of pole pairs in the second speed state is greater than the number of pole pairs in the first state, enabling the speed-regulating motor to operate at different speeds to cope with high and low load conditions.

[0019] Thus, the speed-regulating motor provided in this application can drive the fixed-frequency compressor to operate at different speeds under high-load and low-load conditions. In this way, under low-load conditions, the speed-regulating motor can drive the fixed-frequency compressor to operate at a speed lower than that under high-load conditions, thereby reducing energy consumption and operating noise of the refrigeration equipment under low-load conditions and improving user satisfaction.

[0020] Understandably, the speed control device provided in this application can be applied to refrigeration equipment, which is not limited to refrigerators, freezers, or air conditioners.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A cross-sectional schematic diagram of the winding groove provided for the stator core of an existing motor.

[0025] Figure 2 This is a cross-sectional schematic diagram of the stator assembly in the speed-regulating motor provided by this utility model.

[0026] Figure 3 A cross-sectional schematic diagram of the rotor assembly in the speed-regulating motor provided by this utility model.

[0027] Figure 4 A schematic diagram of the structure of the fixed-frequency compressor provided by this utility model.

[0028] Figure 5 A schematic diagram of the structure of the refrigeration equipment provided by this utility model.

[0029] Figure label:

[0030] 1-Refrigeration equipment; 10-Fixed frequency compressor; 100-Speed-regulating motor; 110-Stator assembly; 111-Stator core; 1111-First center hole; 1112-Wire slot; 1113-Mounting part; 1114-Arc-shaped part; 1115-Mounting hole; 112-Stator winding; 1121-First winding; 1122-Second winding; 120-Rotor assembly; 121-Rotor core; 122-Second center hole; 123-Rotor slot; 200-Housing; 300-Terminal; 20-Box assembly; 30-Main control board.

[0031] 2- Existing stator core; 21- Through hole; 22- First slot; 23- Second slot; 24- Third slot. Detailed Implementation

[0032] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0033] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, height, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures). If the specific posture changes, the directional indications or positional relationships will also change accordingly.

[0034] Refrigeration equipment such as refrigerators, freezers, and air conditioners are indispensable household appliances. The compressor in a refrigeration system pumps refrigerant to power the system, allowing the equipment to adjust cooling capacity and temperature according to the user's needs. Typically, the compressor is driven by an electric motor, which compresses the refrigerant into a high-temperature, high-pressure gas within the compressor, providing the power to pump the refrigerant.

[0035] In some related technologies, refrigeration equipment uses a fixed-frequency compressor to pump refrigerant into the refrigeration system. However, refrigeration equipment often operates under both high and low load conditions, but the motor driving the fixed-frequency compressor operates at a fixed speed. This means that regardless of whether the refrigeration equipment is under high or low load, the fixed-frequency compressor always runs at a constant speed to pump refrigerant into the refrigeration system. Consequently, the refrigeration equipment still consumes a lot of energy and operates noisily even under low load conditions, resulting in poor user satisfaction.

[0036] See details Figure 1 In related technologies, since motors driving fixed-frequency compressors typically have only one speed winding, such motors can only drive the fixed-frequency compressor at a fixed speed achievable by that speed winding. Because this type of motor only has one speed winding, the winding diameter of that speed winding only needs to be fixed, and the slots on the stator core of the motor are designed accordingly. Meanwhile, the existing stator core 2 of this type of motor typically has slots of three sizes (large, medium, and small) depending on the different wire diameters of a single winding, i.e., as shown... Figure 1 The first groove 22, the second groove 23, and the third groove 24 are shown.

[0037] However, to enable this motor to drive a fixed-frequency compressor at different speeds under high and low load conditions, windings of different speeds need to be added within the motor to achieve speed switching. However, in related technologies, the stator core of this type of motor, due to the current slot size, cannot accommodate the winding requirements of multiple windings.

[0038] Therefore, this application provides a speed-regulating motor 100 that can drive the fixed-frequency compressor 10 to operate at different speeds under high-load and low-load conditions, thereby reducing the energy consumption and operating noise of the refrigeration equipment 1 under low-load conditions.

[0039] The speed-regulating motor 100 provided in this application will now be described in conjunction with the accompanying drawings.

[0040] See Figure 2This application provides a speed-regulating motor 100, including a stator assembly 110. The stator assembly 110 includes a stator winding 112 and a stator core 111. The stator winding 112 includes a first winding 1121 and a second winding 1122 connected in parallel with the first winding 1121. The stator core 111 has a first central hole 1111 for mounting a rotor assembly 120 and a plurality of winding slots 1112 recessed in the inner wall of the first central hole 1111. Each winding slot 1112 has a uniform size, and the first winding 1121 and the second winding 1122 are stacked in the winding slots 1112. The speed-regulating motor 100 has a first speed and a second speed less than the first speed. In the first speed state, the coils in the first winding 1121 and the second winding 1122 are respectively configured to be at least partially connected in parallel. In the second speed state, the coils in the first winding 1121 and the second winding 1122 are respectively configured to be connected in series.

[0041] It should be noted that the stator winding 112 is typically made of wire and is embedded in the slot 1112 of the stator core 111, which can be used to generate a rotating magnetic field. The stator core 111 provides a closed magnetic flux path, and the first central hole 1111 of the stator core 111 can be used to mount the rotor assembly 120. The stator core 111 and the stator winding 112 interact with the rotor assembly 120 through the rotating magnetic field generated by the current, thereby driving the speed-regulating motor 100 to rotate.

[0042] Specifically, the stator winding 112 provided in this application includes a first winding 1121 and a second winding 1122. The first winding 1121 and the second winding 1122 are stacked in the winding slot 1112 in a double-layer winding manner to increase the torque per unit volume and the motor performance. Correspondingly, based on the increase in the number of windings in the speed-regulating motor 100, this application also enlarges and uniformly measures the winding slot 1112 provided on the stator core 111. This is to meet the double-layer stacking requirement of the first winding 1121 and the second winding 1122, and to increase the winding wire diameter to reduce copper loss and improve motor efficiency.

[0043] The first winding 1121 and the second winding 1122 can cooperate to form the main winding and the auxiliary winding. Through the flexible connection between the first winding 1121 and the second winding 1122, the number of pole pairs within the speed-regulating motor 100 can be changed, thereby achieving the switching of the operating speed of the speed-regulating motor 100. It can be understood that the second speed of the speed-regulating motor 100 is less than the first speed; therefore, the first speed is suitable for high-load operation, and the second speed is suitable for low-load operation.

[0044] As an example, when the speed-regulating motor 100 operates at a first speed, the coils in the first winding 1121 are connected in parallel with at least a portion of them, and the coils in the second winding 1122 are also connected in parallel with at least a portion of them, to reduce the number of pole pairs in the speed-regulating motor 100. When the speed-regulating motor 100 operates at a second speed, the coils in the first winding 1121 are connected in series with at least a portion of them, and the coils in the second winding 1122 are also connected in series with at least a portion of them, to increase the number of pole pairs in the speed-regulating motor 100. Thus, the speed-regulating motor 100 can switch between different numbers of pole pairs during operation, thereby changing its operating speed. It is understood that the number of pole pairs in the speed-regulating motor 100 at the second speed is greater than the number of pole pairs in the first speed. The number of pole pairs in the speed-regulating motor 100 at the second speed can be a multiple of the number of pole pairs in the first speed, and this application does not impose any restrictions. Furthermore, this application does not impose any restrictions on the series-parallel circuit connection method between the first winding 1121 and the second winding 1122. Meanwhile, the series-parallel switching of the first winding 1121 and the second winding 1122 can be flexibly controlled by relay switches or induction switches, which will not be elaborated in this application.

[0045] Thus, the speed-regulating motor 100 provided in this application, by increasing the number of windings and adaptively modifying the shape of the winding slot 1112, allows each winding to be stacked in double layers within the winding slot 1112. Furthermore, the number of pole pairs in the speed-regulating motor 100 can be flexibly changed through the series and parallel connections of the windings, thereby enabling the speed-regulating motor 100 to operate at different speeds to cope with high and low load conditions. In this way, under low load conditions, the speed-regulating motor 100 can rotate at a lower speed than under high load conditions, thereby reducing energy consumption and operating noise, and improving user satisfaction.

[0046] In some embodiments, the stator winding 112 may be made of copper or aluminum wire. The stator core 111 may be made of stacked thin silicon steel sheets to reduce eddy current losses through the high permeability of the thin silicon steel sheets.

[0047] In some embodiments, the speed-regulating motor 100 may be a 4-pole motor in the second speed state and a 2-pole motor in the first speed state. The speed-regulating motor 100 may be a single-phase asynchronous motor.

[0048] In some embodiments, the stator core 111 may have 14, 18, 24, 36 or 48 slots, etc., and this application does not impose any restrictions.

[0049] See Figure 2 In some embodiments, to avoid magnetic field saturation, the outer wall of the stator core 111 is provided with an arc-shaped portion 1114, and the bottom wall of each wire slot 1112 is equidistant from the arc-shaped portion 1114 along the radial direction of the first central hole 1111.

[0050] It should be noted that, in the original structure of the stator core 111, if only the winding slot 1112 of the stator core 111 is relatively enlarged, the remaining size between the bottom wall of the winding slot 1112 and the edge of the stator core 111 will be inconsistent, affecting the distribution of magnetic lines of force within the speed-regulating motor 100. However, by providing a corresponding arc-shaped portion 1114 on the outer wall of the stator core 111, sufficient area is maintained between the bottom wall of the winding slot 1112 and the edge of the stator core 111 while allowing for the enlargement of the winding slot 1112. This increases the cross-sectional area for magnetic line flow, reduces magnetic field saturation, and improves the efficiency of the speed-regulating motor 100.

[0051] See Figure 2 In some embodiments, to facilitate the setting of the dimensions of the wire groove 1112 and the arc-shaped portion 1114, the wire groove 1112 and the arc-shaped portion 1114 in this application can meet the following setting requirements: the difference between the radius R of the arc-shaped portion 1114 and the radius r of the first central hole 1111 is Δ(Rr), and the ratio between the depth h of the wire groove 1112 and the difference Δ(Rr) ranges from 0.3 to 0.9. It can be understood that the ratio between the depth h of the wire groove 1112 and the difference Δ(Rr) ranges from any number between 0.3 and 0.9, and also includes 0.3 and 0.9.

[0052] As an example, to ensure an effective cross-sectional area for magnetic field flow, the distance d between the bottom wall of each slot 1112 and the arcuate portion 1114 can be set to 3mm to 15mm. Understandably, the distance d can be any number between 3mm and 15mm, including both 3mm and 15mm. For example, the distance d can also be set to 4.5mm. This avoids the reduction in the cross-sectional area for magnetic field flow, magnetic field saturation, and decreased motor efficiency caused by an excessively small distance d, while also limiting the edge dimensions of the stator core 111 to avoid material waste. Furthermore, limiting the edge dimensions of the stator core 111 by the distance d also prevents the stator core 111 from being too large to fit the motor housing 200 or other housing components, which would require an expanded housing size to accommodate the stator core 111, hindering equipment miniaturization.

[0053] See Figure 2 In some embodiments, the outer wall of the stator core 111 is further provided with a mounting portion 1113 connected to the arc-shaped portion 1114. In the direction from the first central hole 1111 to the outer wall of the stator core 111, the protruding portion of the arc-shaped portion 1114 does not extend beyond the mounting portion 1113.

[0054] It should be noted that the stator core 111 can be fixedly connected to the motor housing 200 or other assembly housing via the mounting part 1113. Typically, the mounting part 1113 of the stator core 111 and the motor housing 200 or other assembly housing are positioned relatively fixed. By ensuring that the protruding portion of the arc-shaped part 1114 does not extend beyond the mounting part 1113, the original assembly position of the stator core 111 does not need to be changed. Thus, the dimensions of the motor housing 200, compressor housing 200, or other assembly housing assembled with the stator core 111 do not need to be changed, and the stator core 111 can be adapted for standard component installation.

[0055] As an example, when the variable-speed motor is installed in the fixed-frequency compressor 10, with the input voltage of 220V and the frequency of 50Hz of the fixed-frequency compressor 10 remaining unchanged, only the winding structure inside the fixed-frequency compressor 10 needs to be changed, without changing the outer dimensions of the casing of the fixed-frequency compressor 10. This allows the fixed-frequency compressor 10 to operate at a first speed under high load conditions and at a second speed under low load conditions. In this way, under low load conditions, the fixed-frequency compressor 10 operates at a speed lower than that under high load conditions, which can greatly reduce power consumption and operating noise.

[0056] See Figure 2 In some embodiments, to facilitate the assembly of the stator core 111, at least two mounting portions 1113 are provided. Each mounting portion 1113 is circumferentially spaced on the outer wall of the stator core 111, and an arc-shaped portion 1114 connects adjacent mounting portions 1113. It should be noted that the mounting portions 1113 can be symmetrically arranged relative to the first central hole 1111 to ensure that the stator core 111 is subjected to uniform force.

[0057] See Figure 2 In some embodiments, each mounting portion 1113 is provided with a mounting hole 1115 axially formed along the first central hole 1111, and the mounting hole 1115 is spaced apart from the bottom wall of the wire-insertion groove 1112. This arrangement allows the mounting hole 1115 to be used for fastener connection with bolts, locating pins, or screws, facilitating the assembly of the stator core 111. Simultaneously, the spaced arrangement of the mounting hole 1115 and the wire-insertion groove 1112 does not affect the cross-sectional area for magnetic flux flow.

[0058] See Figure 3 In some embodiments, the speed-regulating motor 100 further includes a rotor assembly 120, which includes a rotor core 121. The rotor core 121 has a second center hole 122 coaxially arranged with the first center hole 1111 and rotor slots 123 circumferentially distributed along the second center hole 122.

[0059] It should be noted that the rotor assembly 120 is used in conjunction with the stator assembly 110 to drive the speed-regulating motor 100 to rotate. The second center hole 122 can be used to assemble the rotor core 121, and the rotor slot 123 can be used to install wires. Based on the improvements to the stator assembly 110 provided in this application, the speed-regulating motor 100, when combined with the original rotor assembly 120, can still achieve switching between the first and second speeds of the speed-regulating motor 100. Therefore, the rotor assembly 120 of the speed-regulating motor 100 does not need modification; a conventional rotor assembly 120 can be used, thereby reducing the improvement cost of the speed-regulating motor 100.

[0060] See Figure 3 In some embodiments, to further improve the efficiency of the speed-regulating motor 100, the size of the rotor slot 123 is also increased, and the ratio between the cross-sectional area S1 of the rotor slot 123 and the cross-sectional area S0 of the rotor core 121 ranges from 0.2 to 0.6.

[0061] Understandably, the cross-sectional area S1 of the rotor slot 123 includes the total cross-sectional area of ​​all rotor slots on the rotor core 121. The cross-sectional area S0 of the rotor core 121 includes the annular cross-sectional area of ​​the rotor core 121 after removing the second central hole 122. The ratio of the cross-sectional area S1 to the cross-sectional area S0 can be any number between 0.2 and 0.6, including 0.2 and 0.6, and this application does not impose any limitation on it.

[0062] Thus, based on the improvement of the stator assembly 110, the speed-regulating motor 100 provided in this application can also further improve the rotor assembly 120, that is, increase the size of the rotor slot 123 on the rotor core 121 to increase the cross-sectional area of ​​the rotor slot 123 on the rotor core 121, thereby enabling the installation of wires with larger diameters to improve the operating efficiency of the speed-regulating motor 100.

[0063] As an example, the cross-sectional area S1 of the enlarged rotor slot 123 of the rotor assembly 120 can be twice the cross-sectional area of ​​the rotor slot before the improvement.

[0064] In addition to the speed-regulating motor 100 described above, this application also provides a fixed-frequency compressor 10 that uses the speed-regulating motor 100 described above. The fixed-frequency compressor 10 provided by this application will be described below with reference to the accompanying drawings.

[0065] See Figure 4 The fixed-frequency compressor 10 provided in this application includes a housing 200 with a receiving cavity, a terminal 300 disposed on the outer wall of the housing 200, and the aforementioned speed-regulating motor 100. The speed-regulating motor 100 is disposed inside the housing 200, and the winding inside the speed-regulating motor 100 is electrically connected to the terminal 300.

[0066] It should be noted that the compressor housing 200 is used to connect to the housing assembly 20 of the refrigeration equipment 1, and the speed-regulating motor 100 is used to drive the compressor to compress the refrigerant into a high-temperature, high-pressure gas within the compressor, thereby providing power for the compressor to pump the refrigerant. The compressor terminals 300 can be electrically connected to the windings of the speed-regulating motor 100 and extend outside the housing 200. This allows the operator to switch the series and parallel connections of the windings within the speed-regulating motor 100 by wiring the terminals 300, thereby controlling the speed-regulating motor 100 to operate at a first or second speed. Understandably, the compressor terminals 300 can also be electrically connected to an independent speed control module or to the main control board 30 of the refrigeration equipment 1 to control the speed-regulating motor 100 to switch the conduction of different windings, causing the speed-regulating motor 100 to operate at a first or second speed. Furthermore, the number of terminals 300 provided with the compressor can include 1, 2, 3, 4, 5, 6, 7, 8, or 9, etc., and this application does not impose any limitation.

[0067] Thus, when the speed-regulating motor 100 operates at the first speed, the compressor can be used under high-load conditions to pump refrigerant faster and in greater quantities. When the speed-regulating motor 100 operates at the second speed, the compressor can be used under low-load conditions to pump refrigerant slower and in smaller quantities. In this way, the compressor can operate at a lower speed than under high-load conditions when the refrigeration equipment 1 is under low-load conditions, thereby reducing energy consumption and operating noise.

[0068] Understandably, the fixed-frequency speed-regulating compressor also includes structures such as a cylinder, piston, oil pump, crankshaft, and connecting rod disposed within the housing 200. The cylinder is fixed to the stator assembly 110, the rotor assembly 120 is fitted onto the crankshaft through the second central hole 122, the connecting rod connects the piston and the crankshaft, and the oil pump's oil pipe is installed at the bottom of the crankshaft. Thus, when the speed-regulating motor 100 operates at a first speed or a second speed, oil in the oil pipe can be drawn into the cylinder, driving the cylinder to continuously pressurize the refrigerant, thereby forming a high-temperature, high-pressure gas that is pumped into the refrigeration system piping. Other structures of the fixed-frequency compressor 10 are not described in detail in this application.

[0069] In addition to the fixed-frequency compressor 10 described above, this application also provides a refrigeration device 1 that uses the fixed-frequency compressor 10 described above. The refrigeration device 1 provided by this application will be described below.

[0070] See Figure 5 This application provides a refrigeration device 1, including a housing assembly 20, a main control board 30 disposed on the housing assembly 20, and the aforementioned fixed-frequency compressor 10. The fixed-frequency compressor 10 is installed on the housing assembly 20, and the main control board 30 is electrically connected to the fixed-frequency compressor 10 to enable the fixed-frequency compressor 10 to operate at a first speed or a second speed.

[0071] It should be noted that the refrigeration equipment 1 includes a refrigerator, freezer, or air conditioner. For a refrigerator / freezer, the cabinet assembly 20 may include an outer shell and an inner liner installed on the outer shell. The inner liner has a refrigeration compartment, and there is an installation space between the outer shell and the inner liner that separates the refrigeration compartment. A fixed-frequency compressor 10 can be installed between the outer shell and the refrigeration space of the inner liner to pump refrigerant to the refrigeration system of the refrigerator / freezer to maintain the refrigeration effect of the refrigeration compartment. The main control board 30 is used to adjust the refrigeration temperature of the refrigerator / freezer and generate control commands according to other user control requirements. For an air conditioner, the cabinet assembly 20 may include the housing of the outdoor unit, and the fixed-frequency compressor 10 can be installed inside the housing of the outdoor unit. The main control board 30 is used to adjust the cooling / heating temperature of the air conditioner and generate control commands according to other user control requirements. Other structures of the refrigeration equipment 1 are not described in detail in this application.

[0072] Specifically, refrigeration equipment 1 is Figure 5 Taking the refrigerator shown as an example, during refrigerator use, the rated input voltage of the fixed-frequency compressor 10 is 220V and the frequency is 50Hz. The first speed of the fixed-frequency compressor 10 can reach 3000r / min, and the second speed can reach 1500r / min. High-load conditions for the refrigerator include scenarios such as the refrigerator being at an ambient temperature of 25℃ or higher, the user opening the door to put in a large amount of food, or the user frequently opening and closing the door. In these situations, the refrigerator's main control board 30 can identify that the refrigerator is in a high-load condition and drive the speed control device to make the fixed-frequency compressor 10 run at the first speed. Low-load conditions for the refrigerator include scenarios such as the refrigerator being at an ambient temperature of 25℃ or lower, the amount of food stored in the refrigerator's cooling compartment decreasing, or the door not being opened for a long time. In these situations, the refrigerator's main control board 30 can identify that the refrigerator is in a low-load condition and drive the speed control device to make the fixed-frequency compressor 10 run at the second speed to reduce the refrigerator's energy consumption and operating noise.

[0073] The technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings. All modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A speed-regulating motor, characterized in that, Includes a stator assembly, the stator assembly comprising: The stator winding includes a first winding and a second winding connected in parallel with the first winding; and The stator core has a first central hole for mounting the rotor assembly and a plurality of winding slots recessed in the inner wall of the first central hole. Each winding slot has a uniform size, and the first winding and the second winding are stacked in the winding slots. The speed-regulating motor has a first speed and a second speed less than the first speed; in the first speed state, the coils in the first winding and the second winding are respectively configured to be at least partially connected in parallel; in the second speed state, the coils in the first winding and the second winding are respectively configured to be connected in series.

2. The speed-regulating motor according to claim 1, characterized in that, The outer wall of the stator core is provided with an arc-shaped portion, and the bottom wall of each of the winding slots is equidistant from the arc-shaped portion along the radial direction of the first central hole.

3. The speed-regulating motor according to claim 2, characterized in that, The difference between the radius R of the arc-shaped portion and the radius r of the first central hole is Δ(Rr), and the ratio between the depth h of the inlay groove and the difference Δ(Rr) ranges from 0.3 to 0.

9.

4. The speed-regulating motor according to claim 3, characterized in that, The distance d between the bottom wall of each of the inlay grooves and the arc-shaped portion is set to 3mm to 15mm.

5. The speed-regulating motor according to claim 2, characterized in that, The outer wall of the stator core is also provided with a mounting portion connected to the arc-shaped portion. In the direction from the first central hole to the outer wall of the stator core, the protruding portion of the arc-shaped portion does not extend beyond the mounting portion.

6. The speed-regulating motor according to claim 5, characterized in that, At least two mounting portions are provided, each mounting portion is circumferentially spaced on the outer wall of the stator core along the first central hole, the arc-shaped portion is connected between two adjacent mounting portions, and each mounting portion is provided with a mounting hole opened along the axial direction of the first central hole, and the mounting hole is spaced apart from the bottom wall of the winding groove.

7. The speed-regulating motor according to any one of claims 1 to 6, characterized in that, The speed-regulating motor further includes a rotor assembly, which includes a rotor core. The rotor core has a second center hole coaxially arranged with the first center hole and rotor slots circumferentially spaced along the second center hole.

8. The speed-regulating motor according to claim 7, characterized in that, The ratio between the cross-sectional area S1 of the rotor slot and the cross-sectional area S0 of the rotor core ranges from 0.2 to 0.

6.

9. A fixed-frequency compressor, characterized in that, The device includes a housing with a receiving cavity, a terminal block disposed on the outer wall of the housing, and a speed-regulating motor as described in any one of claims 1 to 8, wherein the speed-regulating motor is disposed inside the housing, and the windings inside the speed-regulating motor are electrically connected to the terminal block.

10. A refrigeration device, characterized in that, The device includes a housing assembly, a main control board disposed on the housing assembly, and a fixed-frequency compressor as described in claim 9. The fixed-frequency compressor is installed on the housing assembly, and the main control board is electrically connected to the fixed-frequency compressor to enable the fixed-frequency compressor to operate at the first speed or the second speed.

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