A motor

Abstract

The present invention relates to the field of electric motors, and more specifically, to an electric motor comprising a housing having a stator core fixed to its inner wall and a rotor core fixed to a rotating shaft. The rotor core is rotatably disposed within the stator core via the rotating shaft. The rotor core has a first gas flow path formed therein extending through both axial ends thereof, and / or a second gas flow path formed therein extending through both axial ends thereof. Airflow generated by the rotation of a fan flows through the first gas flow path and / or the second gas flow path. Embodiments of the present invention provide a motor that at least addresses the technical problem of heat accumulation and slow heat dissipation within the stator core and / or rotor core of an EC motor.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a motor. Background Art

[0002] EC motors offer advantages such as a wide speed regulation range, constant efficiency, and high integration. However, they also have issues such as temperature rise, unstable performance, and a short service life. In particular, the integration of electronic control in EC motors results in insufficient internal heat dissipation space. Heat generated by EC motors during operation dissipates slowly, leading to high internal temperatures. This increased operating temperature increases winding resistance, deteriorating core performance, and increasing copper and iron losses, reducing motor efficiency. This temperature rise can also demagnetize permanent magnets and age insulation materials, leading to leakage currents and even fires and explosions. Therefore, improving the heat dissipation efficiency of EC motors has become an urgent technical challenge.

[0003] Existing heat dissipation methods remove heat through heat exchange between air and the surface of the motor casing. However, heat accumulates in the center of the stator winding copper wire, inside the iron core, and inside the rotor iron core inside the motor, forming a heat island area, which cannot be effectively dissipated using traditional heat dissipation methods. Summary of the Invention

[0004] The embodiment of the present invention provides a motor to at least solve the technical problem of heat accumulation and slow heat dissipation inside the stator core and / or rotor core of the EC motor;

[0005] To solve the above problem, the present invention provides a solution: a motor, characterized in that the motor includes a housing, a rotating shaft and a fan;

[0006] A stator core is fixed on the inner wall of the housing, and a rotor core is fixed on the rotating shaft;

[0007] The rotor core is rotatably arranged in the stator core via the rotating shaft;

[0008] The rotor core is formed with a first gas flow path running through both axial ends thereof;

[0009] And / or, the stator core is formed with a second gas flow path running through both axial ends thereof;

[0010] The fan is disposed in the housing. When the fan rotates, an airflow generated by the rotation of the fan flows through the first gas flow path and / or the second gas flow path.

[0011] Preferably, when a first gas flow path is formed on the rotor core, the first gas flow path includes a first through groove formed on the outer wall surface of the rotor core and / or a first through hole formed inside the rotor core.

[0012] Preferably, a second gas flow path is formed on the stator core, and the second gas flow path includes a second through groove formed on the outer wall surface of the stator core and / or a second through hole formed inside the stator core.

[0013] Preferably, insulating frames are respectively provided at both ends of the stator core, and a heat sink is provided on the insulating frame at least at one end of the stator core.

[0014] Preferably, the insulating frame includes an outer baffle and an inner baffle, a winding slot is formed between the outer baffle and the inner baffle, slots are formed on opposite sides of the bottom of the winding slot, the heat sink is inserted into the slot and contacts the winding wound in the winding slot.

[0015] Preferably, the height of the winding slot is H1, the length is L1, the width is W1, and the thickness is T1. The slot is a rectangular body, the length of the rectangular body is L2, the width is W2, and the height is H2. The processing quantity is N1, N1·W2<W1, L2<T1, H2≦H1; the length of the thermal conductive plate is L3, the width is W3, and the height is H3, L3<L1, W3=W2, H3≦H2; the thermal conductive plates do not interfere with each other.

[0016] Preferably, a middle partition is provided in the housing, the middle partition divides the internal space of the housing into a first chamber and a second chamber, the integral component formed by the stator core and the rotor core is located in the first chamber, and a controller for controlling the motor is provided in the second chamber;

[0017] The rotating shaft can rotatably pass through the middle partition, and the second end of the rotating shaft is located outside the shell, and the first end of the rotating shaft passes through the first chamber and the middle partition and is located in the second chamber; a ventilation hole is formed on the middle partition.

[0018] Preferably, the first gas flow path and / or the second gas flow path, the through-holes and the winding slots constitute a circulating ventilation loop.

[0019] Preferably, the first end of the rotating shaft is located inside the shell, the second end of the rotating shaft passes through the shell and is located outside the shell, the fan is fixed to the first end of the rotating shaft, and the rotating shaft drives the fan to rotate.

[0020] Preferably, the controller includes a control board, a heat-conducting material is filled between the control board and the housing, and heat dissipation fins are provided on the outer surface of the housing opposite to the heat-conducting material.

[0021] The present invention provides gas flow paths on the stator core and rotor core of the EC motor, thereby increasing the contact area between the stator core and the rotor core and the external air. When the fan in the motor rotates, the fan drives the gas in contact with the stator core and the rotor core to flow, thereby accelerating the heat exchange between the stator core and the rotor core and the air, and improving the heat dissipation efficiency of the stator core and the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 This is a front cross-sectional view of an EC motor according to an embodiment of the present invention;

[0024] Figure 2 This is an axial view of the stator core according to an embodiment of the present invention;

[0025] Figure 3 This is an axial view of the rotor core according to an embodiment of the present invention;

[0026] Figure 4 For the embodiment of the present invention Figure 3 Middle AA section view;

[0027] Figure 5 This is an axial diagram of the stator core according to an embodiment of the present invention;

[0028] Figure 6 This is a first schematic diagram of an insulating skeleton according to an embodiment of the present invention;

[0029] Figure 7 This is a second schematic diagram of an insulating skeleton according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the insulating skeleton slot structure according to an embodiment of the present invention;

[0031] Figure 9 It is a schematic diagram of a heat conducting sheet and a heat conducting sheet inserted in an embodiment of the present invention.

[0032] Among them: 1-housing; 2-rotating shaft; 3-fan; 4-stator core; 5-rotor core; 6-first through slot; 7-first through hole; 8-second through slot; 9-second through hole; 10-heat conducting plate; 11-support member; 12-inner baffle; 13-outer baffle. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0035] EC motors have the advantages of a wide speed regulation range, constant efficiency, and high integration. However, they also have problems such as temperature rise, unstable performance, and short service life. In particular, in order to achieve integrated electronic control, EC motors have insufficient internal heat dissipation space. The heat generated by EC motors during operation is dissipated slowly, and the internal temperature is high. As the motor operating temperature rises, the winding resistance increases, the core performance deteriorates, and the copper and iron losses increase, which reduces the operating efficiency of the motor. The temperature increase may also cause the permanent magnets to demagnetize and the insulation material to age, which can easily cause leakage and even fire, explosion and other accidents. Therefore, improving the heat dissipation efficiency of EC motors has become a technical problem that needs to be solved urgently. The existing heat dissipation method uses heat exchange between air and the surface of the motor casing to remove heat. However, due to heat accumulation in the center of the stator winding copper wire, the inside of the core, and the inside of the rotor core, heat island areas are formed, and traditional heat dissipation methods cannot effectively dissipate heat.

[0036] The embodiment of the present invention provides a motor to at least solve the technical problem of heat accumulation and slow heat dissipation inside the stator core and rotor core of the EC motor;

[0037] The examples are as follows:

[0038] In a specific implementation, the gas flow path may be provided on both the stator core 4 and the rotor core 5 , or may be provided on only one of them; the embodiment is described below by taking the example of providing the gas flow path on both.

[0039] like Figure 1-9As shown, a motor is characterized in that the motor includes a shell 1, a rotating shaft 2 and a fan 3; a stator core 4 is fixed on the inner wall of the shell 1, and a rotor core 5 is fixed on the rotating shaft 2; the rotor core 5 is rotatably arranged in the stator core 4 through the rotating shaft 2; a first gas flow path is formed on the rotor core 5 and passes through its two axial ends; a second gas flow path is formed on the stator core 4 and passes through its two axial ends; the airflow generated by the rotation of the fan 3 in the shell 1 flows through the first gas flow path and the second gas flow path; the gas flows inside the motor driven by the fan 3, and the gas flows through the first gas flow path and the second gas flow path, thereby increasing the heat exchange efficiency between the stator core 4 and the rotor core 5 and the air; the fan 3 can be arranged on the rotating shaft 2, or it can be separately arranged in the shell 1 and driven by a separate small motor.

[0040] Preferably, Figure 3-4 As shown, a first gas flow path is formed on the rotor core 5, and the first gas flow path includes a first through groove 6 formed on the outer wall of the rotor core 5 and a first through hole 7 formed inside the rotor core 5; Figure 2 As shown, a second gas flow path is formed on the stator core 4, and the second gas flow path includes a second through groove 8 formed on the outer wall surface of the stator core 4, and a second through hole 9 formed inside the stator core 4; gas flow paths are provided on both the inner and outer walls of the stator core 4; and heat exchange between the stator core 4 and the outside is accelerated; gas flow paths are provided on both the inner and outer walls of the rotor core 5; and heat exchange between the rotor core 5 and the outside is accelerated.

[0041] Preferably, Figure 6-7 As shown, insulating frames 14 are respectively provided at both ends of the stator core 4; heat sinks are provided on the insulating frames 14 located at both ends of the stator core 4; of course, the heat sink can also be provided at only one end; the insulating frame 14 includes an outer baffle 13 and an inner baffle 12, a winding slot 1401 is formed between the outer baffle 13 and the inner baffle 12, and slots 1402 are formed on opposite sides of the winding slot 1401, and the heat sink is inserted into the slot 1402 and contacts the winding wound in the winding slot 1401; the heat conducting sheet 10 is provided in the winding slot 1401 and contacts the winding in the winding slot 1401, generally speaking, the winding is a copper wire winding; the heat conducting sheet 10 is made of aluminum, and in order to avoid leakage between the heat sink and the winding, insulating glue can be applied to the outer surface of the heat sink; the direct contact between the heat sink and the winding accelerates the exchange of heat generated by the winding.

[0042] Preferably, Figure 6-9As shown, the height of the winding slot 1401 is H1, the length is L1, the width is W1, and the thickness is T1. The slot 1402 is a rectangular body with a depth of L2, a width of W2, and a height of H2. The processing quantity is N1, N1·W2<W1, L2<T1, and H2≦H1; the length of the thermal conductive sheet 10 is L3, the width is W3, and the height is H3, L3<L1, W3=W2, and H3≦H2; the thermal conductive sheets 10 do not interfere with each other, and the thermal conductive sheets 10 can be more conveniently inserted into the slot 1402. The non-interference between the thermal conductive sheets 10 allows the winding to be wound between the thermal conductive sheets 10.

[0043] Preferably, Figure 1 As shown, the first end of the rotating shaft 2 is located inside the housing 1, the second end of the rotating shaft 2 passes through the housing 1 and is located outside the housing 1, the fan 3 is fixed to the first end of the rotating shaft 2, and the rotating shaft 2 drives the fan 3 to rotate; Figure 5 As shown, a middle partition 11 is provided in the shell 1, and the middle partition 11 divides the internal space of the shell 1 into a first chamber 101 and a second chamber 102. The integral component formed by the stator core 4 and the rotor core 5 is located in the first chamber 101, and a controller for controlling the motor is provided in the second chamber 102; the rotating shaft 2 can rotatably pass through the middle partition, and the second end of the rotating shaft 2 is located outside the shell 1, and the first end of the rotating shaft 2 passes through the first chamber 101 and the middle partition 11 and is located in the second chamber 102; a ventilation hole 1101 is formed on the middle partition 11; the controller includes a control board, and the space between the control board and the shell 1 is filled with heat-conducting material; the first gas flow path and / or the second gas flow path, the through-hole air hole and the winding slot 1401 constitute a circulating ventilation loop; generally, the movement of the coil during the operation of the motor generates great interference and back electromotive force, which will interfere with the control signal, especially when the power is suddenly cut off, the large back electromotive force will be generated, which may burn destroy the controller; therefore, a middle partition 11 is set in the motor to divide the inside of the motor into two chambers, so that the controller is located in the second chamber 102, and the integral component formed by the stator and the rotor is located in the first chamber 101, so as to avoid the occurrence of the above problems, and at the same time, a ventilation hole 1101 is set on the middle partition 11. When the fan 3 rotates, the fan 3 can drive the air flow from the ventilation hole 1101 into the first chamber 101, thereby accelerating the flow of gas in the first chamber 101 and accelerating the heat exchange in the first chamber 101; in order to further dissipate heat, phenolic resin is filled between the control board and the shell 1 to accelerate the heat on the control board to be transferred to the outside through the shell 1; to avoid the control board from being damaged by excessive temperature; at the same time, phenolic resin also has a certain shock-absorbing effect. When the motor is working, the vibration generated by the motor is subjected to the shock-absorbing effect of the phenolic resin, so that the controller avoids large vibration, ensures the stability of the controller, and also improves the service life of the controller.

[0044] Preferably, the middle partition 11 and the rear end cover of the shell 1 are fixed by screws, which facilitates installation and disassembly and maintenance, and makes the internal distribution of the EC motor compact and reasonable.

[0045] In order to improve the heat exchange efficiency between the housing 1 of the EC motor and the external air, heat dissipation fins can be provided on the outside of the rear end of the motor to increase the contact area with the air, thereby accelerating the heat dissipation of the housing 1.

[0046] When the motor in this embodiment is in use, the power supply is started, and the motor is started by the controller. Under the action of the electromagnetic force, the rotor core 5 drives the rotating shaft 2 to rotate, the rotating shaft 2 drives the fan 3 to rotate, and the fan 3 drives the gas to flow. The gas passes through the ventilation hole 1101 on the middle partition 11 and enters the first chamber 101 from the second chamber 102. The airflow passes through the first through slot 6 and the first through hole 7 on the stator core 4, which accelerates the heat exchange between the stator core 4 and the outside; the airflow passes through the second through slot 8 and the second through hole 9 on the rotor core 5, which accelerates the heat exchange between the rotor core 5 and the outside; a part of the heat generated on the stator core 4 is transferred to the skeleton and the skeleton through the winding. The heat conducting sheet 10 on the motor is passed through the heat conducting sheet 10, and the gas flows, so that the heat conducting sheet 10 and the frame exchange heat with the external air. In this way, the heat generated by the stator core 4 and the rotor core 5 basically enters the gas inside the motor. The higher temperature gas in the shell 1 contacts the shell 1, and the heat is transferred to the outside of the motor through the shell 1 to complete the heat dissipation. A part of the heat generated by the stator core 4 is also directly transferred to the outside of the motor through the shell 1. Since the controller itself also generates heat when working, and part of the heat in the shell 1 is also transferred to the controller, the heat on the controller is transferred to the phenolic resin between the control board and the shell 1 through the control board, and then transferred to the outside through the shell 1.

[0047] The present invention has the following significant advantages:

[0048] 1. The present invention provides gas flow paths on the stator core and rotor core of the EC motor. The gas flow paths increase the contact area between the stator core and rotor core and the external air. When the fan inside the motor rotates, the fan drives the gas in contact with the stator core and rotor core to flow, thereby accelerating heat exchange between the stator core and rotor core and the air, thereby improving the heat dissipation efficiency of the stator core and rotor core.

[0049] 2. The present invention provides a heat conducting plate in the winding slot, so that the winding and the heat conducting plate are in direct contact, so that the heat generated by the winding and the frame and the heat transferred from the stator core to the frame are transferred to the air more quickly through the heat conducting plate, effectively avoiding the stator core temperature from being too high.

[0050] 3. The present invention fills phenolic resin between the control board and the shell, which can fix the control board on the one hand, and on the other hand, because the thermal conductivity of phenolic resin is higher than that of air, the heat exchange efficiency between the control board and the shell is increased; because the phenolic resin fits tightly with both the control board and the shell, the direct contact area is increased, thereby improving the heat exchange efficiency.

[0051] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included within the spirit and scope of the appended claims.

Claims

1. A motor, characterized in that: The motor includes a housing, a rotating shaft and a fan; A stator core is fixed on the inner wall of the housing, and a rotor core is fixed on the rotating shaft; The rotor core is rotatably arranged in the stator core via the rotating shaft; The rotor core is formed with a first gas flow path running through both axial ends thereof; And / or, the stator core is formed with a second gas flow path running through both axial ends thereof; The fan is disposed in the housing, and when the fan rotates, an airflow generated by the rotation of the fan flows through the first gas flow path and / or the second gas flow path; Insulating frames are respectively provided at both ends of the stator core, and a heat sink is provided on the insulating frame at least at one end of the stator core; The insulating frame includes an outer baffle and an inner baffle, a winding slot is formed between the outer baffle and the inner baffle, slots are formed on opposite sides of the bottom of the winding slot, the heat sink is inserted into the slots and contacts the winding wound in the winding slot; The slots are vertically arranged on the side of the insulating frame, each slot is correspondingly installed with a heat sink, and the number of the slots is equal to the number of the heat sinks.

2. A motor according to claim 1, characterized in that: When a first gas flow path is formed on the rotor core, the first gas flow path includes a first through groove formed on an outer wall surface of the rotor core and / or a first through hole formed inside the rotor core.

3. The motor according to claim 1, characterized in that: A second gas flow path is formed on the stator core. The second gas flow path includes a second through groove formed on the outer wall surface of the stator core and / or a second through hole formed inside the stator core.

4. The motor according to claim 1, characterized in that: The height of the winding slot is H1, the length is L1, the width is W1, and the thickness is T1. The slot is a rectangular body with a length of L2, a width of W2, and a height of H2. The processing quantity is N1, N1·W2<W1, L2<T1, and H2≦H1; the length of the heat sink is L3, the width is W3, and the height is H3, L3<L1, W3=W2, and H3≦H2; the heat sinks do not interfere with each other.

5. The motor according to claim 4, characterized in that: A middle partition is provided in the housing, the middle partition dividing the internal space of the housing into a first chamber and a second chamber, the integral component formed by the stator core and the rotor core is located in the first chamber, and a controller for controlling the motor is provided in the second chamber; The rotating shaft can rotate through the middle partition, and the second end of the rotating shaft is located outside the shell, and the first end of the rotating shaft passes through the first chamber and the middle partition and is located in the second chamber; a ventilation hole is formed on the middle partition.

6. The motor according to claim 5, characterized in that: The first gas flow path and / or the second gas flow path, the ventilation holes and the winding slots constitute a circulating ventilation loop.

7. The motor according to claim 1, characterized in that: The first end of the rotating shaft is located in the housing, the second end of the rotating shaft passes through the housing and is located outside the housing, the fan is fixed to the first end of the rotating shaft, and the rotating shaft drives the fan to rotate.

8. A motor according to claim 5 or 6, characterized in that: The controller includes a control board. A heat-conducting material is filled between the control board and the housing. A heat-dissipating fin is provided on the outer surface of the housing opposite to the heat-conducting material.

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