Permanent magnet synchronous motor and test equipment thereof

Abstract

The invention discloses a permanent magnet synchronous motor and test equipment thereof, and the permanent magnet synchronous motor comprises a permanent magnet synchronous motor main body, a fixed seat, an annular seat and a connecting pipe. The bottom of the permanent magnet synchronous motor body is connected with a base. The fixing seat is arranged on the lower side of the permanent magnet synchronous motor body and slidably connected with a mounting table, and the base is mounted on the mounting table. The annular base is fixedly connected to the fixing base, one end of the permanent magnet synchronous motor body is arranged in the annular base, a cavity is formed in the annular base, a plurality of through holes are formed in the inner wall of the annular base, and the cavity is communicated with the outside through the through holes. The heat dissipation capability of the permanent magnet synchronous motor can be improved, the permanent magnet material of the permanent magnet synchronous motor is prevented from being influenced by high temperature when the permanent magnet synchronous motor is used for a long time, the magnetic conductivity of the permanent magnet material can be ensured, and the demagnetization problem is avoided. Meanwhile, the heat dissipation structure of the permanent magnet synchronous motor can be utilized to carry out multi-state performance test on the permanent magnet synchronous motor, and the test precision is ensured.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet synchronous motor technology, specifically relating to a permanent magnet synchronous motor and its testing equipment. Background Technology

[0002] An electric motor is a power device that converts electrical energy into mechanical energy and vice versa. It mainly consists of a rotor, stator windings, a speed sensor, and components such as a housing and cooling system. Electric motors are classified according to their structure and operating principle: DC motors, asynchronous motors, and synchronous motors. Synchronous motors can be further classified into: permanent magnet synchronous motors, reluctance synchronous motors, and hysteresis synchronous motors.

[0003] Permanent magnet synchronous motors (PMSMs) incorporate permanent magnets during rotor manufacturing, further enhancing motor performance. Synchronization refers to the rotor's rotational speed always maintaining the same frequency as the stator winding's current. PMSMs offer a high power-to-weight ratio, are smaller and lighter, provide greater output torque than other types of motors, and exhibit superior speed limits and braking performance. Therefore, PMSMs have become the most widely used motors in electric vehicles today.

[0004] However, existing permanent magnet synchronous motors generally lack heat dissipation mechanisms, leading to high temperatures during prolonged use. When the permanent magnet material is exposed to high temperatures, its magnetic permeability decreases, and in some cases, demagnetization occurs, thus reducing the performance of the permanent magnet synchronous motor. Furthermore, existing permanent magnet synchronous motor testing equipment has limited functionality and cannot simultaneously perform tests on multiple performance characteristics, thereby affecting testing accuracy.

[0005] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a permanent magnet synchronous motor and its testing equipment.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a permanent magnet synchronous motor and its testing equipment, which can solve the problems mentioned above in the background art.

[0008] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0009] A permanent magnet synchronous motor includes: a permanent magnet synchronous motor body, a fixed base, an annular base, and a connecting pipe. A base is connected to the bottom of the permanent magnet synchronous motor body. The fixed base is located on the underside of the permanent magnet synchronous motor body, and a mounting platform is slidably connected to the fixed base; the base is mounted on the mounting platform. The annular base is fixedly connected to the fixed base, and one end of the permanent magnet synchronous motor body is located inside the annular base. The annular base has a cavity, and its inner wall has multiple through holes, which connect the cavity to the outside. The connecting pipe is installed inside the fixed base, with one end inside the cavity and the other end outside the fixed base.

[0010] In one or more embodiments of the present invention, the fixed base is provided with a sliding groove, and the mounting platform is slidably disposed in the sliding groove.

[0011] In one or more embodiments of the present invention, a slider is fixedly connected to the bottom surface of the mounting platform, an adjustment groove matching the slider is provided on the bottom wall of the slide groove, and a screw is rotatably connected to the fixed seat, the screw being threadedly connected to the slider.

[0012] In one or more embodiments of the present invention, a release pipe is connected to the annular seat, the interior of the annular seat is connected to the outside through the release pipe, and a control valve is installed on the release pipe.

[0013] In one or more embodiments of the present invention, a sealing ring is provided at the port of the inner wall of the annular seat, and an elastic ring is connected between the sealing ring and the inner wall of the annular seat, and the elastic ring is connected to the cavity.

[0014] A testing device for a permanent magnet synchronous motor, applied to the aforementioned permanent magnet synchronous motor, includes a test bench, an air pump, and a second three-way pipe. A testing machine is mounted on the test bench, and the testing machine is connected to the output shaft of the permanent magnet synchronous motor body via a coupling. The test bench contains a heating chamber and a cooling chamber. A heating component is installed in the heating chamber, and a cooling component is installed in the cooling chamber. The air pump is installed inside the test bench, and its outlet is connected to a first three-way pipe. One port of the first three-way pipe is connected to the heating chamber, and another port is connected to the cooling chamber. The second three-way pipe is installed on the outer wall of the test bench, with one port connected to the heating chamber, one port connected to the cooling chamber, and one port connected to a connecting pipe.

[0015] In one or more embodiments of the present invention, the heating assembly includes at least one fixing rod and at least one heating wire, the heating wire surrounding the fixing rod.

[0016] In one or more embodiments of the present invention, the refrigeration assembly includes a grid frame on which a refrigeration mechanism is provided.

[0017] In one or more embodiments of the present invention, a flow guide shroud is provided at one end of the first three-way pipe located in the wet cooling cavity, and the flow guide shroud is located on the lower side of the grid frame.

[0018] In one or more embodiments of the present invention, a return pipe is connected to the second three-way pipe, and the return pipe is connected to the release pipe.

[0019] Compared with existing technologies, the permanent magnet synchronous motor and its testing equipment of the present invention can improve the heat dissipation capacity of the permanent magnet synchronous motor, avoid the permanent magnet material from being affected by high temperatures during long-term use, and thus ensure the magnetic conductivity of the permanent magnet material and avoid demagnetization problems. At the same time, the heat dissipation structure of the permanent magnet synchronous motor can be used to perform multi-state performance testing, ensuring testing accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a permanent magnet synchronous motor according to an embodiment of the present invention;

[0022] Figure 2 This is a perspective view of a heat dissipation mechanism in one embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional view of a permanent magnet synchronous motor according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle;

[0025] Figure 5 for Figure 4 Schematic diagram of the structure at point B;

[0026] Figure 6 This is a first-angle perspective view of a test device for a permanent magnet synchronous motor according to an embodiment of the present invention;

[0027] Figure 7 This is a second perspective view of a test device for a permanent magnet synchronous motor according to an embodiment of the present invention;

[0028] Figure 8 This is a front cross-sectional view of a test device for a permanent magnet synchronous motor according to an embodiment of the present invention;

[0029] Figure 9 This is a side cross-sectional view of a test device for a permanent magnet synchronous motor according to an embodiment of the present invention;

[0030] Figure 10 for Figure 9 Schematic diagram of the structure at point C.

[0031] Explanation of key figure labels:

[0032] 1-Permanent magnet synchronous motor body, 101-Base, 2-Fixed seat, 201-Mounting platform, 202-Slide groove, 203-Slider, 204-Screw, 3-Annular seat, 301-Cavity, 302-Through hole, 303-Release pipe, 304-Sealing ring, 305-Elastic ring, 4-Connecting pipe, 5-Testing platform, 501-Testing machine, 502-Heating chamber, 5021-Fixed rod, 5022-Heating wire, 503-Wet cooling chamber, 5031-Grid frame, 5032-Refrigeration mechanism, 6-Air pump, 601-First tee pipe, 602-Guide shroud, 7-Second tee pipe, 701-Return pipe. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0034] like Figures 1 to 5 As shown, a permanent magnet synchronous motor according to one embodiment of the present invention includes a permanent magnet synchronous motor body 1, a fixed base 2, an annular base 3, and a connecting pipe 4. A base 101 is connected to the bottom of the permanent magnet synchronous motor body 1. The fixed base 2 is located on the lower side of the permanent magnet synchronous motor body 1, and a mounting platform 201 is slidably connected to the fixed base 2, with the base 101 mounted on the mounting platform 201. The annular base 3 is fixedly connected to the fixed base 2, with one end of the permanent magnet synchronous motor body 1 located inside the annular base 3. The annular base 3 has a cavity 301, and its inner wall has multiple through holes 302, which connect the cavity 301 to the outside. The connecting pipe 4 is installed inside the fixed base 2, with one end inside the cavity 301 and the other end outside the fixed base 2.

[0035] The base 101 is mounted on the mounting platform 201 using bolts, so that one end of the permanent magnet synchronous motor body 1 is placed inside the annular seat 3. Figure 1 The state is shown. When heat dissipation is required for the permanent magnet synchronous motor body 1, the connecting pipe 4 is connected to the air supply end. The air supply end supplies gas to the cavity 301 through the connecting pipe 4. The gas in the cavity 301 is injected into the permanent magnet synchronous motor body 1 through multiple through holes 302. The gas injected through the through holes 302 can flow at high speed between the permanent magnet synchronous motor body 1 and the annular seat 3. The high-speed airflow can carry away the heat generated by the permanent magnet synchronous motor body 1 during operation, so that the permanent magnet synchronous motor body 1 can be maintained at a relatively low temperature, avoiding high temperature conditions. This prevents the permanent magnet material of the permanent magnet synchronous motor body 1 from being affected by high temperature during long-term use, thus ensuring the magnetic conductivity of the permanent magnet material and avoiding demagnetization problems.

[0036] Preferably, the through hole 302 is inclined inwards towards the annular seat 3. Specifically, the inclination angle of the through hole 302 is 20-30°, i.e. Figure 4 The state shown allows the gas injected through the through hole 302 to flow towards the bottom of the annular seat 3, thereby prolonging the time the gas flows inside the annular seat 3 and improving the utilization rate of the gas so that the gas can fully carry away the heat generated by the permanent magnet synchronous motor body 1 during operation.

[0037] The annular seat 3 is connected to a release pipe 303, which connects the interior of the annular seat 3 to the outside. A control valve is installed on the release pipe 303. When the control valve is opened, the gas inside the annular seat 3 can be discharged through the release pipe 303, thereby preventing excessive gas pressure inside the annular seat 3 from affecting heat dissipation and ensuring the heat dissipation effect of the permanent magnet synchronous motor body 1.

[0038] Preferably, a pressure sensor is installed on the inner wall of the annular seat 3 to monitor the gas pressure inside the annular seat 3.

[0039] like Figures 1 to 5 As shown, a sealing ring 304 is provided at the inner wall port of the annular seat 3. An elastic ring 305 is connected between the sealing ring 304 and the inner wall of the annular seat 3, and the elastic ring 305 is connected to the cavity 301. When there is gas in the cavity 301, some gas will enter the elastic ring 305, causing the elastic ring 305 to expand. The expanded elastic ring 305 will cause the sealing ring 304 to press tightly against the outer wall of the permanent magnet synchronous motor body 1, that is... Figure 3 The state shown is as follows. At this time, the port of the annular seat 3 can be blocked so that the gas injected through the through hole 302 will not flow out through the port of the annular seat 3, but will be discharged through the release pipe 303. This can prolong the flow time of the gas in the annular seat 3, so that the gas can fully carry away the heat generated by the permanent magnet synchronous motor body 1 during operation, and prevent the permanent magnet material of the permanent magnet synchronous motor body 1 from being affected by high temperature, so as to ensure the magnetic conductivity of the permanent magnet material and avoid demagnetization problems.

[0040] Preferably, both the sealing ring 304 and the elastic ring 305 are made of high-temperature resistant elastic material.

[0041] like Figures 1 to 5 As shown, the fixed base 2 is provided with a sliding groove 202, and the mounting platform 201 is slidably disposed in the sliding groove 202. By sliding the mounting platform 201 in the sliding groove 202, the position of the mounting platform 201 can be adjusted so that the fixed base 2 can be equipped with different models of permanent magnet synchronous motor bodies 1, which facilitates heat dissipation for different models of permanent magnet synchronous motor bodies 1, thereby expanding the applicability of the fixed base 2 and the ring base 3.

[0042] The mounting platform 201 has a slider 203 fixedly connected to its bottom surface. The bottom wall of the slide groove 202 has an adjustment groove that matches the slider 203. A screw 204 is rotatably connected to the fixed base 2, and the screw 204 is threadedly connected to the slider 203. By rotating the screw 204, the slider 203 can move within the adjustment groove due to the thread action. When the slider 203 moves, it can drive the mounting platform 201 to move, thereby adjusting the position of the mounting platform 201 to install different models of permanent magnet synchronous motor bodies 1, thus expanding the overall applicability.

[0043] like Figures 6 to 10 As shown, a testing device for a permanent magnet synchronous motor according to an embodiment of the present invention is applied to the aforementioned permanent magnet synchronous motor, including a test bench 5, an air pump 6, and a second three-way pipe 7. A testing machine 501 is mounted on the test bench 5, and the testing machine 501 is connected to the output shaft of the permanent magnet synchronous motor body 1 via a coupling. The test bench 5 has a heating chamber 502 and a cooling chamber 503. A heating component is installed in the heating chamber 502, and a cooling component is installed in the cooling chamber 503. The air pump 6 is installed inside the test bench 5, and its outlet is connected to a first three-way pipe 601. One port of the first three-way pipe 601 is connected to the heating chamber 502, and another port is connected to the cooling chamber 503. The second three-way pipe 7 is installed on the outer wall of the test bench 5, with one port connected to the heating chamber 502, one port connected to the cooling chamber 503, and one port connected to a connecting pipe 4.

[0044] When testing the permanent magnet synchronous motor body 1, the mounting base 2 is installed on the test bench 5, and the output end of the permanent magnet synchronous motor body 1 is connected to the testing machine 501 using a coupling. Then, one port of the second three-way pipe 7 is connected to the connecting pipe 4, and the return pipe 701 is connected to the release pipe 303, as follows... Figure 6 and Figure 7 As shown. The permanent magnet synchronous motor body 1 is running, and the permanent magnet synchronous motor body 1 drives the testing machine 501 to run through the coupling, so that the testing machine 501 can be used for testing.

[0045] When a high-temperature test is required on the permanent magnet synchronous motor body 1, the heating components and air pump 6 inside the heating chamber 502 are activated. The air pump 6 draws gas and delivers it to the heating chamber 502 through the first three-way pipe 601. The heating components can instantly heat the gas inside the heating chamber 502 to quickly increase its temperature. The heated gas enters the cavity 301 through the second three-way pipe 7 and the connecting pipe 4, and then is injected into the gap between the permanent magnet synchronous motor body 1 and the annular seat 3 through the through hole 302, thereby increasing the operating environment temperature of the permanent magnet synchronous motor body 1 to simulate its use in a high-temperature environment. Then, the permanent magnet synchronous motor body 1 is activated, and the testing machine 501 can be used to test it.

[0046] When a low-temperature test is required on the permanent magnet synchronous motor body 1, the cooling components and air pump 6 inside the wet cooling chamber 503 are activated. The air pump 6 draws in gas and delivers it to the wet cooling chamber 503 through the first three-way pipe 601. The cooling components can quickly cool the gas inside the wet cooling chamber 503. The cooled gas enters the cavity 301 through the second three-way pipe 7 and the connecting pipe 4, and is then sprayed into the gap between the permanent magnet synchronous motor body 1 and the annular seat 3 through the through hole 302. This reduces the operating ambient temperature of the permanent magnet synchronous motor body 1, simulating its use in a low-temperature environment. Then, the permanent magnet synchronous motor body 1 is activated, and the testing machine 501 can be used to test it.

[0047] When a high-voltage test is required on the permanent magnet synchronous motor body 1, only the air pump 6 is operated, while the control valve on the release pipe 303 is closed. The gas generated by the air pump 6 is delivered to the gap between the permanent magnet synchronous motor body 1 and the annular seat 3, gradually increasing the internal air pressure of the annular seat 3. The internal air pressure of the annular seat 3 can be monitored using a pressure sensor. When the air pressure reaches the set value, the air pump 6 is turned off to simulate the operation of the permanent magnet synchronous motor body 1 under high-voltage conditions. The permanent magnet synchronous motor body 1 is then operated again, and the testing machine 501 can be used to test it.

[0048] During the high-temperature, low-temperature, and high-pressure tests described above, some of the gas inside cavity 301 will enter elastic ring 305, causing it to expand. The expanded elastic ring 305 will cause sealing ring 304 to adhere tightly to the outer wall of permanent magnet synchronous motor body 1, thereby sealing the port of annular seat 3. During high-temperature and low-temperature tests, the control valve on release pipe 303 can also be opened, allowing gas inside annular seat 3 to enter the second three-way pipe 7 through return pipe 701, and then return, thereby improving gas utilization.

[0049] like Figures 6 to 10As shown, the heating assembly includes at least one fixed rod 5021 and at least one heating wire 5022, with the heating wire 5022 surrounding the fixed rod 5021. When the heating wire 5022 is in operation, it can heat the gas in the heating chamber 502 in a timely manner to increase the gas temperature for subsequent simulation of a high-temperature environment.

[0050] like Figures 6 to 10 As shown, the cooling assembly includes a grid frame 5031, on which a cooling mechanism 5032 is mounted. The grid frame 5031 is used to house the cooling mechanism 5032, which is used to rapidly cool the gas inside the wet cooling chamber 503 to reduce the gas temperature for subsequent simulation of low-temperature environments.

[0051] Preferably, the refrigeration mechanism 5032 can be a commercially available compressor or other refrigeration equipment.

[0052] like Figures 6 to 10 As shown, the first three-way pipe 601 has a flow guide 602 at one end inside the wet cooling cavity 503, and the flow guide 602 is located on the lower side of the mesh frame 5031. The flow guide 602 can block the condensate generated during the operation of the refrigeration mechanism 5032, and prevent the condensate from entering the first three-way pipe 601.

[0053] The second three-way pipe 7 is connected to a return pipe 701, which is connected to a release pipe 303. When the control valve on the release pipe 303 is opened, the gas in the annular seat 3 can re-enter the second three-way pipe 7 through the release pipe 303 and the return pipe 701 to achieve gas return and thus improve gas utilization.

[0054] Preferably, a one-way valve is installed on the return pipe 701.

[0055] In summary, when heat dissipation of the permanent magnet synchronous motor body 1 is required, the connecting pipe 4 is connected to the air supply end. The gas supplied by the air supply end enters the cavity 301 through the connecting pipe 4, and then is injected into the permanent magnet synchronous motor body 1 through the through hole 302, so that the gas flows between the permanent magnet synchronous motor body 1 and the annular seat 3. The flowing gas carries away the heat generated by the permanent magnet synchronous motor body 1 during operation, preventing the permanent magnet material of the permanent magnet synchronous motor body 1 from being affected by high temperature during long-term use, thereby ensuring the magnetic conductivity of the permanent magnet material and avoiding demagnetization problems. By sliding the mounting platform 201 in the slide groove 202, the position of the mounting platform 201 can be adjusted to install different models of permanent magnet synchronous motor bodies 1, thereby enabling heat dissipation of different models of permanent magnet synchronous motor bodies 1 and improving the utilization rate of the fixed seat 2 and the annular seat 3.

[0056] When performance testing of the permanent magnet synchronous motor body 1 is required, the fixed base 2 is installed on the test bench 5, and then the base 101 is connected to the testing machine 501. Then, the heating and cooling components of the air pump 6 are run respectively. Using the fixed base 2 and the ring seat 3, high-pressure, high-temperature and low-temperature tests can be performed on the permanent magnet synchronous motor body 1 to conduct multi-state performance testing of the permanent magnet synchronous motor body 1 and ensure test accuracy.

[0057] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A permanent magnet synchronous motor, characterized in that, include: The main body of the permanent magnet synchronous motor has a base connected to its bottom. A fixed base is provided on the lower side of the permanent magnet synchronous motor body, and a mounting platform is slidably connected to the fixed base, with the base mounted on the mounting platform; A ring seat is fixedly connected to the fixed seat. One end of the permanent magnet synchronous motor body is located inside the ring seat. The ring seat has a cavity inside and multiple through holes on the inner wall of the ring seat. The cavity is connected to the outside through the through holes. A connecting pipe is installed inside the fixed base, with one end of the connecting pipe located inside the cavity and the other end located outside the fixed base.

2. The permanent magnet synchronous motor according to claim 1, characterized in that, The fixed base is provided with a sliding groove, and the mounting platform is slidably disposed in the sliding groove.

3. A permanent magnet synchronous motor according to claim 2, characterized in that, A slider is fixedly connected to the bottom surface of the mounting platform, and an adjustment groove matching the slider is provided on the bottom wall of the slide groove. A screw is rotatably connected to the fixed seat, and the screw is threadedly connected to the slider.

4. A permanent magnet synchronous motor according to claim 3, characterized in that, A release pipe is connected to the annular seat, and the interior of the annular seat is connected to the outside through the release pipe. A control valve is installed on the release pipe.

5. A permanent magnet synchronous motor according to claim 4, characterized in that, A sealing ring is provided at the port of the inner wall of the annular seat, and an elastic ring is connected between the sealing ring and the inner wall of the annular seat. The elastic ring is connected to the cavity.

6. A testing device for a permanent magnet synchronous motor, applied to the permanent magnet synchronous motor according to claim 5, characterized in that, include A test bench is provided, on which a testing machine is installed. The testing machine is connected to the output shaft of the permanent magnet synchronous motor via a coupling. The test bench is provided with a heating chamber and a wet cooling chamber. A heating component is installed in the heating chamber, and a cooling component is installed in the wet cooling chamber. An air pump is installed inside the test bench. The air pump outlet is connected to a first three-way pipe. One port of the first three-way pipe is connected to the heating chamber, and the other port of the first three-way pipe is connected to the humidification chamber. The second tee pipe is installed on the outer wall of the test bench. One port of the second tee pipe is connected to the heating chamber, one port of the second tee pipe is connected to the wet cooling chamber, and one port of the second tee pipe is connected to the connecting pipe.

7. The testing equipment for a permanent magnet synchronous motor according to claim 6, characterized in that, The heating assembly includes at least one fixed rod and at least one heating wire, the heating wire being wrapped around the fixed rod.

8. The testing equipment for a permanent magnet synchronous motor according to claim 6, characterized in that, The refrigeration component includes a grid frame, on which a refrigeration mechanism is provided.

9. The testing equipment for a permanent magnet synchronous motor according to claim 8, characterized in that, The first three-way pipe has a flow guide shroud at one end inside the wet cooling cavity, and the flow guide shroud is located on the lower side of the grid frame.

10. A testing device for a permanent magnet synchronous motor according to claim 6, characterized in that, A return pipe is connected to the second three-way pipe, and the return pipe is connected to the release pipe.

Images