Rotor assembly for permanent magnet synchronous motor

Abstract

The invention relates to the technical field of permanent magnet synchronous motors, and discloses a rotor assembly for a permanent magnet synchronous motor, which comprises a permanent magnet synchronous motor, and the permanent magnet synchronous motor comprises a rotor assembly arranged in the permanent magnet synchronous motor and an end cover arranged on the side surface of the permanent magnet synchronous motor, the temperature change in the permanent magnet synchronous motor is monitored in real time through the monitoring system in the permanent magnet synchronous motor, so that the current input quantity of the cooling gas supply assembly is controlled, and the cooling gas input quantity of the cooling gas supply assembly to the interior of the automatic monitoring cooling mechanism is controlled; and meanwhile, when the monitoring system judges that the open fire phenomenon occurs in the permanent magnet synchronous motor, the automatic monitoring cooling mechanism sprays a fire extinguishing agent into the permanent magnet synchronous motor under the action of the cooling gas, and the effect of rapidly removing the open fire phenomenon in the permanent magnet synchronous motor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and more particularly to a rotor assembly for a permanent magnet synchronous motor, which is particularly suitable for the efficient heat dissipation and safety protection scenarios of high power density permanent magnet synchronous motors under complex working conditions, and can be widely applied to fields with strict reliability requirements such as new energy vehicle drive motors, industrial servo motors, and special motors for aerospace. Background Art

[0002] Due to advantages such as high power density and high efficiency, permanent magnet synchronous motors are widely used in new energy vehicles, industrial drives, and renewable energy systems. However, when its rotor assembly operates at high speed and high load, it is prone to generate high temperatures due to eddy current losses and hysteresis losses, leading to the risk of permanent magnet demagnetization, which seriously affects the performance and lifespan of the motor. Traditional heat dissipation solutions (such as air cooling and liquid cooling) have the following limitations: I. Insufficient heat dissipation efficiency: Conventional air cooling or liquid cooling solutions are difficult to directly act on the rotor surface, resulting in high temperature areas concentrated at the junction of the rotor core and the permanent magnet. Long-term operation is likely to cause irreversible demagnetization of the permanent magnet; II. Lack of safety protection: Internal short circuits or insulation failures in the motor may trigger arc fires, and traditional cooling systems lack a linkage mechanism with fire protection functions, resulting in delayed accident response; Therefore, there is an urgent need for a rotor assembly for a permanent magnet synchronous motor to solve the above-mentioned technical problems. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a rotor assembly for a permanent magnet synchronous motor to solve the problems existing in the above-mentioned background art.

[0004] The present invention provides the following technical solution: A rotor assembly for a permanent magnet synchronous motor, comprising: A permanent magnet synchronous motor, wherein the permanent magnet synchronous motor includes a rotor assembly disposed inside thereof and an end cover disposed on its side. The rotor assembly includes an output end, and a bearing is installed on the outer surface of the output end, and the bearing is disposed inside the end cover; A cooling gas supply assembly for supplying the cooling gas required for the cooling operation of the rotor assembly, wherein the cooling gas supply assembly is disposed at the bottom of the permanent magnet synchronous motor; An automatic monitoring and cooling mechanism for cooling the permanent magnet synchronous motor and rapidly cooling the inside of the permanent magnet synchronous motor, wherein the automatic monitoring and cooling mechanism is disposed on the side of the end cover; The cooling gas supply component inputs a stable working current to generate cooling gas and transports it into the automatic monitoring and cooling mechanism to cool down the rotor component and quickly cool down the internal components of the permanent magnet synchronous motor. The automatic monitoring and cooling mechanism quickly performs a fire-fighting operation on the internal open fire phenomenon of the permanent magnet synchronous motor.

[0005] Further, the automatic monitoring and cooling mechanism includes a cooling annular plate, where the cooling annular plate is installed on the inner side of the end cover, and the rotor component is arranged inside the automatic monitoring and cooling mechanism. A cooling chamber is provided on the inner wall of the middle area of the automatic monitoring and cooling mechanism. The cooling gas supply component includes two input ends and one output end. An input pipe and an output pipe a are successively installed on one input end and the output end of the cooling gas supply component respectively. One ends of the input pipe and the output pipe a away from the cooling gas supply component are respectively arranged in the cooling chamber opened on the inner wall of the automatic monitoring and cooling mechanism.

[0006] Further, an output pipe b is installed inside the other input end of the cooling gas supply component. One end of the output pipe b away from the cooling gas supply component is arranged inside the permanent magnet synchronous motor. The cooling gas supply component inputs a stable working current to generate cooling gas, which is transmitted through the input pipe to the cooling chamber opened on the inner wall of the automatic monitoring and cooling mechanism to cool down the rotor component. The cooling gas in the cooling chamber returns to the inside of the cooling gas supply component through the output pipe a, achieving the effect of recycling the cooling gas.

[0007] Further, annular placement grooves are provided on the inner walls on both sides of the cooling annular plate. An annular partition is installed on the inner wall of the middle area of the placement groove. The annular partition divides the annular placement groove into two independent sealed spaces. A plurality of extrusion components are successively and equidistantly movably sleeved on the inner wall of the annular partition. One ends of the plurality of extrusion components away from the annular partition are installed with rubber layers. The rubber layers are laid on the inner side surfaces on both sides of the cooling annular plate, and compressed air is provided inside the rubber layers to drive the rubber layers to be in an expanded state. The expanded rubber layers do not contact the outer surface of the rotor component. A pressure monitoring device is provided inside the rubber layers.

[0008] Further, when the rotor component shows a deviation phenomenon, one end of the rotor component is in an inclined state and will contact the surface of the rubber layer, driving the accommodation space inside the rubber layer to decrease. The pressure monitoring device monitors the change in the real-time pressure data inside the rubber layer and transmits this pressure data change phenomenon to the monitoring system to assist the monitoring system in judging whether the rotor component has a position deviation.

[0009] Further, a spring is vertically installed on the side of the extrusion assembly near the rubber layer, and one end of the spring away from the extrusion assembly is vertically installed on the inner side of the placement groove. An electromagnetic valve e is installed between the cooling chamber opened inside the cooling annular plate and the placement groove for transmitting the cooling gas inside the cooling chamber to the inside of the placement groove, driving the extrusion assembly to move towards the rubber layer.

[0010] Further, spray pipes are sequentially and equidistantly penetrated and installed on the outer surfaces of both sides of the cooling annular plate near the cooling chamber opened inside it. The central axis of the spray pipe forms an inclination angle of 15° with the plane normal of the cooling annular plate. A sealing cover is movably installed on the outer surface of one end of the spray pipe away from the cooling annular plate, and a torsion spring device c is installed at the connection end of the sealing cover and the spray pipe; A fire protection shell is installed on the outer surface of the middle area of the cooling annular plate. An independent and sealed storage space is formed between the outer surface of the cooling annular plate and the inner side surface of the fire protection shell. A fire extinguishing agent is arranged in this storage space, and an electromagnetic valve f is arranged in the middle area of the cooling annular plate for inputting the cooling gas in the cooling chamber into this storage space. A plurality of groups of auxiliary air outlet holes are sequentially and equidistantly opened on the outer surface of the fire protection shell. The central axis of the auxiliary air outlet hole forms an inclination angle of 15° with the plane normal of the fire protection shell. A sealing plate is movably installed inside the auxiliary air outlet hole, and a torsion spring device d is installed at the connection part of the sealing plate and the auxiliary air outlet hole.

[0011] The technical effects and advantages of the present invention: The present invention monitors the temperature change inside the permanent magnet synchronous motor in real time through the monitoring system inside the permanent magnet synchronous motor, thereby controlling the current input amount of the cooling gas supply component, thereby controlling the cooling gas input amount of the cooling gas supply component into the automatic monitoring cooling mechanism, thereby accelerating the cooling efficiency of the rotor assembly and the temperature of the surface of the rotor assembly. At the same time, when the monitoring system determines that there is a fire inside the permanent magnet synchronous motor, the automatic monitoring cooling mechanism sprays a fire extinguishing agent into the permanent magnet synchronous motor under the action of the cooling gas, achieving the effect of quickly removing the fire inside the permanent magnet synchronous motor.

[0012] The present invention drives the extrusion assembly to move towards the rubber layer by opening the electromagnetic valve e to transmit the cooling gas inside the cooling chamber to the inside of the placement groove, clamping the rotor assembly, and at the same time keeping the rotor assembly in a horizontal state, avoiding certain damage to the components inside the permanent magnet synchronous motor caused by the rotor assembly in a deviated state. Brief Description of the Drawings

[0013] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is Figure 1The sectional view of the end cover shown; Figure 3 is Figure 2 The overall structural schematic diagram of the automatic monitoring and cooling mechanism shown; Figure 4 is Figure 3 The sectional view of the cooling annular plate shown; Figure 5 is Figure 4 The enlarged schematic diagram of the structure at A shown; Figure 6 is Figure 4 The sectional view of a partial structure of the output pipe a shown; Figure 7 is Figure 3 The overall structural schematic diagram of the fire protection shell shown.

[0014] The reference numerals are: 1, permanent magnet synchronous motor; 101, rotor assembly; 102, end cover; 103, bearing; 2, cooling gas supply assembly; 201, input pipe; 202, output pipe a; 203, output pipe b; 3, automatic monitoring and cooling mechanism; 301, cooling annular plate; 302, injection pipe; 3021, sealing cover; 3022, torsion spring device c; 303, fire protection shell; 3031, auxiliary air outlet; 304, sealing plate; 3041, torsion spring device d; 305, rubber layer; 306, solenoid valve e; 307, extrusion assembly; 308, annular partition; 309, spring. Detailed implementation manners

[0015] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples, and a rotor assembly for a permanent magnet synchronous motor involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0016] Referring to Figures 1 to 2 shown, the present invention provides a rotor assembly for a permanent magnet synchronous motor, including: a permanent magnet synchronous motor 1, wherein the permanent magnet synchronous motor 1 includes a rotor assembly 101 disposed inside thereof and an end cover 102 disposed on its side. The rotor assembly 101 includes an output end, and a bearing 103 is installed on the outer surface of the output end, and the bearing 103 is disposed inside the end cover 102; a cooling gas supply assembly 2 for providing cooling gas required for the cooling operation of the rotor assembly 101, wherein the cooling gas supply assembly 2 is disposed at the bottom of the permanent magnet synchronous motor 1; The automatic monitoring and cooling mechanism 3 is used for cooling the permanent magnet synchronous motor 1 and rapidly cooling the interior of the permanent magnet synchronous motor 1, wherein the automatic monitoring and cooling mechanism 3 is arranged on the side surface of the end cover 102; The cooling gas supply component 2 inputs a stable working current to generate cooling gas and transports it into the automatic monitoring and cooling mechanism 3 to cool down the rotor assembly 101 and rapidly cool down the internal components of the permanent magnet synchronous motor 1. The automatic monitoring and cooling mechanism 3 conducts rapid fire-fighting operations on the open fire phenomenon inside the permanent magnet synchronous motor 1.

[0017] In the embodiment of the present application, a monitoring system is arranged inside the permanent magnet synchronous motor 1 to monitor the temperature change inside the permanent magnet synchronous motor 1 and determine whether there is an over-temperature or open fire phenomenon inside the permanent magnet synchronous motor 1.

[0018] The specific working process of this part of the embodiment of the application is as follows: The monitoring system inside the permanent magnet synchronous motor 1 monitors the temperature change inside the permanent magnet synchronous motor 1 in real time, thereby controlling the current input amount of the cooling gas supply component 2, thereby controlling the input amount of the cooling gas from the cooling gas supply component 2 into the automatic monitoring and cooling mechanism 3, thereby accelerating the cooling efficiency of the rotor assembly 101 and the temperature of the surface of the rotor assembly 101. At the same time, when the monitoring system determines that there is an open fire phenomenon inside the permanent magnet synchronous motor 1, the automatic monitoring and cooling mechanism 3, driven by the cooling gas, controls the fire extinguishing agent to be sprayed into the permanent magnet synchronous motor 1 to achieve the effect of rapidly removing the open fire phenomenon inside the permanent magnet synchronous motor 1.

[0019] Referring to Figures 1 to 7 As shown, the present invention provides a rotor assembly for a permanent magnet synchronous motor. The automatic monitoring and cooling mechanism 3 includes a cooling annular plate 301, wherein the cooling annular plate 301 is installed on the inner side surface of the end cover 102, and the rotor assembly 101 is arranged inside the automatic monitoring and cooling mechanism 3. A cooling chamber is opened on the inner wall of the middle area of the automatic monitoring and cooling mechanism 3. The cooling gas supply component 2 includes two input ends and one output end. An input pipe 201 and an output pipe a202 are sequentially installed on one input end and the output end of the cooling gas supply component 2 respectively. One ends of the input pipe 201 and the output pipe a202 away from the cooling gas supply component 2 are respectively arranged in the cooling chamber opened on the inner wall of the automatic monitoring and cooling mechanism 3; Another set of input ends of the cooling gas supply component 2 is installed with an output pipe b203. One end of the output pipe b203 away from the cooling gas supply component 2 is arranged inside the permanent magnet synchronous motor 1. The cooling gas supply component 2 inputs a stable working current to generate cooling gas, which is transmitted through the input pipe 201 to the cooling chamber opened on the inner wall of the automatic monitoring cooling mechanism 3 to cool down the rotor assembly 101. The cooling gas in the cooling chamber returns to the inside of the cooling gas supply component 2 through the output pipe a202, achieving the effect of recycling the cooling gas; On the inner walls on both sides of the cooling annular plate 301, annular placement grooves are opened. In the inner wall of the middle area of this placement groove, an annular partition 308 is installed. The annular partition 308 divides the annular placement groove into two independent sealed spaces, and a plurality of extrusion components 307 are sequentially and equidistantly movably sleeved on the inner wall of the annular partition 308. One end of the plurality of extrusion components 307 away from the annular partition 308 is installed with a rubber layer 305. The rubber layer 305 is laid on the inner side surfaces on both sides of the cooling annular plate 301, and compressed air is arranged inside the rubber layer 305 to drive the rubber layer 305 to be in an expanded state. The rubber layer 305 in the expanded state does not contact the outer surface of the rotor assembly 101. A pressure monitoring device is arranged inside the rubber layer 305; When the rotor assembly 101 has a deviation phenomenon, one end of the rotor assembly 101 is in an inclined state and will contact the surface of the rubber layer 305, driving the accommodation space inside the rubber layer 305 to decrease. The pressure monitoring device monitors the change of the real-time pressure data inside the rubber layer 305 and transmits this pressure data change phenomenon to the monitoring system, which is used to assist the monitoring system in judging whether the rotor assembly 101 has a position deviation; On the side surface of the extrusion component 307 close to the rubber layer 305, a spring 309 is vertically installed. One end of the spring 309 away from the extrusion component 307 is vertically installed on the inner side surface of the placement groove. An electromagnetic valve e306 is installed between the cooling chamber opened inside the cooling annular plate 301 and the placement groove, which is used to transmit the cooling gas inside the cooling chamber to the inside of the placement groove to drive the extrusion component 307 to move towards the rubber layer 305; On the outer surfaces on both sides of the cooling annular plate 301 close to the cooling chamber opened inside it, injection pipes 302 are sequentially and equidistantly penetrated and installed. The central axis of the injection pipe 302 forms an inclination angle of 15° with the plane normal line of the cooling annular plate 301. On the outer surface of one end of the injection pipe 302 away from the cooling annular plate 301, a sealing cover 3021 is movably installed, and a torsion spring device c3022 is installed at the connection end of the sealing cover 3021 and the injection pipe 302; On the outer surface of the middle area of the cooling annular plate 301, a fire protection shell 303 is installed. An independent sealed storage space is formed between the outer surface of the cooling annular plate 301 and the inner side surface of the fire protection shell 303. A fire extinguishing agent is arranged in this storage space. And an electromagnetic valve f is arranged in the middle area of the cooling annular plate 301, which is used to input the cooling gas in the cooling chamber into this storage space. And a plurality of groups of auxiliary air outlet holes 3031 are sequentially and equidistantly arranged on the outer surface of the fire protection shell 303. The central axis of the auxiliary air outlet hole 3031 forms an inclination angle of 15° with the plane normal of the fire protection shell 303. A sealing plate 304 is movably installed inside the auxiliary air outlet hole 3031. A torsion spring device d3041 is installed at the connection between the sealing plate 304 and the auxiliary air outlet hole 3031.

[0020] The specific working process of this part of the application embodiment is as follows: The cooling gas supply component 2 inputs a stable working current to generate cooling gas, which is transmitted to the cooling chamber opened on the inner wall of the automatic monitoring and cooling mechanism 3 through the input pipe 201 to perform a cooling operation on the rotor assembly 101. The cooling gas in the cooling chamber returns to the inside of the cooling gas supply component 2 through the output pipe a202, achieving the effect of recycling the cooling gas; When the internal temperature of the permanent magnet synchronous motor 1 exceeds the critical value, the stable working current input by the cooling gas supply component 2 increases, the amount of cooling air input into the cooling chamber increases, and at the same time, the output pipe a202 stops recovering the cooling gas in the cooling chamber. When the pressure generated by the compressed cooling gas in the cooling chamber is greater than the torsion spring force generated by the torsion spring device c3022, the control seal cover 3021 is in an open state, and the cooling gas in the cooling chamber is directly transported to the inside of the permanent magnet synchronous motor 1 for rapid cooling operation. The cooling gas inside the permanent magnet synchronous motor 1 returns to the cooling gas supply component 2 through the output pipe b203 to achieve the effect of recycling the cooling gas; When there is a fire inside the cooling gas supply component 2, the electromagnetic valve f is in an open state, and the cooling gas in the cooling chamber is transmitted to the inside of the fire protection shell 303. When the pressure generated by the cooling gas inside the fire protection shell 303 is greater than the torsion spring force generated by the torsion spring device d3041, it will drive the sealing plate 304 to be in an open state, and control the fire extinguishing agent inside the fire protection shell 303 to be transported to the inside of the permanent magnet synchronous motor 1 to perform a fire protection operation on the fire inside the permanent magnet synchronous motor 1; When the rotor assembly 101 is deviated, one end of the rotor assembly 101 is in an inclined state and will contact the surface of the rubber layer 305, driving the reduction of the accommodation space inside the rubber layer 305. The pressure monitoring device monitors the change of the real-time pressure data inside the rubber layer 305 and transmits this pressure data change phenomenon to the monitoring system to assist the monitoring system in judging whether the rotor assembly 101 has a position deviation; When the rotor assembly 101 is deviated, the solenoid valve e306 is in an open state to transfer the cooling gas inside the cooling chamber to the inside of the placement groove, driving the extrusion assembly 307 to move towards the rubber layer 305 to clamp the rotor assembly 101, and at the same time keeping the rotor assembly 101 in a horizontal state to prevent the deviated rotor assembly 101 from causing certain damage to the components inside the permanent magnet synchronous motor 1.

[0021] The specific working process of this application is as follows: Step 1: The monitoring system inside the permanent magnet synchronous motor 1 monitors the temperature change inside the permanent magnet synchronous motor 1 in real time, thereby controlling the current input of the cooling gas supply component 2, and then controlling the amount of cooling gas input by the cooling gas supply component 2 into the automatic monitoring and cooling mechanism 3, so as to improve the cooling efficiency of the rotor assembly 101 and the temperature on the surface of the rotor assembly 101. At the same time, when the monitoring system determines that there is a fire inside the permanent magnet synchronous motor 1, under the action of the cooling gas, the automatic monitoring and cooling mechanism 3 sprays a fire extinguishing agent into the permanent magnet synchronous motor 1 to quickly eliminate the fire inside the permanent magnet synchronous motor 1. Step 2: The cooling gas supply component 2 inputs a stable working current to generate cooling gas, which is transmitted through the input pipe 201 to the cooling chamber opened on the inner wall of the automatic monitoring and cooling mechanism 3 to cool down the rotor assembly 101. The cooling gas in the cooling chamber returns to the inside of the cooling gas supply component 2 through the output pipe a202, achieving the effect of recycling the cooling gas. When the temperature inside the permanent magnet synchronous motor 1 exceeds the critical value, the stable working current input by the cooling gas supply component 2 increases, the amount of cooling air input into the cooling chamber increases, and at the same time, the output pipe a202 stops recovering the cooling gas in the cooling chamber. When the pressure generated by the compressed cooling gas in the cooling chamber is greater than the torsional spring force generated by the torsional spring device c3022, the control seal cover 3021 is in an open state, and the cooling gas in the cooling chamber is directly transported to the inside of the permanent magnet synchronous motor 1 for rapid cooling. The cooling gas inside the permanent magnet synchronous motor 1 returns to the cooling gas supply component 2 through the output pipe b203 to achieve the effect of recycling the cooling gas. When there is a fire inside the cooling gas supply component 2, the solenoid valve f is in an open state, and the cooling gas in the cooling chamber is transported to the inside of the fire protection shell 303. When the pressure generated by the cooling gas inside the fire protection shell 303 is greater than the torsional spring force generated by the torsional spring device d3041, it will drive the sealing plate 304 to be in an open state, controlling the fire extinguishing agent inside the fire protection shell 303 to be transported to the inside of the permanent magnet synchronous motor 1 to carry out fire protection operations on the fire inside the permanent magnet synchronous motor 1. When the position of the rotor assembly 101 deviates, one end of the rotor assembly 101 is in an inclined state and will contact the surface of the rubber layer 305, driving the reduction of the accommodation space inside the rubber layer 305. The pressure monitoring device monitors the change in the real-time pressure data inside the rubber layer 305 and transmits this pressure data change phenomenon to the monitoring system to assist the monitoring system in judging whether the rotor assembly 101 has a position deviation; When the rotor assembly 101 has a deviation, the solenoid valve e306 is in an open state to transfer the cooling gas inside the cooling chamber to the inside of the placement groove, driving the extrusion assembly 307 to move towards the rubber layer 305 to clamp the rotor assembly 101, and at the same time keeping the rotor assembly 101 in a horizontal state to prevent the rotor assembly 101 in a deviated state from causing certain damage to the components inside the permanent magnet synchronous motor 1.

[0022] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change; Second: In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments of the present disclosure are involved. Other structures can refer to the usual designs. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor assembly for a permanent magnet synchronous motor, characterized in that, Comprising: A permanent magnet synchronous motor (1), wherein the permanent magnet synchronous motor (1) includes a rotor assembly (101) disposed inside thereof and an end cover (102) disposed on its side. The rotor assembly (101) includes an output end, and a bearing (103) is mounted on the outer surface of the output end, and the bearing (103) is disposed inside the end cover (102). A cooling gas providing assembly (2) for providing the cooling gas required for the cooling operation of the rotor assembly (101), wherein the cooling gas providing assembly (2) is disposed at the bottom of the permanent magnet synchronous motor (1). An automatic monitoring cooling mechanism (3) for performing a cooling operation on the permanent magnet synchronous motor (1) and rapidly cooling the inside of the permanent magnet synchronous motor (1), wherein the automatic monitoring cooling mechanism (3) is disposed on the side of the end cover (102). The cooling gas providing assembly (2) inputs a stable working current to generate cooling gas and transports it into the automatic monitoring cooling mechanism (3) to perform a cooling and temperature reduction operation on the rotor assembly (101) and a rapid temperature reduction operation on the internal components of the permanent magnet synchronous motor (1). The automatic monitoring cooling mechanism (3) performs a rapid fire extinguishing operation on the internal open fire phenomenon of the permanent magnet synchronous motor (1).

2. The rotor assembly for a permanent magnet synchronous motor according to claim 1, wherein: The automatic monitoring cooling mechanism (3) includes a cooling annular plate (301), wherein the cooling annular plate (301) is mounted on the inner side surface of the end cover (102), and the rotor assembly (101) is disposed inside the automatic monitoring cooling mechanism (3). A cooling chamber is opened on the inner wall of the middle area of the automatic monitoring cooling mechanism (3). The cooling gas providing assembly (2) includes two input ends and one output end. An input pipe (201) and an output pipe a (202) are sequentially mounted on one input end and the output end of the cooling gas providing assembly (2). One ends of the input pipe (201) and the output pipe a (202) far away from the cooling gas providing assembly (2) are respectively disposed in the cooling chamber opened on the inner wall of the automatic monitoring cooling mechanism (3).

3. The rotor assembly for a permanent magnet synchronous motor according to claim 2, characterized in that: An output pipe b (203) is mounted inside the other input end of the cooling gas providing assembly (2). One end of the output pipe b (203) far away from the cooling gas providing assembly (2) is disposed inside the permanent magnet synchronous motor (1). The cooling gas providing assembly (2) inputs a stable working current to generate cooling gas, which is transmitted through the input pipe (201) to the cooling chamber opened on the inner wall of the automatic monitoring cooling mechanism (3) to perform a cooling and temperature reduction operation on the rotor assembly (101). The cooling gas in the cooling chamber returns to the inside of the cooling gas providing assembly (2) through the output pipe a (202), achieving the effect of recycling the cooling gas.

4. A rotor assembly for a permanent magnet synchronous motor according to claim 2, characterized in that: On the inner walls on both sides of the cooling annular plate (301), annular placement grooves are formed. An annular partition plate (308) is installed on the inner wall of the middle area of the placement groove. The annular partition plate (308) divides the annular placement groove into two groups of independent sealed spaces. A plurality of extrusion assemblies (307) are sequentially and equidistantly movably sleeved on the inner wall of the annular partition plate (308). One end of the plurality of extrusion assemblies (307) away from the annular partition plate (308) is provided with a rubber layer (305). The rubber layer (305) is laid on the inner side surfaces on both sides of the cooling annular plate (301). Compressed air is arranged inside the rubber layer (305) to drive the rubber layer (305) to be in an expanded state. The rubber layer (305) in the expanded state does not contact the outer surface of the rotor assembly (101). A pressure monitoring device is arranged inside the rubber layer (305).

5. A rotor assembly for a permanent magnet synchronous motor according to claim 4, characterized in that: When the rotor assembly (101) is deviated, one end of the rotor assembly (101) is in an inclined state and will contact the surface of the rubber layer (305), driving the reduction of the accommodation space inside the rubber layer (305). The pressure monitoring device monitors the change of the real-time pressure data inside the rubber layer (305) and transmits the pressure data change phenomenon to the monitoring system to assist the monitoring system in judging whether the rotor assembly (101) has a position deviation.

6. A rotor assembly for a permanent magnet synchronous motor according to claim 4, characterized in that: On the side surface of the extrusion assembly (307) close to the rubber layer (305), a spring (309) is vertically installed. One end of the spring (309) away from the extrusion assembly (307) is vertically installed on the inner side surface of the placement groove. An electromagnetic valve e (306) is installed between the cooling chamber formed inside the cooling annular plate (301) and the placement groove to transmit the cooling gas inside the cooling chamber to the inside of the placement groove and drive the extrusion assembly (307) to move towards the rubber layer (305).

7. A rotor assembly for a permanent magnet synchronous motor according to claim 2, characterized in that: On the outer surfaces on both sides of the cooling annular plate (301) close to the cooling chamber formed inside it, injection pipes (302) are sequentially and equidistantly penetrated. The central axis of the injection pipe (302) forms an inclination angle of 15° with the plane normal of the cooling annular plate (301). A sealing cover (3021) is movably installed on the outer surface of one end of the injection pipe (302) away from the cooling annular plate (301), and a torsion spring device c (3022) is installed at the connection end of the sealing cover (3021) and the injection pipe (302); A fire protection shell (303) is installed on the outer surface of the middle area of the cooling annular plate (301). An independent and sealed storage space is formed between the outer surface of the cooling annular plate (301) and the inner side surface of the fire protection shell (303). A fire extinguishing agent is arranged in this storage space. An electromagnetic valve f is arranged in the middle area of the cooling annular plate (301) for inputting the cooling gas in the cooling chamber into this storage space. Multiple groups of auxiliary air outlet holes (3031) are sequentially and equidistantly formed on the outer surface of the fire protection shell (303). The central axis of the auxiliary air outlet hole (3031) forms an inclination angle of 15° with the plane normal line of the fire protection shell (303). A sealing plate (304) is movably installed inside the auxiliary air outlet hole (3031). A torsion spring device d (3041) is installed at the connection between the sealing plate (304) and the auxiliary air outlet hole (3031).

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