High-voltage self-starting permanent magnet synchronous motor

Abstract

The invention belongs to the technical field of permanent magnet synchronous motors, and particularly relates to a high-voltage self-starting permanent magnet synchronous motor, which comprises a permanent magnet synchronous motor, a high-voltage self-starting frequency converter, a heat dissipation cavity and a heat dissipation cover, the heat dissipation cavity is formed in the front side of the permanent magnet synchronous motor, the permanent magnet synchronous motor comprises a rotating shaft, fan blades are fixed to the outer side of the front end of the rotating shaft, and the heat dissipation cover is fixedly installed on the front side of the heat dissipation cavity; through holes are formed in the left side and the right side of the heat dissipation cover, sliding rods are fixed to the inner walls of the through holes, sleeves are arranged on the left side and the right side of the front end of the heat dissipation cavity, the sleeves are inserted into the through holes, holes are formed in the sleeves, and the sliding rods are slidably connected into the holes. And the heat dissipation performance is poor, so that the heat dissipation is not timely during high-strength operation of the motor, and the magnet in the motor is damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnet synchronous motors, and in particular relates to a high-voltage self-starting permanent magnet synchronous motor. Background Art

[0002] The main defects of permanent magnet synchronous motors include temperature sensitivity. Permanent magnet synchronous motors are sensitive to temperature. When the ambient temperature rises, the magnetic properties of the permanent magnets will decrease, thus affecting the performance of the motor. Therefore, in a high temperature environment, the performance of the permanent magnet synchronous motor may be affected, and the permanent magnet synchronous motors currently on the market are equipped with inverters to cope with high-power operation. During high-power operation, the traditional method of heat dissipation through a fan blade can no longer quickly discharge the heat in the motor, which makes the motor easy to be damaged and the performance is affected. This phenomenon has become a problem that needs to be solved urgently by people in this field. Summary of the invention

[0003] The object of the present invention is to provide a high voltage self-starting permanent magnet synchronous motor to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-voltage self-starting permanent magnet synchronous motor, comprising a permanent magnet synchronous motor, a high-voltage self-starting frequency converter, a heat dissipation cavity and a heat dissipation cover, wherein the high-voltage self-starting frequency converter is installed above the permanent magnet synchronous motor, the heat dissipation cavity is arranged on the front side of the permanent magnet synchronous motor, the permanent magnet synchronous motor comprises a rotating shaft, a fan blade is fixed to the outer side of the front end of the rotating shaft, and the heat dissipation cover is fixedly installed on the front side of the heat dissipation cavity; through holes are arranged on the left and right sides of the heat dissipation cover, a sliding rod is fixed on the inner wall of the through hole, sleeves are arranged on the left and right sides of the front end of the heat dissipation cavity, and the sleeves are inserted into the through holes, a hole is arranged inside the sleeve, and the sliding rod is slidably connected to the hole, a connecting rod is fixed to the front end of the rotating shaft, an elastic telescopic joint is fixed to the front end of the connecting rod, a heat dissipation net is fixed to the inner wall of the heat dissipation cover, and the front end of the elastic telescopic joint is connected to a bearing on one side of the heat dissipation net.

[0005] The present invention further illustrates that a brush plate is fixed to the outer side of the front end of the elastic expansion joint, and four brush rods are fixed around the brush plate; a track is fixedly installed on the inner wall of the heat dissipation cover, and a slider is slidably connected inside the track, and fan teeth are fixed to the outer side of the front end of the connecting rod, a plurality of tooth blocks are arranged at the lower end of the slider, and the tooth blocks are meshed with the fan teeth, a sphere is fixed above the slider, and an extrusion rod is fixed to the inner wall of the heat dissipation cover, the lower end of the extrusion rod is spherical, and the sphere contacts the spherical part of the lower end of the extrusion rod after moving.

[0006] The present invention further illustrates that an air pressure chamber is fixed on the left side of the inner wall of the heat dissipation cover, an air pressure plate is slidably connected to the inner wall of the air pressure chamber, and the right side of the air pressure plate is fixedly connected to the left side of the slider; the left side of the air pressure plate is spring-connected to the left side of the inner wall of the air pressure chamber, and an impact rod is fixedly installed on the right side of the slider, and the right end of the impact rod is in contact with the inner wall of the heat dissipation cover.

[0007] The present invention further describes that an elastic spring is arranged inside the elastic expansion joint.

[0008] The present invention further describes that an exhaust pipe is connected to the left side of the air pressure chamber and the interior of the permanent magnet synchronous motor, and a one-way valve 1 is arranged inside the exhaust pipe. An exhaust pipe is connected to the left side of the air pressure chamber and the connection between the heat dissipation chamber and the heat dissipation cover, and a one-way valve 2 is arranged inside the exhaust pipe.

[0009] The present invention further describes that two push rods are fixed to the front side of the sector teeth, and the push rods are in contact with the brush disc.

[0010] The present invention further illustrates that a voltage self-regulating module is provided inside the high-voltage self-starting frequency converter, and the voltage self-regulating module is used to automatically adjust the voltage according to the torque of the output part of the permanent magnet synchronous motor; the specific operation mode is: U is the output voltage of the permanent magnet synchronous motor, U max is the maximum output voltage of the permanent magnet synchronous motor, F is the real-time torque of the permanent magnet synchronous motor, and F max It is the maximum torque that a permanent magnet synchronous motor can withstand.

[0011] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention can start the motor smoothly by starting the motor through the high-voltage self-starting frequency converter, improve the working efficiency and reduce the loss in the operation of the equipment, and can accurately control the speed and operation state of the motor by adjusting the frequency and voltage, so as to avoid the motor overload and overload operation, and ensure the safety and stability of the equipment operation. When the permanent magnet synchronous motor is running, the rotating shaft rotates, driving the fan blades to rotate at a high speed, and the internal heat is discharged through the heat dissipation network. At the same time, the heat inside the permanent magnet synchronous motor can also be discharged through the gap between the heat dissipation cover and the heat dissipation cavity, and the heat dissipation effect is greatly improved;

[0012] When the motor is running, the sliding rod of the heat dissipation cover slides forward along the inner wall of the sleeve, the gap between the heat dissipation cover and the heat dissipation cavity increases, and the heat dissipation performance is enhanced. At the same time, the heat dissipation cover pulls the elastic expansion joint to extend, and the elastic expansion joint is deformed under force. After that, when the ball is out of contact with the extrusion rod, the elastic expansion joint is reset, so that the gap becomes smaller again, and the heat dissipation cover moves back and forth in a reciprocating manner, which can not only enhance the heat dissipation performance, but also effectively prevent dust from entering the permanent magnet synchronous motor to damage the motor;

[0013] During the heat dissipation process, the impact rod quickly hits the inner wall of the heat dissipation cover, which can shake off the dust on the heat dissipation net. At the same time, due to the reverse extrusion and friction of the sphere on the extrusion rod, the force on the slider is buffered, avoiding excessive impact force to cause large vibration and accelerate the demagnetization of the permanent magnet synchronous motor, thus playing a buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the installation position of the fan blades of the present invention;

[0017] Figure 3 It is a structural plan view of the heat dissipation cover and the heat dissipation cavity of the present invention;

[0018] Figure 4 It is a schematic diagram of the internal structure of the heat dissipation cover and the heat dissipation cavity of the present invention;

[0019] Figure 5 It is a schematic diagram of the internal structure of the air pressure chamber of the present invention;

[0020] Figure 6 It is a schematic diagram of the internal structure of the track of the present invention;

[0021] In the figure: 1, heat dissipation cavity; 2, heat dissipation cover; 21, through hole; 22, sliding rod; 23, sleeve; 24, heat dissipation net; 25, track; 251, slider; 252, sphere; 253, impact rod; 26, extrusion rod; 27, air pressure cavity; 271, air pressure plate; 272, exhaust pipe; 273, exhaust pipe; 3, rotating shaft; 31, fan blade; 32, connecting rod; 321, fan tooth; 322, push rod; 33, elastic expansion joint; 331, brush plate; 332, brush rod. DETAILED DESCRIPTION

[0022] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-6The present invention provides a technical solution: a high-voltage self-starting permanent magnet synchronous motor, comprising a permanent magnet synchronous motor, a high-voltage self-starting frequency converter, a heat dissipation cavity 1 and a heat dissipation cover 2, wherein the high-voltage self-starting frequency converter is installed above the permanent magnet synchronous motor, the heat dissipation cavity 1 is arranged at the front side of the permanent magnet synchronous motor, the permanent magnet synchronous motor comprises a rotating shaft 3, a fan blade 31 is fixed to the outer side of the front end of the rotating shaft 3, and the heat dissipation cover 2 is fixedly installed at the front side of the heat dissipation cavity 1;

[0024] Through holes 21 are provided on both sides of the heat dissipation cover 2, and a slide bar 22 is fixed to the inner wall of the through hole 21. Sleeves 23 are provided on the left and right sides of the front end of the heat dissipation cavity 1, and the sleeves 23 are inserted into the through holes 21. Holes are provided inside the sleeves 23, and the slide bar 22 is slidably connected in the holes. A connecting rod 32 is fixed to the front end of the rotating shaft 3, and an elastic expansion joint 33 is fixed to the front end of the connecting rod 32. A heat dissipation net 24 is fixed to the inner wall of the heat dissipation cover 2, and the front end of the elastic expansion joint 33 is connected to a bearing on one side of the heat dissipation net 24;

[0025] The power supply of the permanent magnet synchronous motor is connected to the high-voltage self-starting frequency converter, and the required operating parameters and control mode are set through the control panel or controllers such as PLC. The high-voltage self-starting frequency converter will convert the frequency and voltage of the power supply into the frequency and voltage required by the permanent magnet synchronous motor according to the input parameters, and start the permanent magnet synchronous motor. After the permanent magnet synchronous motor is started, the frequency and voltage are adjusted by the high-voltage self-starting frequency converter to control the speed of the motor. When acceleration is required, the frequency and voltage can be gradually increased to gradually increase the speed of the permanent magnet synchronous motor, thereby achieving acceleration and starting. Starting the motor through the high-voltage self-starting frequency converter can make the motor start smoothly, improve work efficiency and reduce losses during equipment operation. By adjusting the frequency and voltage, the speed and operating state of the motor can be accurately controlled to avoid motor overload and overload operation, and ensure the safety and stability of equipment operation. When the permanent magnet synchronous motor is running, the shaft 3 rotates, driving the fan blades 31 to rotate at high speed, and the internal heat is discharged through the heat dissipation net 24. At the same time, the heat inside the permanent magnet synchronous motor can also be discharged through the gap between the heat dissipation cover 2 and the heat dissipation cavity 1, and the heat dissipation effect is greatly improved.

[0026] A brush plate 331 is fixed to the outer side of the front end of the elastic expansion joint 33, and four brush rods 332 are distributed and fixed around the brush plate 331;

[0027] A track 25 is fixedly mounted on the inner wall of the heat dissipation cover 2, a slider 251 is slidably connected inside the track 25, a fan tooth 321 is fixed to the outer side of the front end of the connecting rod 32, a plurality of tooth blocks are arranged at the lower end of the slider 251, and the tooth blocks are meshed with the fan teeth 321, a ball 252 is fixed above the slider 251, an extrusion rod 26 is fixed to the inner wall of the heat dissipation cover 2, the lower end of the extrusion rod 26 is spherical, and the ball 252 contacts the spherical part of the lower end of the extrusion rod 26 after moving;

[0028] When the rotating shaft 3 rotates, the elastic expansion joint 33 is driven to rotate through the connecting rod 32, and the elastic expansion joint 33 drives the brush rod 332 to rotate around the center through the brush plate 331, so as to roll and brush the heat dissipation net 24, brush off the dust attached to the heat dissipation net 24, and ensure the heat dissipation effect;

[0029] At the same time, when the connecting rod 32 rotates, the fan teeth 321 are driven to rotate. The fan teeth 321 drive the slider 251 to slide to the left along the track 25 through meshing. The slider 251 drives the ball 252 to move. The ball 252 and the lower end of the extrusion rod 26 squeeze and rub against each other, and the heat dissipation cover 2 moves forward by pushing the extrusion rod 26. The slide bar 22 of the heat dissipation cover 2 slides forward along the inner wall of the sleeve 23, and the gap between the heat dissipation cover 2 and the heat dissipation cavity 1 increases, and the heat dissipation performance is enhanced. At the same time, the heat dissipation cover 2 pulls the elastic expansion joint 33 to extend, and the elastic expansion joint 33 is deformed by force. After that, when the ball 252 is out of contact with the extrusion rod 26, the elastic expansion joint 33 is reset, so that the gap becomes smaller again, and the heat dissipation cover 2 moves back and forth in a reciprocating manner, which can not only enhance the heat dissipation performance, but also effectively prevent dust from entering the permanent magnet synchronous motor and damaging the motor.

[0030] A pressure chamber 27 is fixed to the left side of the inner wall of the heat dissipation cover 2, a pressure plate 271 is slidably connected to the inner wall of the pressure chamber 27, and the right side of the pressure plate 271 is fixedly connected to the left side of the slider 251;

[0031] The left side of the air pressure plate 271 is connected to the left side of the inner wall of the air pressure chamber 27 by a spring, and the right side of the slider 251 is fixedly mounted with a striking rod 253, and the right end of the striking rod 253 contacts the inner wall of the heat dissipation cover 2;

[0032] When the slider 251 moves to the left, it drives the air pressure plate 271 to slide to the left along the inner wall of the air pressure chamber 27, and the spring is deformed by the force. At the same time, the slider 251 drives the impact rod 253 to disengage from the inner wall of the heat dissipation cover 2, and then the fan teeth 321 disengage from the slider 251. The spring generates a reaction force to make the air pressure plate 271 quickly reset, thereby driving the impact rod 253 to quickly hit the inner wall of the heat dissipation cover 2, which can shake off the dust on the heat dissipation net 24. At the same time, due to the reverse extrusion of the ball 252 on the friction extrusion rod 26, the force on the slider 251 is buffered, avoiding excessive impact force to cause large vibration and accelerate the demagnetization of the permanent magnet synchronous motor, thereby playing a buffering role.

[0033] An elastic spring is arranged inside the elastic expansion joint 33;

[0034] The elastic expansion joint 33 is reset after being extended. At this time, the impact rod 253 hits the inner wall of the heat dissipation cover 2. The reaction force generated by the elastic spring in the elastic expansion joint 33 causes the extrusion rod 26 to reset quickly. Its elasticity can further reduce the vibration intensity and enhance the shock absorption effect.

[0035] The left side of the air pressure chamber 27 is connected to the interior of the permanent magnet synchronous motor with an exhaust pipe 272, and a one-way valve 1 is arranged inside the exhaust pipe 272. The left side of the air pressure chamber 27 is connected to the connection between the heat dissipation chamber 1 and the heat dissipation cover 2 with an exhaust pipe 273, and a one-way valve 2 is arranged inside the exhaust pipe 273.

[0036] When the air pressure plate 271 slides left and right along the inner wall of the air pressure chamber 27, the heat inside the permanent magnet synchronous motor is first extracted through the exhaust pipe 272 and quickly discharged through the exhaust pipe 273, and the hot air is quickly discharged through the gap between the heat dissipation cover 2 and the heat dissipation chamber 1. When the air pressure chamber 27 is exhausted, the gap between the heat dissipation cover 2 and the heat dissipation chamber 1 is large, the exhaust effect is good, the heat can be discharged from the permanent magnet synchronous motor faster, and the heat dissipation performance is further enhanced.

[0037] Two push rods 322 are fixed to the front side of the sector teeth 321, and the push rods 322 and the brush plate 331 are in contact with each other;

[0038] After the ball 252 is out of contact with the extrusion rod 26, the elastic expansion joint 33 is quickly reset by the internal elastic spring, thereby driving the brush plate 331 to quickly reset. After the brush plate 331 is reset, it is squeezed against the push rod 322. The push rod 322 pushes the brush plate 331 to move forward slightly, thereby inserting the bristles of the brush rod 332 into the hole of the heat dissipation net 24, pushing out stubborn dust, further improving the cleaning effect, maintaining high-intensity heat dissipation at all times, and enhancing the protection performance of the permanent magnet synchronous motor.

[0039] A voltage self-regulating module is provided inside the high-voltage self-starting frequency converter, and the voltage self-regulating module is used to automatically adjust the voltage according to the torque of the output part of the permanent magnet synchronous motor;

[0040] The specific operation mode is: U is the output voltage of the permanent magnet synchronous motor, U max is the maximum output voltage of the permanent magnet synchronous motor, F is the real-time torque of the permanent magnet synchronous motor, and F max It is the highest torque that the permanent magnet synchronous motor can withstand;

[0041] The greater the torque a permanent magnet synchronous motor is subjected to, the higher its own voltage will be. On the one hand, this can drive objects to rotate smoothly and steadily. On the other hand, lowering the voltage when the torque is small can save energy.

[0042] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0043] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage self-starting permanent magnet synchronous motor, comprising a permanent magnet synchronous motor, a high-voltage self-starting frequency converter, a heat dissipation chamber (1) and a heat dissipation cover (2), characterized in that: The high-voltage self-starting frequency converter is installed above the permanent magnet synchronous motor, the heat dissipation chamber (1) is arranged on the front side of the permanent magnet synchronous motor, the permanent magnet synchronous motor comprises a rotating shaft (3), a fan blade (31) is fixed on the outer side of the front end of the rotating shaft (3), and the heat dissipation cover (2) is fixedly installed on the front side of the heat dissipation chamber (1); The heat dissipation cover (2) is provided with through holes (21) on both left and right sides, and a sliding rod (22) is fixed to the inner wall of the through hole (21). The front end of the heat dissipation cavity (1) is provided with sleeves (23) on both left and right sides, and the sleeves (23) are inserted into the through holes (21). The sleeves (23) are provided with holes inside, and the sliding rods (22) are slidably connected in the holes. The front end of the rotating shaft (3) is fixed with a connecting rod (32), and the front end of the connecting rod (32) is fixed with an elastic expansion joint (33). The inner wall of the heat dissipation cover (2) is fixed with a heat dissipation net (24), and the front end of the elastic expansion joint (33) is connected to a bearing on one side of the heat dissipation net (24).

2. A high voltage self-starting permanent magnet synchronous motor according to claim 1, characterized in that: A brush plate (331) is fixed to the outside of the front end of the elastic expansion joint (33), and four brush rods (332) are distributed and fixed around the brush plate (331); A track (25) is fixedly mounted on the inner wall of the heat dissipation cover (2), a slider (251) is slidably connected inside the track (25), a fan tooth (321) is fixed on the outer side of the front end of the connecting rod (32), a plurality of tooth blocks are arranged at the lower end of the slider (251), and the tooth blocks are meshed with the fan teeth (321), a ball (252) is fixed above the slider (251), an extrusion rod (26) is fixed on the inner wall of the heat dissipation cover (2), the lower end of the extrusion rod (26) is spherical, and the ball (252) contacts the spherical portion at the lower end of the extrusion rod (26) after moving.

3. A high voltage self-starting permanent magnet synchronous motor according to claim 2, characterized in that: A pressure chamber (27) is fixed on the left side of the inner wall of the heat dissipation cover (2), a pressure plate (271) is slidably connected to the inner wall of the pressure chamber (27), and the right side of the pressure plate (271) is fixedly connected to the left side of the slider (251); The left side of the air pressure plate (271) is connected to the left side spring of the inner wall of the air pressure chamber (27), and the right side of the slider (251) is fixedly mounted with a striking rod (253), the right end of which is in contact with the inner wall of the heat dissipation cover (2).

4. A high voltage self-starting permanent magnet synchronous motor according to claim 3, characterized in that: An elastic spring is arranged inside the elastic expansion joint (33).

5. A high voltage self-starting permanent magnet synchronous motor according to claim 4, characterized in that: An exhaust pipe (272) is connected between the left side of the air pressure chamber (27) and the interior of the permanent magnet synchronous motor, and a first check valve is provided inside the exhaust pipe (272). An exhaust pipe (273) is connected between the left side of the air pressure chamber (27) and the connection between the heat dissipation chamber (1) and the heat dissipation cover (2), and a second check valve is provided inside the exhaust pipe (273).

6. A high voltage self-starting permanent magnet synchronous motor according to claim 5, characterized in that: Two push rods (322) are fixed on the front side of the sector teeth (321), and the push rods (322) are in contact with the brush plate (331).

7. A high voltage self-starting permanent magnet synchronous motor according to claim 6, characterized in that: A voltage self-regulating module is provided inside the high-voltage self-starting frequency converter, and the voltage self-regulating module is used to automatically adjust the voltage according to the torque of the output part of the permanent magnet synchronous motor; The specific operation mode is: U is the output voltage of the permanent magnet synchronous motor, U max is the maximum output voltage of the permanent magnet synchronous motor, F is the real-time torque of the permanent magnet synchronous motor, and F max It is the maximum torque that a permanent magnet synchronous motor can withstand.

Images