Centralized control equipment for composite rotor permanent magnet synchronous motor

Abstract

The utility model discloses centralized control equipment for a composite rotor permanent magnet synchronous motor. The centralized control equipment comprises a permanent magnet synchronous motor and a driver, the number of the permanent magnet synchronous motors is multiple, the permanent magnet synchronous motors are connected in parallel, each permanent magnet synchronous motor comprises a rotating shaft, a rotor core and a cage-shaped winding, the rotating shaft is arranged in the center of the rotor core, the cage-shaped winding sleeves the outer side of the rotor core, and the rotor core is internally provided with magnetic steel grooves distributed annularly and magnetic isolation grooves communicated with the magnetic steel grooves. Magnetic steel is installed in the magnetic steel groove, and a magnetic isolation body is installed in the magnetic isolation groove. The driver is electrically connected with the permanent magnet synchronous motors, and a V / F frequency converter is arranged in the driver, so that one driver can drive a plurality of permanent magnet synchronous motors to operate.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric motors, and in particular relates to a centralized control device for a composite rotor permanent magnet synchronous motor. Background Art

[0002] Generally speaking, permanent magnet synchronous motors are widely used as motors used in automobile fields such as electric vehicles and hybrid vehicles, and household appliances such as air conditioning devices, refrigerators, and water heaters using heat pumps. This permanent magnet synchronous motor is a synchronous motor that uses permanent magnets in the magnetic field (magnetic poles) of the rotor. Moreover, among such permanent magnet synchronous motors, embedded structural permanent magnet synchronous motors in which permanent magnets are embedded in the rotor core are widely used. This embedded structural permanent magnet synchronous motor uses a rotor in which permanent magnets are embedded in the magnetic field, so that it can not only utilize the torque generated by the permanent magnets, but also utilize the torque (reluctance torque) caused by the asymmetry of the magnetic resistance of the magnetic field.

[0003] In equipment or working places where multiple permanent magnet synchronous motors need to run synchronously, the current solution is: the driver and the motor are connected one by one, and the synchronization card and its auxiliary devices are used to achieve this. This solution is complex, costly, and has a large power loss. Utility Model Content

[0004] In view of the above-mentioned deficiencies, the utility model provides a centralized control device for a composite rotor permanent magnet synchronous motor. When multiple permanent magnet synchronous motors are required to work simultaneously, one driver is used to simultaneously control multiple permanent magnet synchronous motors and make them run synchronously with speed regulation. It has a simple structure, low cost and low power loss.

[0005] The utility model is realized by the following technical solutions:

[0006] A centralized control device for a composite rotor permanent magnet synchronous motor includes a permanent magnet synchronous motor and a driver. There are multiple permanent magnet synchronous motors, and each permanent magnet synchronous motor is connected in parallel. The permanent magnet synchronous motor includes a rotating shaft, a rotor core and a cage winding. The rotating shaft is arranged at the center of the rotor core. The cage winding is mounted on the outside of the rotor core. The rotor core is provided with annularly distributed magnetic steel slots and magnetic isolation slots connected to the magnetic steel slots. The magnetic steel slots are provided with magnetic steels, and the magnetic isolation slots are provided with magnetic isolation bodies. The driver is electrically connected to the permanent magnet synchronous motor, and a V / F frequency converter is provided in the driver, so that one driver can drive multiple permanent magnet synchronous motors to operate.

[0007] Furthermore, a threaded groove is opened in the magnetic isolation body and a stud matching the threaded groove is provided. The stud abuts against the magnet, thereby compensating for the reduced mechanical strength of the rotor core caused by the hollowing out of the magnetic isolation groove in the rotor core. The stud is provided so that magnets of various lengths and types can be installed in the magnet groove, thereby improving the application range of the permanent magnet synchronous motor.

[0008] Furthermore, a rubber pad is attached to the side of the stud close to the magnetic steel to provide buffering protection for the stud and the magnetic steel.

[0009] Furthermore, a spring is installed in the thread groove, and the spring abuts against the stud, thereby increasing the resistance of the stud to move toward the thread groove and improving the support stability when the magnetic isolation body squeezes the magnetic steel.

[0010] Furthermore, a first semicircular hole is opened in the magnetic isolation groove, and a second semicircular hole matching the first semicircular hole is opened on the side of the magnetic isolation body close to the first semicircular hole. The self-tapping screw can be screwed into the installation hole formed by splicing the first semicircular hole and the second semicircular hole to achieve the installation and fixation of the magnetic isolation body.

[0011] Furthermore, along the circumferential direction of the rotor core, a plurality of magnetic steel slots and magnetic isolation slots are evenly distributed.

[0012] Furthermore, the driver is also provided with a carbon emission display device, which can calculate the carbon dioxide emissions of the equipment driven by the permanent magnet synchronous motor.

[0013] Furthermore, a Teflon coating is sprayed on the outer side of the rotor core. The Teflon coating has good wear resistance. Spraying the Teflon coating on the outer side of the rotor core helps to increase the rotation life of the rotor core.

[0014] Beneficial effects of the utility model:

[0015] 1. A cage winding is arranged on the outside of the rotor core, and the torque generated by the cage damping winding is used to synchronize the speed of each permanent magnet synchronous motor so that the back electromotive force phase is the same;

[0016] 2. One driver is used to drive multiple permanent magnet synchronous motors to operate simultaneously, and can achieve stepless speed regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A connection diagram for illustrating a schematic implementation of a permanent magnet synchronous motor in the utility model;

[0018] Figure 2 A side view for illustrating a schematic implementation of a permanent magnet synchronous motor in the utility model;

[0019] Figure 3A side view for illustrating a schematic implementation of a rotor core of a permanent magnet synchronous motor in the utility model;

[0020] Figure 4 A side view for illustrating a schematic implementation of a rotating shaft of a permanent magnet synchronous motor in the utility model;

[0021] Figure 5 A side sectional view for illustrating a schematic implementation of a magnetic isolation body of a permanent magnet synchronous motor in the utility model.

[0022] List of parts and reference numerals:

[0023] 1. Rotating shaft; 2. Rotor core; 21. Magnetic steel slot; 22. Magnetic isolation slot; 221. First semicircular hole; 23. Magnetic steel; 24. Magnetic isolation body; 241. Threaded slot; 242. Stud; 243. Rubber pad; 244. Second semicircular hole; 25. Spring; 3. Cage winding; 4. Self-tapping screw. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0026] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention are not only changes in position, but also include movements such as rotation and rolling where there is no relative change in position but a change in state.

[0027] Finally, it should be noted that when a component is referred to as being "located" or "set on" another component, it can be on the other component or there can be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there can be an intermediate component at the same time.

[0028] like Figures 1 to 5A composite rotor permanent magnet synchronous motor centralized control device is shown, comprising a permanent magnet synchronous motor and a driver. There are multiple permanent magnet synchronous motors, and each permanent magnet synchronous motor is connected in parallel. The permanent magnet synchronous motor comprises a rotating shaft 1, a rotor core 2 and a cage winding 3. The rotating shaft 1 is arranged at the center of the rotor core. The cage winding 3 is fitted to the outside of the rotor core 2. The rotor core 2 is provided with annularly distributed magnetic steel slots 21 and magnetic isolation slots 22 connected to the magnetic steel slots 21. The magnetic steel slots 21 are provided with magnetic steel 23, and the magnetic isolation slots 22 are provided with magnetic isolation bodies 24. The driver is electrically connected to the permanent magnet synchronous motor, and a V / F frequency converter is provided in the driver, so that one driver can drive multiple permanent magnet synchronous motors to operate.

[0029] In one embodiment, the present solution manufactures the rotor of the permanent magnet synchronous motor into a composite rotor core 2 , that is, a cage winding 3 is arranged on the outer side of the rotor core 2 .

[0030] The function of the cage winding is to allow the rotor core 2 to generate additional torque. When multiple permanent magnet synchronous motors are operated in parallel, the initial positions of the rotor core 2 of each permanent magnet synchronous motor are different, and the phase of the back electromotive force generated by the magnetic steel 23 during the startup operation is also different. The frequency converter cannot meet the input feedback requirements of each permanent magnet synchronous motor at the same time. When the speed of the stator rotating magnetic field is higher or lower than the speed of the rotor core 2, that is, the two are not "synchronous", an induced current will be generated in the cage winding, and the torque generated by the induced current will "pull" the rotor core 2 back to the operating state with the same speed and phase as the stator rotating magnetic field. In this way, the driver is equivalent to only one power supply, which can drive multiple permanent magnet synchronous motors at the same time, and changing the frequency can change the synchronous speed of the motor. Using a V / F frequency converter, multiple permanent magnet synchronous motors can be controlled at the same time.

[0031] In one embodiment, a magnetic isolation body 24 is embedded in the hollow magnetic isolation groove 22 of the rotor core 2, and the magnetic isolation body 24 abuts against one surface of the magnetic steel 23 to fix the magnetic steel 23. By changing the size of the magnetic isolation body 24, the rotor core 2 can be adapted to magnetic steels 23 of various lengths.

[0032] Preferably, a threaded groove 241 is opened in the magnetic isolation body 24 and a stud 242 that cooperates with the threaded groove 241 is provided. The stud 242 abuts against the magnet 23 to compensate for the deficiency of reduced mechanical strength of the rotor core 2 caused by the hollowing out of the magnetic isolation groove 22 in the rotor core 2. The stud 242 is provided so that magnets 23 of various lengths and types can be installed in the magnet groove 21, thereby improving the application range of the permanent magnet synchronous motor.

[0033] In one embodiment, magnets 23 of various lengths can be installed in the rotor core 2. During installation, the magnets 23 are first installed in the magnet slots 21, the distance between the magnets 23 and the magnetic isolation slots 22 is measured, and then the studs 242 are screwed to adjust the length of the entire magnetic isolation body 24. The magnetic isolation body 24 is installed in the magnetic isolation slots 22 so that the magnetic isolation body 24 abuts against the magnets 23 to form a support for the magnets 23. That is, in the same rotor core 2, by selecting magnets 23 of different lengths, the power performance of the permanent magnet synchronous motor can be adjusted.

[0034] Preferably, a rubber pad 243 is also attached to the side of the stud 242 close to the magnetic steel 23 to provide buffering protection for the stud 242 and the magnetic steel 23 .

[0035] Preferably, a spring 25 is installed in the thread groove 241 , and the spring 25 abuts against the stud 242 , thereby increasing the resistance of the stud 242 moving toward the thread groove 241 , and improving the support stability when the magnetic isolation body 24 squeezes the magnetic steel 23 .

[0036] Preferably, a first semicircular hole 221 is provided in the magnetic isolation groove 22, and a second semicircular hole 244 matching the first semicircular hole 221 is provided on one side of the magnetic isolation body 24 close to the first semicircular hole 221, and the self-tapping screw 4 can be screwed into the mounting hole formed by splicing the first semicircular hole 221 and the second semicircular hole 244, so as to realize the installation and fixation of the magnetic isolation body 24. The magnetic isolation body 24 presses the magnetic steel 23 toward the outer side of the rotor core 2 in the circumferential direction of the rotor core 2, thereby eliminating the assembly gap generated by installing the magnetic steel 23.

[0037] Preferably, along the circumferential direction of the rotor core 2 , a plurality of magnetic steel slots 21 and magnetic isolation slots 22 are evenly distributed.

[0038] Preferably, the driver is also provided with a carbon emission display device, which can calculate the carbon dioxide emissions of the equipment driven by the permanent magnet synchronous motor.

[0039] Preferably, the outer side of the rotor core 2 is sprayed with a Teflon coating, which has good wear resistance. Spraying the Teflon coating on the outer side of the rotor core 2 helps to increase the rotation life of the rotor core 2.

[0040] When the above-mentioned composite rotor permanent magnet synchronous motor centralized control device is used, when multiple permanent magnet synchronous motors need to work simultaneously, one driver is used to simultaneously control multiple permanent magnet synchronous motors and make them run synchronously with speed regulation, which has a simple structure, low cost and low power loss.

[0041] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A centralized control device for a composite rotor permanent magnet synchronous motor, characterized in that: include: A permanent magnet synchronous motor, wherein a plurality of permanent magnet synchronous motors are provided and each of the permanent magnet synchronous motors is connected in parallel, wherein the permanent magnet synchronous motor comprises a rotating shaft, a rotor core and a cage winding, wherein the rotating shaft is arranged at the center of the rotor core, the cage winding is sleeved to the outside of the rotor core, the rotor core is provided with annularly distributed magnetic steel slots and magnetic isolation slots connected to the magnetic steel slots, the magnetic steel slots are installed with magnetic steel, and the magnetic isolation slots are installed with magnetic isolation bodies; A driver is electrically connected to the permanent magnet synchronous motor, and a V / F frequency converter is provided in the driver.

2. A composite rotor permanent magnet synchronous motor centralized control device according to claim 1, characterized in that: The magnetic isolation body is provided with a thread groove and a stud matched with the thread groove, and the stud abuts against the magnetic steel.

3. A composite rotor permanent magnet synchronous motor centralized control device according to claim 2, characterized in that: A rubber pad is also attached to one side of the stud close to the magnetic steel.

4. The centralized control device for a composite rotor permanent magnet synchronous motor according to claim 2, characterized in that: A spring is installed in the thread groove, and the spring abuts against the stud.

5. The centralized control device for a composite rotor permanent magnet synchronous motor according to claim 1, characterized in that: A first semicircular hole is provided in the magnetic isolation groove, and a second semicircular hole matching with the first semicircular hole is provided on a side of the magnetic isolation body close to the first semicircular hole. A self-tapping screw can be screwed into the mounting hole formed by the first semicircular hole and the second semicircular hole.

6. The centralized control device for a composite rotor permanent magnet synchronous motor according to claim 1, characterized in that: Along the circumferential direction of the rotor core, a plurality of magnetic steel slots and magnetic isolation slots are evenly distributed.

7. The centralized control device for a composite rotor permanent magnet synchronous motor according to claim 1, characterized in that: The driver is also provided with a carbon emission display device.

8. The centralized control device for a composite rotor permanent magnet synchronous motor according to claim 1, characterized in that: The outer side of the rotor core is sprayed with a Teflon coating.

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