Double-stator disc type permanent magnet synchronous motor

Abstract

A double-stator disc type permanent magnet synchronous motor relates to a synchronous motor and comprises stators (1), radiation magnetic rings (2) and stator windings (3). The radiation magnetic ring is an integral magnetic ring made of sintered neodymium iron boron materials and is fixed on a main end cover of the disc type motor, and the main end cover is installed on a rotating shaft of the disc type motor and serves as a rotor part of the disc type motor. The permanent magnet synchronous disc type motor with the double-stator structure can effectively reduce the noise and vibration of the motor and improve the stability of the motor. Radiation magnetizing and multi-pole magnetizing according to a certain angle can be performed on the inner surface and the outer surface of the whole magnetic ring, and a transition area between magnetic poles is small, so that the performance of the motor can be remarkably improved. The surface magnetism of the multi-stage magnetic ring is distributed in a sine wave form, and the ultrahigh magnetic field can greatly improve the efficiency of the motor, so that the motor is light and miniaturized.

Description

Technical Field

[0001] The utility model relates to a synchronous motor, in particular to a double-stator disc permanent magnet synchronous motor. Background Art

[0002] The air gap of a disc permanent magnet motor (i.e., an axial permanent magnet motor) is planar, and the air gap magnetic field is distributed axially. The world's first motor invented by Faraday was an axial motor. Due to limitations in materials and process levels, axial permanent magnet motors did not see further development for a long time afterwards. With the progress of science and technology, the emergence of new materials and the improvement of process levels, in order to overcome problems such as low iron core utilization rate and difficult cooling existing in traditional cylindrical motors, axial permanent magnet motors have regained attention. Currently, axial permanent magnet motors have become a research hotspot in the motor field due to their advantages in aspects such as power density and efficiency.

[0003] The stator and rotor of a disc permanent magnet motor are arranged and distributed axially. The stator is convenient to use new materials such as thin silicon steel sheets, soft magnetic composite materials, and amorphous alloys, and various structural forms have been derived. For example, one stator and one rotor (single-sided air gap), two rotors with one stator in the middle (double-sided air gap), two stators with one rotor in the middle (double-sided air gap), multiple stators and multiple rotors interspersed with each other (multi-sided air gap).

[0004] Due to the special structure of the double-stator disc permanent magnet synchronous motor, a higher power density can be obtained within the same size, thereby achieving more efficient energy conversion and being able to be independently controlled.

[0005] Compared with a conventional double-stator motor, the double-stator motor with a rotor structure has a yoke and magnetic steel, the rotor has a larger mass and a larger moment of inertia, and the motor has insufficient fast response ability. Summary of the Invention

[0006] The purpose of the utility model is to provide a double-stator disc permanent magnet synchronous motor. The utility model uses a non-magnetic yoke radiation ring to effectively reduce the noise and vibration of the motor, improve the stability of the motor. The inner and outer surfaces of the magnetic ring are magnetized by radiation and multi-polar magnetization at a certain angle, and the transition area between magnetic poles is small, making the motor lightweight and miniaturized, and can significantly improve the performance of the motor; while utilizing the internal space of the stator, the moment of inertia is smaller, and the motor has better fast response ability.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A double-stator disc-type permanent magnet synchronous motor, the motor comprising a stator, a radially magnetized ring, and a stator winding; the radially magnetized ring is the rotor structure of the double-stator disc-type motor, which is disc-shaped and fixed to the main end cover of the disc-type motor. The stator end covers are located on both sides of the main end cover and are respectively used to fix the front and rear stators. Each stator is provided with stator slots, and each stator slot is provided with a stator winding having a fixed number of turns.

[0009] For the described double-stator disc-type permanent magnet synchronous motor, the stator cores have the same size, the same number of slots and are evenly distributed, and the slot shapes are the same.

[0010] For the described double-stator disc-type permanent magnet synchronous motor, the number of turns of the stator windings is the same.

[0011] For the described double-stator disc-type permanent magnet synchronous motor, the stator part and the rotor part are columnar rings with the same inner and outer diameters.

[0012] For the described double-stator disc-type permanent magnet synchronous motor, there is a layer of air gap with the same thickness between the two stators and the radially magnetized ring respectively.

[0013] For the described double-stator disc-type permanent magnet synchronous motor, the two stators and the radially magnetized ring are jointly installed on the rotating shaft for output, and the stator cores are all made of silicon steel material.

[0014] For the described double-stator disc-type permanent magnet synchronous motor, the rotor consists of a radially magnetized ring, the radial magnetization direction is axial, and the radially magnetized ring is made of neodymium iron boron material.

[0015] For the described double-stator disc-type permanent magnet synchronous motor, the two stators and the radially magnetized ring are jointly installed on the rotating shaft for output, the stator cores are all made of silicon steel material, and a servo synchronous control method is adopted to control the frequency of stamping and the speed of winding, and the consistency from the inner diameter to the outer diameter.

[0016] The beneficial effects of the present utility model are:

[0017] 1. The non-magnetic yoke radiation ring adopted by the present utility model is more advanced, which can effectively reduce the noise and vibration of the motor and improve the stability of the motor. Since the inner and outer surfaces of the entire magnetic ring can be radially magnetized and multi-pole magnetized at a certain angle, the transition area between the magnetic poles is small, making the motor lightweight and miniaturized, so the performance of the motor can be significantly improved.

[0018] 2. The present utility model consists of two stator discs sandwiching a rotor disc to form a double air-gap structure, so that the magnetic flux returns to the starting magnetic pole through a symmetrical path to form a closed magnetic circuit. The rotor part does not need to use ferromagnetic materials, so the rotor has a light mass and the motor has a small moment of inertia.

[0019] 3. Compared with single-stator motors, double-stator motors have higher efficiency, with smaller current losses and lower mechanical losses compared to traditional motors. By optimizing the interaction between the magnetic field and the conductor, double-stator motors can more effectively convert electrical energy into mechanical energy. When the double-stator structure is applied to a disc motor, due to the short axial length of the disc motor, this feature can be fully utilized to save space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a top view structural schematic diagram of the utility model;

[0021] Figure 2 is a front view structural schematic diagram of the utility model;

[0022] Figure 3 is a side view structural schematic diagram of the utility model;

[0023] Figure 4 is a three-dimensional structural schematic diagram of the utility model.

[0024] In the figure: 1, stator; 2, radiation magnetic ring; 3, stator winding. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Reference Figures 1-4 The present utility model provides a disc permanent magnet synchronous motor with a double-stator structure, which mainly consists of a stator 1, a radiation magnetic ring 2, and a stator winding 3.

[0027] The radiation magnetic ring serves as the rotor structure of the double-stator disc motor, enabling the stator winding 3 to have a very high heat dissipation efficiency. Its shape is disc-shaped and it is installed between the two stators 1. Stator cores with stator slots are provided at both ends and are fixed on the end covers. A stator winding with a fixed number of turns is arranged in each stator slot.

[0028] The number of slots in the stator cores on both sides is equal and evenly distributed, the slot shapes are the same, and the number of turns of the stator winding 3 is the same, which improves the torque density and cancels out the magnetic pulling forces of the cores on the left and right sides, solving the problem of unbalanced axial forces.

[0029] The stator part and the rotor part are columnar rings with the same inner and outer diameters. There is a layer of air gap with the same thickness between the two stators 1 and the radiation magnetic ring 2, which prevents mechanical friction between the rotor and the stator and ensures a higher electromagnetic conversion efficiency.

[0030] The stator 1 and the radial magnetic ring 2 are jointly installed on the rotating shaft for output. The stator core is made of silicon steel material, and a servo synchronous control system is adopted to accurately control the stamping frequency and winding speed to achieve consistent alignment from the inner diameter to the outer diameter. Since the two stators in the double-stator motor are independent of each other, their movements can be independently controlled to achieve different working tasks. For example, one stator can work at a low speed while the other stator works at a high speed. Wide working range: The structure of the double-stator motor can be designed according to needs, so it is suitable for a wide range of application scenarios, including household appliances, industrial equipment, and transportation.

[0031] The rotor part consists of a radial magnetic ring 2 with an axial radiation direction. The radial magnetic ring is made of neodymium iron boron material. Compared with the conventional double-stator motor, the double-stator motor with a radial-ring rotor structure saves the yoke and inner permanent magnet, has a lighter rotor mass, a smaller moment of inertia, and better fast response ability of the motor. The proportion of the space occupied by the rotor is smaller, and the proportion of the inner stator winding is correspondingly larger, resulting in higher motor output torque, power density, and efficiency.

[0032] Working principle: The stator winding is a double-layer winding without coupling phenomenon. When three-phase symmetric currents with the same phase are injected into the two stator windings, rotating magnetic fields can be generated respectively to have a permanent magnet effect with the rotor, jointly driving the rotor to rotate. As Figure 4 shown, each stator winding and the rotor can be regarded as a single-stator single-rotor disc motor. The two stator windings act on the same rotor together, so the double-stator motor can be equivalent to two motors working simultaneously.

Claims

1. A double-stator disc-type permanent magnet synchronous motor, characterized in that, The motor includes a stator (1), a radially magnetized ring (2), and a stator winding (3); the radially magnetized ring is a rotor structure of a double-stator disc motor, which is disc-shaped, with the radial direction being the axial direction, and the radially magnetized ring is made of neodymium iron boron material; The radially magnetized ring is installed between the two stators (1). Stator cores with stator slots are provided at both ends of the radially magnetized ring (2) and are fixed on the end covers. A stator winding (3) with a fixed number of turns is arranged in each stator slot; the number of slots in the stator cores is equal and evenly distributed, the slot shapes are the same, and the number of turns of the stator windings (3) is the same; the stator (1) part and the rotor part are cylindrical rings with the same inner and outer diameters; there is a layer of air gap with the same thickness between the two stators (1) and the radially magnetized ring (2); the two stators (1) and the radially magnetized ring (2) are jointly installed on the rotating shaft for output, and the stator cores are all made of silicon steel material; a servo synchronous control system is adopted to control the stamping frequency and winding speed to ensure the consistency from the inner diameter to the outer diameter.

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