CN104600946B - Synchronous magnetic resistance motor - Google Patents

Abstract

The invention provides a synchronous reluctance motor, which includes a rotor and a stator; the rotor is formed by connecting multiple sections of rotor cores, and two adjacent sections of rotor cores are connected positively and negatively; in the radial direction of the rotor, the Each magnetic pole is equipped with multi-layer arc permanent magnet slots, a q-axis magnetic circuit is formed between two adjacent permanent magnet slots, and permanent magnets are arranged in the permanent magnet slots; two adjacent magnetic poles of the rotor core On the contrary, the permanent magnet slots on each magnetic pole are evenly distributed on the radial circumference of the rotor; multiple rivet holes are set on the rotor core, and the centers of the rivet holes deviate from the center of the magnetic distance, which is the rotor between the magnetic poles. At the central position of the iron core, a plurality of riveting holes are evenly distributed on the radial circumference of the rotor iron core. The synchronous reluctance motor of the present invention is formed by riveting the center of the riveting hole away from the center of the magnetic distance by a certain angle, so that the same multi-section iron core is riveted in positive and negative phases, so that the connected two-section rotor cores are staggered by a certain angle, and the motor is reduced in size. vibration and noise.

Description

synchronous reluctance motor

technical field

The invention relates to the field of motors, in particular to a permanent magnet assisted synchronous reluctance motor.

Background technique

The patent No. 02120667.8 discloses a permanent magnet type rotating motor and an air conditioner using this motor, but this motor is composed of different structural iron core segments to increase the output, resulting in complicated process and high cost, and there is no Consider the problem of motor vibration and noise.

Contents of the invention

In view of the current state of the art, the purpose of the present invention is to provide a synchronous reluctance motor, in which the multi-section rotor cores of the rotor are dislocated by a certain angle, so as to reduce the torque fluctuation of the motor and reduce the vibration and noise of the motor. To achieve the above object, the technical scheme of the present invention is as follows:

A synchronous reluctance motor comprising a rotor and a stator;

The rotor is formed by connecting three sections of rotor cores, and the two adjacent sections of the rotor cores are connected positively and negatively; the height of one section of the rotor core is L, and the height of the other two sections of the rotor core is Both are L/2, and the two rotor cores with a height of L/2 are arranged adjacently or alternately;

In the radial direction of the rotor, each magnetic pole of the rotor core is provided with multi-layer arc-shaped permanent magnet slots, and a q-axis magnetic circuit is formed between two adjacent layers of the permanent magnet slots, A permanent magnet is arranged in the permanent magnet slot;

Two adjacent magnetic poles of the rotor core are opposite in polarity, and the permanent magnet slots on each magnetic pole are evenly distributed on the radial circumference of the rotor;

A plurality of rivet holes are arranged on the rotor core, and the centers of the rivet holes deviate from the center of the magnetic distance, which is the center position of the rotor core between the magnetic poles, and the plurality of riveting holes are located between the magnetic poles. Evenly distributed on the radial circumference of the rotor core;

The two sections of the rotor core that are riveted with each other are staggered by an angle θ, then:

k*360/[2*LCM(Z,2P)]-2≤θ≤k*360/[2*LCM(Z,2P)]+2, where LCM(Z,2P) is the number of stator slots Z and The least common multiple of the number of rotor poles 2P, k=1, 3, 5, 7...is a positive odd number, that is, the angle at which the center of the riveting hole of the rotor core deviates from the center of the magnetic moment is θ/2.

Preferably, the center of the rivet hole deviates from the center of the magnetic pitch by an angle of 2°-7°.

Preferably, the permanent magnet is a ferrite magnet.

Preferably, the synchronous reluctance motor is a permanent magnet assisted synchronous reluctance motor with distributed winding integer slot windings.

The beneficial effects of the present invention are:

The synchronous reluctance motor of the present invention is formed by setting the center of the riveting hole at a certain angle away from the center of the magnetic spacing, so that the same multi-section iron core is riveted in positive and negative phases, so that the two connected rotor cores are staggered by a certain angle, and the manufacturing process is simple. , low cost; the multi-section rotor core of the rotor is dislocated at a certain angle, which can reduce the torque fluctuation of the motor by 75%, and reduce the vibration and noise of the motor.

Description of drawings

Fig. 1 is the synchronous reluctance motor rotor iron core structural diagram of the present invention;

Fig. 2 is a schematic diagram of the first embodiment of the rotor of the synchronous reluctance motor of the present invention;

Fig. 3 is a schematic diagram of the second embodiment of the rotor of the synchronous reluctance motor of the present invention;

Fig. 4 is a schematic diagram of the third embodiment of the rotor of the synchronous reluctance motor of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the synchronous reluctance motor of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to Figures 1 to 4, an embodiment of the synchronous reluctance motor of the present invention includes a rotor and a stator, the rotor is formed by connecting multiple rotor cores, the two adjacent rotor cores are connected positively and negatively, and the rotor consists of 2 - The rotor core mentioned in paragraph 8 is riveted.

In the radial direction of the rotor, each magnetic pole of the rotor core is provided with a multi-layer arc-shaped permanent magnet slot 3, and a q-axis magnetic circuit is formed between two adjacent layers of the permanent magnet slots 3. Permanent magnets 1 and 2 are arranged in the permanent magnet groove, and the permanent magnets 1 and 2 are ferrite magnets with low cost. The permanent magnets are mounted so that their polarity N, S are alternately arranged on the side facing the stator, thus forming multiple flux barriers.

The two adjacent poles of the rotor core have opposite polarities, and the permanent magnet slots 3 on each pole are evenly distributed on the radial circumference of the rotor; a plurality of rivet holes 5 are set on the rotor core, and the centers of the rivet holes 5 deviate from the center of the magnetic distance. The magnetic pitch center is the center position of the rotor core between the magnetic poles, and a plurality of riveting holes 5 are evenly distributed on the radial circumference of the rotor core.

The two riveted rotor cores are staggered by angle θ, then:

k*360/[2*LCM(Z,2P)]-2≤θ≤k*360/[2*LCM(Z,2P)]+2, where LCM(Z,2P) is the number of stator slots Z and The least common multiple of the number of rotor poles 2P, k=1, 3, 5, 7...is a positive odd number, that is, the angle at which the center of the riveting hole of the rotor core deviates from the center of the magnetic spacing is θ/2. In this way, the phase misalignment of harmonics and torque peaks generated by each segment of the rotor core can effectively reduce harmonics and torque fluctuations, and reduce motor vibration noise; therefore, this embodiment provides a process that is simpler to manufacture and lower in cost. A permanent magnet assisted synchronous reluctance motor solution with low vibration and noise.

As a possible implementation, the rotor is composed of two rotor cores with a height (thickness) of L, as shown in Figure 2, the first rotor core 7 and the second rotor core 2 are riveted together, the first rotor The iron core 7 and the second rotor iron core 8 are offset by an angle θ. Preferably, the angle θ/2 between the center of the rivet hole 5 and the center of the magnetic moment (q-axis) is 2°-7°. More preferably, when the above-mentioned angle is 3°, the effect is better.

As a possible implementation, the rotor is composed of three rotor cores with different heights, one of which has a height of L, and the other two have a height of L/2, as shown in Figure 3, the first The height of the three rotor cores 10 is L, the heights of the fourth rotor core 9 and the fifth rotor core 11 are both L/2, and the two rotor cores with a height of L/2 are arranged adjacently or alternately, That is, the fourth rotor core 9 and the fifth rotor core 11 are disposed on both sides of the third rotor core 10 , or the fourth rotor core 9 and the fifth rotor core 11 are disposed adjacently.

As a possible implementation manner, as shown in FIG. 4 , the rotor is composed of four sections of rotor cores whose heights are all L/2. The four-section rotor cores are respectively the sixth rotor core 12, the seventh rotor core 13, the eighth rotor core 14 and the ninth rotor core 15, and the two adjacent rotor cores pass through the offset rivets The holes are riveted and staggered by an angle θ, that is, a rotor is composed of four sections of iron core.

In the synchronous reluctance motors of the above embodiments, the rotor core is riveted with multiple sections of the same rotor core, and the same multi-section iron core is riveted in positive and negative phases by setting riveting holes at a certain angle away from the center of the magnetic spacing, so that The two connected rotor cores are staggered at a certain angle, and the magnets are made of low-cost ferrite magnets. In this way, the motor manufacturing process is relatively simple and achievable, and the cost is low; the motor cogging torque is small, and the torque fluctuation is small. The motor vibration noise is small.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (4)

1. A synchronous reluctance motor, characterized in that: Including rotor and stator; The rotor is formed by connecting three sections of rotor cores, and the two adjacent sections of the rotor cores are connected positively and negatively; the height of one section of the rotor core is L, and the height of the other two sections of the rotor core is Both are L/2, and the two rotor cores with a height of L/2 are arranged adjacently or alternately; In the radial direction of the rotor, each magnetic pole of the rotor core is provided with multi-layer arc-shaped permanent magnet slots, and a q-axis magnetic circuit is formed between two adjacent layers of the permanent magnet slots, A permanent magnet is arranged in the permanent magnet slot; Two adjacent magnetic poles of the rotor core are opposite in polarity, and the permanent magnet slots on each magnetic pole are evenly distributed on the radial circumference of the rotor; A plurality of rivet holes are arranged on the rotor core, and the centers of the rivet holes deviate from the center of the magnetic distance, which is the center position of the rotor core between the magnetic poles, and the plurality of rivet holes are in Evenly distributed on the radial circumference of the rotor core; The two sections of the rotor core that are riveted with each other are staggered by an angle θ, then: k*360/[2*LCM(Z,2P)]-2≤θ≤k*360/[2*LCM(Z,2P)]+2, where LCM(Z,2P) is the number of stator slots Z and The least common multiple of the number of rotor poles 2P, k=1, 3, 5, 7...is a positive odd number, that is, the angle at which the center of the rivet hole of the rotor core deviates from the center of the magnetic moment is θ/2. 2. The synchronous reluctance motor according to claim 1, characterized in that: The angle between the center of the rivet hole and the center of the magnetic pitch is 2°-7°. 3. The synchronous reluctance motor according to claim 1 or 2, characterized in that: The permanent magnet is a ferrite magnet. 4. The synchronous reluctance motor according to claim 1 or 2, characterized in that: the synchronous reluctance motor is a permanent magnet assisted synchronous reluctance motor with distributed coil integer slot windings.