CN203722446U - Permanent-magnet synchronous motor - Google Patents

Abstract

The utility model relates to a permanent magnet synchronous motor, which includes a stator and a rotor, wherein the cross section of the stator teeth is basically bow-shaped, and has three slots, each of which is open, and the circumferentially adjacent stator teeth are formed by two The center line between them is installed on the inner circumference of the stator yoke in a symmetrical manner to form the stator core. An even number of permanent magnet slots are uniformly arranged on the rotor core, and each permanent magnet slot is symmetrically distributed on each rotor magnetic pole with respect to each rotor d-axis, and is bounded by the q-axis q, wherein each permanent magnet The half of the permanent magnet slot on the left side of the d-axis is connected to form an N shape, and the half of the permanent magnet slot on the right side of the d-axis is symmetrical and connected to the d-axis of the rotor pole with respect to the d-axis of the rotor pole. The permanent magnets are filled such that the poles NS present on each rotor pole are staggered. The permanent magnet synchronous motor of the utility model reduces iron loss and copper loss, saves binding time and improves motor efficiency.

Description

A permanent magnet synchronous motor

technical field

The utility model relates to a motor, in particular to a permanent magnet synchronous motor. the

Background technique

The excitation source of permanent magnet synchronous motor is permanent magnet, which has simple structure, high power density and relatively small volume. In particular, the permanent magnet synchronous motor with a permanent magnet embedded rotor has a strong overload capacity and is more widely used because of its salient pole effect. However, since the d-axis reluctance of the permanent magnet synchronous motor with salient pole effect is greater than the q-axis reluctance, and the d-axis synchronous reactance is smaller than the q-axis synchronous reactance, there is a greater risk of demagnetization of the permanent magnet during load operation. In addition, when the load is running, the quadrature axis magnetic circuit is saturated, the iron loss is large, and the efficiency of the motor is not high. the

The stator of the three-phase motor in the prior art usually adopts the distributed winding method to wind the iron core, and all the windings are on the circumference of the same radius. Therefore, the length of the end of the winding protruding from the iron core needs to be long enough to avoid crossing other windings . When the protruding length of the coil end increases, the amount of copper used will increase, which not only consumes copper material, but also consumes electric energy, and the copper loss is large, which affects the efficiency of the motor. On the other hand, since the coils at the ends protrude longer, in order to fix the coils at the ends, they need to be bound manually, which greatly reduces the production efficiency. the

Utility model content

The purpose of the utility model is to provide a permanent magnet synchronous motor which greatly reduces demagnetization, iron loss and copper loss to improve production efficiency in view of the problems existing in the prior art. the

In order to achieve the above object, the permanent magnet synchronous motor of the present utility model includes a stator and a rotor. The stator includes a stator yoke and stator teeth connected with the stator yoke as a whole. The cross section of the stator yoke is circular, and the stator teeth are Distributed on the inner periphery of the stator yoke, the cross section of the stator teeth is basically bow-shaped, with a first slot, a second slot, and a third slot, each slot is open, and the circumferentially adjacent stator teeth are The center line between the two is installed on the inner circumference of the stator yoke in a symmetrical manner, that is, it is installed in a manner of alternating bows and reverse bows to form a stator core. The top ends of the stator teeth are not connected to each other, so that There is a gap between the stator teeth, and the three-phase coils are respectively wound in the above three slots without interfering with each other.

Preferably, the rotor is a permanent magnet embedded rotor, the rotor includes a rotor core, rotor guide bars are evenly distributed on the outer edge of the rotor core, and an even number of permanent magnet slots are uniformly arranged on the rotor core, each of the permanent magnets The magnet slots are symmetrically distributed on each rotor pole with respect to the rotor pole d-axis, and are bounded by the rotor pole q-axis, wherein each permanent magnet slot is divided into three permanent magnet slots located on the left side of the rotor pole d-axis. The broken line segment is connected in an N shape, and the half permanent magnet slot on the right side of the d-axis of the rotor pole is symmetrical with the half permanent magnet slot on the left side of the d-axis of the rotor pole, and is symmetrical with the half permanent magnet slot on the left side of the d-axis The slots are connected, and the permanent magnet slots are filled with permanent magnets, so that the magnetic poles NS present on each rotor pole are staggered.

The utility model further increases the magnetic flux density of the magnetic poles of the rotor due to the adoption of the above-mentioned technical scheme. Since the magnetic flux density close to the d-axis is far greater than the magnetic flux density of the q-axis, the magnetic field distribution in the air gap can be closer to sinusoidal waves, which further reduces the content of high-order harmonics, and the q-axis magnetic flux density is small, which also reduces the risk of q-axis magnetic flux saturation and reduces iron loss. At the same time, because the utility model adopts the above-mentioned technical solution, overlapping and binding of stator windings are avoided, thereby reducing the usage of windings, further reducing copper loss, improving motor efficiency and saving binding time. the

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model. the

Figure 1 is a sectional view of a stator of a permanent magnet synchronous motor;

Fig. 2 is a structural diagram of a stator tooth of a permanent magnet synchronous motor;

Fig. 3 is the structural representation of the permanent magnet synchronous motor rotor;

In the figure, 10, stator teeth; 11, stator yoke; 101, first slot of stator teeth 102, second slot of stator teeth; 103, third slot of stator teeth; 21, rotor bar; 22, permanent magnet slots.

Detailed ways

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model. the

As shown in Figure 1 and Figure 2, the permanent magnet synchronous motor of the present invention includes a stator and a rotor. The stator includes a stator yoke 11 fixedly connected with the stator teeth 10 as a whole, the cross section of the stator yoke is circular, and the stator teeth 10 are installed on the inner periphery of the stator yoke. The cross section of the stator tooth 10 is basically bow-shaped, with a first slot 101, a second slot 102, and a third slot 103, each slot is in an open shape, which is convenient for coil winding, because the bow-shaped stator tooth 10 has Natural concave-convex structure, the coil is not easy to fall off. Circumferentially adjacent stator teeth 10 are installed on the inner periphery of the stator yoke 11 in a manner symmetrical to the center line between the two, that is, installed in a manner of alternately distributing forward bow and reverse bow to form a stator core. The top ends of the stator teeth 10 are not connected to each other to leave a gap between the stator teeth. The three-phase coils 12 are respectively wound in the above-mentioned three slots without interfering with each other, so the ends of the windings do not need to deliberately reserve a longer length. the

Due to the use of bow-shaped stator teeth, overlapping and binding of stator windings are avoided, thereby reducing the amount of windings used, thereby reducing copper loss, improving motor efficiency and saving binding time. the

Referring to Fig. 3, the rotor of the permanent magnet synchronous motor of the present utility model is a permanent magnet embedded rotor, and rotor guide bars 21 are evenly distributed on the outer edge of the rotor core, and an even number of permanent magnet slots 22 are uniformly arranged on the rotor core, Each of the permanent magnet slots 22 is distributed symmetrically with respect to each rotor d-axis on each rotor pole, and is bounded by the q-axis q, wherein each of the permanent magnet slots is located on the left half of the d-axis. Divided into three broken line segments, connected to form an N shape, the half permanent magnet slot on the right side of the d-axis and the half permanent magnet slot on the left are symmetrical with respect to the d-axis of the rotor magnetic pole, and communicate with the half permanent magnet slot on the left side of the d-axis, The permanent magnet slots 22 are filled with permanent magnets, so that the magnetic poles NS present on each rotor pole are arranged alternately. the

Due to the permanent magnet slot with the above structure, the magnetic flux density near the d-axis is much larger than that of the q-axis, which can make the magnetic field distribution in the air gap closer to a sine wave, further reducing the content of high-order harmonics, The q-axis magnetic flux density is small, which also reduces the risk of q-axis magnetic flux saturation and reduces iron loss. the

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model. the

Claims (2)

1. a permanent magnet synchronous motor, comprise stator and rotor, it is characterized in that, the stator tooth that described stator comprises stator yoke and connects as one with stator yoke, described stator yoke cross section is annular, stator tooth is distributed on the interior week of described stator yoke, described stator tooth cross section is bow font substantially, there is the first groove, the second groove, and three-flute, each groove is all uncovered shape, circumferentially adjacent stator tooth is arranged on the interior week of stator yoke in the mode of the center line symmetry between the two, just to bend font and instead to bend the alternatively distributed mode of font and install, the top of described stator tooth does not connect mutually, to reserve space between described stator tooth, three-phase coil is wound on respectively in above-mentioned three grooves without interfering with each other.

2. a kind of permanent magnet synchronous motor according to claim 1, it is characterized in that, described rotor is permanent magnet submerged formula rotor, rotor includes rotor core, uniform rotor bar in the outer rim of rotor core, in rotor core, be evenly provided with even number permanent magnet trough, each described permanent magnet trough is symmetrical with respect to place rotor magnetic pole d axis on each rotor magnetic pole, and taking rotor magnetic pole q axis as boundary, wherein said each permanent magnet trough is positioned at half permanent magnet trough on the rotor magnetic pole d axis left side and divides three broken lines, be communicated with for N shape, half permanent magnet trough on rotor magnetic pole d axis the right and half permanent magnet trough on the rotor magnetic pole d axis left side are with respect to the d axis symmetry of rotor magnetic pole, and be communicated with half permanent magnet trough on the d axis left side, in described permanent magnet trough, fill permanent magnet, the magnetic pole NS presenting on each rotor pole is staggered.