TW201713009A - Flux switching permanent magnet motor - Google Patents

Abstract

A flux switching permanent magnet motor is provided. The flux switching permanent magnet motor includes a motor stator and motor rotator. The motor stator includes twelve stator poles. A permanent magnet is inserted in the motor stator. The magnetism of a side of a motor stator is the same as the magnetism of a side of a motor stator adjacently. The motor rotator includes a plurality of rotor poles. Wherein, the motor stator and the motor rotator meet the specific condition.

Description

Flux switching permanent magnet motor

This invention relates to a motor, and more particularly to a flux switching permanent magnet motor.

In today's high-efficiency motors, commonly known as synchronous reluctance motors, ABB's products are available on the market. This kind of motor does not need a magnet at all but has a very high efficiency, up to the industrial specifications of IE4, but the minimum motor capacity to achieve 90% efficiency also needs 7.5KW or more, which is energy-saving for small and medium-capacity motor products with power less than 1KW. It seems that the benefits are not great.

ABB continues to develop a more efficient "Permanent Magnet Assisted Synchronous Reluctance Motor" that does not require a rare permanent magnet, but which is extremely efficient and meets the IE5 level specification. However, in many electric vehicle fields that are highly automated or in need of improved endurance, there are often problems with low speed torque shortage and efficiency still to be strengthened. It seems that it is difficult to find such motors in existing high efficiency motors.

On the other hand, another quite different motor design concept has sprung up. It is derived from the fixed-rotor design of the "switched reluctance motor". In recent years, it has combined the superior characteristics of the "double salient permanent magnet motor".

As mentioned above, the motor retains the superior performance of the "switched reluctance motor" and the "double salient permanent magnet motor". The rotating part does not have any permanent magnets, and its shape is similar to that of the "switched reluctance motor". The rotor, so in a rather harsh working environment, such as working at 600 degrees Celsius, there is no need to worry about the rotor failure or the permanent magnet will demagnetize. Moreover, because of the advantages of the "double salient permanent magnet motor" and the excellent characteristics of the "conventional permanent magnet synchronous motor", the permanent magnet built in the fixed part is also easy to dissipate heat, and the problem of demagnetization of the permanent magnet in the fixed part is also Can be excluded indirectly.

However, although it has the above advantages, the characteristics and design of the motor are still stuck in academic research, and there is still a gap between the applicable goals of the industry, and it cannot be implemented.

In view of the above-mentioned problems, it is an object of the present invention to provide a flux-switching permanent magnet motor for solving the problems faced by the prior art.

In view of the above, the present invention provides a flux switching permanent magnet motor including a motor stator and a motor rotor. The motor stator has twelve stator teeth, and each of the stator teeth is provided with a permanent magnet, and one of the stator teeth has the same magnetic strength as the permanent magnet corresponding to one of the adjacent stator teeth, and the adjacent two stator teeth The pitch has a cogging. The motor rotor has a plurality of rotor poles. Among them, the motor stator and the motor rotor system comply with the following conditions: ; ; ; ; ; ;as well as Where b _m is the thickness of the permanent magnet, b _t is the 1/2 width of the stator tooth not including the permanent magnet, b _s is the width of the tooth groove, b _i is the thickness of the stator yoke of the stator tooth, b _p For the width of the rotor pole, b _h is the height of the rotor pole, R _si is the inner diameter of the motor stator, R _so is the outer diameter of the motor stator, S is the ratio of the inner and outer diameter of the motor stator, and T _s is the slot of the stator tooth The pitch, N _s is the number of slots, R _r is the diameter of the motor rotor, and R _ro is the outer diameter R _ri of the motor rotor is the inner diameter of the motor rotor.

Preferably, each of the stator teeth is coupled to the stator yoke, and each of the stator yokes corresponds to the slot.

Preferably, the portion of the permanent magnet corresponding to the stator yoke may be replaced by a non-magnetically permeable material.

Preferably, there may be an air gap between the motor stator and the motor rotor.

Preferably, the width of the air gap may be the inner diameter of the motor stator minus the outer diameter of the motor rotor.

As described above, the magnetic flux switching type permanent magnet motor of the present invention has a structural design of inserting permanent magnets into the stator teeth by 12 stator teeth and 10 rotor poles, so that the flux switching type of the present invention is forever The magnetic motor simplifies the complicated design of the conventional motor and can effectively reduce the torque and torque ripple of the conventional motor.

In order to understand the features, contents, and advantages of the present invention, and the advantages thereof, the present invention will be described in conjunction with the drawings, and the description of the embodiments will be described in detail below. The use of the present invention and the accompanying drawings are not necessarily the true proportions and precise configurations of the present invention. Therefore, the scope and configuration of the attached drawings should not be construed as limiting the scope of the invention.

The advantages and features of the present invention, as well as the technical methods of the present invention, are described in more detail with reference to the exemplary embodiments and the accompanying drawings, and the present invention may be implemented in various forms and should not be construed as limited thereby. The embodiments of the present invention, and the embodiments of the present invention are intended to provide a more complete and complete and complete disclosure of the scope of the present invention, and The scope of the patent application is defined.

Please refer to FIG. 1 to FIG. 3; FIG. 1 is a schematic structural view of a magnetic flux switching permanent magnet motor according to the present invention; FIG. 2 is a schematic diagram of a single module of a magnetic flux switching permanent magnet motor according to the present invention; The figure is a function of the relationship between the diameter of the rotor pole and the position of the magnetic flux switching permanent magnet motor of the present invention. As shown, the flux switching permanent magnet motor of the present invention includes a motor stator 110 and a motor rotor 120. Among them, the motor stator 110 surrounds the motor rotor 120.

In other words, the motor stator 110 has twelve stator teeth 111, and each of the stator teeth 111 has a permanent magnet 130 interposed therebetween, and one surface of each stator tooth 111 corresponds to one of the adjacent ones of the adjacent stator teeth 111. The magnets 130 have the same magnetic properties, and the adjacent two stator teeth 111 have a slot 112 at a pitch. Motor rotor 120 has a plurality of rotor poles 121. Wherein, the stator tooth 111 can be made of a silicon steel sheet.

Wherein, the motor stator 110 and the motor rotor 120 meet the following conditional formulas: (1) (2) (3) (4) (5) (6) (7) wherein b _m is the thickness of the permanent magnet, b _t is the 1/2 width of the stator tooth not including the permanent magnet, b _s is the width of the tooth groove, and b _i is the stator yoke of the stator tooth Thickness, b _p is the width of the rotor pole, b _h is the height of the rotor pole, R _si is the inner diameter of the motor stator, R _so is the outer diameter of the motor stator, S is the ratio of the inner and outer diameter of the motor stator, and T _s is the stator tooth The pole pitch of the pole, N _s is the number of slots, R _r is the diameter of the rotor of the motor, and R _ro is the outer diameter R _ri of the rotor of the motor is the inner diameter of the rotor of the motor.

As shown in FIG. 1 , the stator tooth 111 and the stator tooth 111 have a stator yoke 113 in addition to the tooth groove 112 , and each of the stator yokes 113 respectively corresponds to the tooth groove 112 and connects adjacent stator teeth. Extreme 111.

Further, as shown in Fig. 2, the portion 131 of the permanent magnet corresponding to the stator yoke may be replaced by a non-magnetic material, and the thickness of the portion 131 of the permanent magnet corresponding to the stator yoke may not be larger than the thickness of the stator yoke 113.

In addition, there may be an air gap between the motor stator 110 and the motor rotor 120; the width of the air gap may be the inner diameter of the motor stator 110 minus the outer diameter of the motor rotor 120.

Referring to FIG. 1 , each stator tooth 111 has a coil winding, and 12 stator teeth 111 are divided into three phases A, B, and C, each phase includes four stator teeth 111, and the coils also have three phases. Each phase coil is wound around four stator teeth 111 of the corresponding phase, and the coils of the phase stator tooth 111 can be connected in series or in parallel; preferably, the high voltage can be connected in series, the low voltage can be connected in parallel, and can be changed according to requirements. The number of turns in the coil.

In more detail, the flux-switching permanent magnet motor manufactured according to the design of the conditional formulas (1) to (5) has excellent efficiency and high electromagnetic torque, and the torque it exhibits and Torque chopping is still not negligible; further, in order to have the characteristics of low-torque torque and low-torque chopping equivalent to surface-type permanent magnet synchronous motors, the width and height of the rotor poles need to be redesigned.

Wherein, the area A _s surrounded by one stator slot can be derived from conditional expression (8): (8)

Phase resistance R _a can be deduced as the conditional expression (9): (9)

Where m represents the number of phases of the flux switching permanent magnet motor; Representing the number of turns of the coil of each phase of the flux switching permanent magnet motor; The resistivity of copper; For the slot packing factor; The axial length of the magnetic flux switching permanent magnet motor; It is the length of the flux-switching permanent magnet motor end-winding, as shown in condition (10): (10)

The torque of the flux-switched permanent magnet motor can be derived from the conditional expression (11): (11)

among them, Represents the number of poles of the rotor pole; The magnet flux connection size in the d-axis direction of the rotor is as shown in the conditional expression (12): (12)

among them, The maximum flux density of the stator steel material.

As shown in Fig. 2, based on the design of the width and height of the rotor poles shown in the conditional formulas (4) and (5), and then according to the rotor pole position angle, the conditional formula (6) is used to make the rotor pole diameter long. The arc-removing action is to change the air gap flux, thereby achieving the purpose of reducing the torque and torque ripple.

However, when the rotor pole position is changed from zero degrees to 360 degrees, as shown in Fig. 3, the rotor pole position is zero degrees, and the rotor diameter is long. For the outer diameter of the rotor Corresponding to the length in Figure 3 with a length of +1 unit; and the rotor pole position is 180 degrees. Inner diameter of the rotor Corresponding to the length in Figure 3, the length of the motor is -1 unit; and the average diameter of the motor rotor corresponds to the length of 0 in Figure 3.

According to the above description, the magnetic flux switching type permanent magnet motor of the present invention has a structure in which a stator magnet is inserted into a permanent magnet of the stator tooth and a design of an arc is applied to the rotor pole, so that the magnetic body of the present invention The switching permanent magnet motor can simplify the complicated design of the conventional motor and can effectively reduce the torque and torque ripple of the conventional motor.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

110‧‧‧Motor stator
111‧‧‧Standard teeth
112‧‧‧ cogging
113‧‧‧stator yoke
120‧‧‧Motor rotor
121‧‧‧Rotor pole
130‧‧‧ permanent magnet
131‧‧‧ permanent magnet corresponding to the part of the stator yoke

Fig. 1 is a schematic view showing the structure of a magnetic flux switching type permanent magnet motor of the present invention. 2 is a schematic diagram of a single module of the flux switching permanent magnet motor of the present invention. Figure 3 is a schematic diagram showing the relationship between the diameter of the rotor pole and the position of the magnetic flux switching permanent magnet motor of the present invention.

110‧‧‧Motor stator

111‧‧‧Standard teeth

112‧‧‧ cogging

113‧‧‧stator yoke

120‧‧‧Motor rotor

121‧‧‧Rotor pole

130‧‧‧ permanent magnet

Claims (5)

A flux-switching permanent magnet motor comprising: a motor stator having twelve stator teeth, each of which has a permanent magnet inserted therein, one of the stator teeth and the adjacent stator teeth One of the poles corresponds to the same magnet of the permanent magnet, the adjacent two of the stator teeth have a tooth slot; and a motor rotor has a plurality of rotor poles; wherein the motor stator and the motor rotor system meet the following Conditional formula: ; ; ; ; ; ;as well as Where b _m is the thickness of the permanent magnet, b _t is the 1/2 width of the stator tooth that does not include the permanent magnet, b _s is the width of the tooth groove, and b _i is the stator tooth The thickness of one of the pole stator yokes, b _p is the width of the rotor pole, b _h is the height of the rotor pole, R _si is the inner diameter of the motor stator, and R _so is the outer diameter of the motor stator. S is the ratio of the inner and outer diameters of the stator of the motor, T _s is the pitch of the slots of the stator teeth, N _s is the number of slots, and R _r is the length of the rotor of the motor, and R _ro is the The outer diameter R _ri of the motor rotor is the inner diameter of the motor rotor. The magnetic flux switching type permanent magnet motor according to claim 1, wherein each of the stator teeth is coupled by the stator yoke, and each of the stator yokes respectively corresponds to a tooth gap. The magnetic flux switching type permanent magnet motor of claim 2, wherein the portion of the permanent magnet corresponding to the stator yoke is replaced with a non-magnetic material. The flux switching permanent magnet motor of claim 1, wherein the motor stator and the motor rotor have an air gap. The flux switching permanent magnet motor of claim 4, wherein the air gap has a width that is an inner diameter of the motor stator minus an outer diameter of the motor rotor.