CN202424345U

CN202424345U - Permanent magnet motor with mixed magnetic poles

Info

Publication number: CN202424345U
Application number: CN201120573461XU
Authority: CN
Inventors: 张桂林
Original assignee: Beijing Mingcheng Technology Development Co Ltd
Current assignee: Beijing Mingcheng Technology Development Co Ltd
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2012-09-05
Anticipated expiration: 2021-12-31

Abstract

The utility model discloses a permanent magnet motor with mixed magnetic poles, which comprises a shell, a stator and a rotor. The stator is fixed into the shell along the axial direction of the shell, the rotor is disposed in the stator and comprises a rotating shaft, a rotor yoke and a plurality of groups of permanent magnets, the rotor yoke is disposed on the rotating shaft, the permanent magnets are arranged on the rotor yoke, and the groups of permanent magnets are disposed on the surface of the rotor yoke and are the mixed magnetic poles consisting of neodymium iron boron permanent magnets and ferrite magnets. By the aid of the permanent magnet motor with the mixed magnetic poles, harmonic waves in electric potential can be effectively reduced, harmonic loss and harmonic damage to electric equipment are greatly reduced, the efficiency of the motor is improved, and an energy-saving effect is achieved. In addition, the permanent magnet motor is simple in manufacturing process and low in production cost, and meets industrial production requirements.

Description

A kind of mixed magnetic pole permanent magnetic motor

Technical field

The utility model belongs to the magneto technical field, particularly relates to a kind of mixed magnetic pole permanent magnetic motor.

Background technology

Commercial production has strict requirement to the sine property of the electromotive force waveform of synchronous machine, and the extent of deviation between actual electrical kinetic potential (being often referred to non-loaded line voltage) waveform and the sinusoidal waveform is represented with the sinusoidal sex distortion rate of voltage waveform.China's national Specification, the sinusoidal sex distortion rate of voltage waveform is meant the square root of all each harmonic effective value quadratic sums that do not comprise first-harmonic in this voltage waveform and the percentage of this waveform first-harmonic effective value, uses k _U(%) expression, promptly

k_{U} = \frac{\sqrt{{U_{2}}^{2} + {U_{3}}^{2} + . . . + {U_{v}}^{2} + . . .}}{U_{1}} \times 100 = \frac{\sqrt{Σ_{v = 2}^{\infty} {U_{v}}^{2}}}{U_{1}} \times 100

In the formula-line voltage in the effective value (V) of v subharmonic;

The first-harmonic effective value (V) of-line voltage.

In order to reduce the sinusoidal sex distortion rate of voltage waveform, except that adopting measures such as distributed winding, short distance winding, positive chorded winding, skewed slot, also should improve the air-gap field waveform.Miniature and low power permagnetic synchronous motor is as adopt even air gap when less demanding usually to voltage waveform, unloaded air-gap field is similar to a square wave.When strict, adopting following method to improve the air-gap field distribution waveform usually, make it as far as possible near sinusoidal to voltage waveform:

1. adopt and do not wait air gap;

2. adopt the not magnet steel of equal thickness;

3. pole shoe shape is processed, like top rake etc.

But above method has the shortcoming of the inconvenience of making, and has improved the production cost of motor.

The utility model content

To the problems referred to above that prior art exists, the purpose of the utility model is to provide a kind of mixed magnetic pole permanent magnetic motor that improves the magnetic potential of air gap waveform.

To achieve these goals, a kind of mixed magnetic pole permanent magnetic motor that the utility model provides comprises casing, stator and rotor; Said stator is axially fixed in the said casing along said casing; Said rotor is arranged in the said stator, and said rotor comprises rotating shaft, rotor yoke and organize permanent magnet more that said rotor yoke is arranged in the said rotating shaft; Said permanent magnet is arranged at respectively on the said rotor yoke; It is characterized in that, organize the surface that said permanent magnet is arranged at said rotor yoke more, and every group of said permanent magnet all is the combined magnetic poles that are made up of Nd-Fe-B permanent magnet and ferrite permanent magnet.

As preferably, in every group of said permanent magnet, said ferrite permanent magnet is arranged at the both sides of said Nd-Fe-B permanent magnet.

As preferably, the said ferrite permanent magnet that is positioned at any side of said Nd-Fe-B permanent magnet accounts for 1/4th of the length of whole permanent magnet on said rotor yoke circumference in the length on the said rotor yoke circumference.

The beneficial effect of the utility model is: permanent magnet pole adopts the permanent magnetic material of two kinds of different magnetic properties; Changed the magnetic potential of air gap in the pole span τ scope the regularity of distribution, obtained the air-gap field that distributes near sinusoid; Thereby draw simple sinusoidal electromotive; Effectively cut down harmonic components in the electromotive force, reached industrial requirement.Because effectively cut down the harmonic wave in the electromotive force, greatly reduce harmonic loss and reach harmonic wave infringement power consumption equipment, improved efficiency of motor, reach energy-conservation effect.And manufacturing process is simple, and production cost is low, meets the commercial production requirement.

Description of drawings

Fig. 1 is the mixed magnetic pole permanent magnetic motor structural representation of the utility model.

Fig. 2 is the air gap flux density waveform of the mixed magnetic pole permanent magnetic motor of the utility model.

Fig. 3 is the harmonic analysis of waveform among Fig. 2.

Fig. 4 is the air gap flux density waveform that magnetic pole adopts the magneto of neodymium iron boron homogenous material in the prior art.

Fig. 5 is the harmonic analysis of waveform among Fig. 4.

Embodiment

Below in conjunction with accompanying drawing the structure of the utility model is done and to be further described:

A kind of mixed magnetic pole permanent magnetic motor as shown in Figure 1, that the utility model provides comprises columnar casing 1; Hollow cylinder stator 2; Said stator 2 inboards offer equally distributed groove 3 along circumference; Lay stator coil 4 in the said groove 3; Said stator coil 4 connects into the polyphase windings of symmetry according to rule; In the stator 2 of hollow cylinder rotor is installed; Rotor comprises rotating shaft 6, rotor yoke 7 and organizes permanent magnet 8 more; Wherein, every group of said permanent magnet 8 is arranged at the surface of said rotor yoke 7 with the tile type structure, and every group of said permanent magnet 8 all is the combined magnetic poles that are made up of Nd-Fe-B permanent magnet 10 and ferrite permanent magnet 9.

Fig. 2 to Fig. 5 shows the air gap flux density waveform and the Harmonic Waves analysis of the magneto of the single NdFeB material of mixed magnetic pole permanent magnetic motor and the existing employing of the utility model respectively.Can find out through contrast; Use the combined magnetic pole structure described in the utility model; The magnetic potential of air gap regularity of distribution in the pole span τ scope, the air-gap field that acquisition distributes near sinusoid have been changed; Thereby draw simple sinusoidal electromotive, effectively cut down the harmonic components in the electromotive force, reach industrial requirement.Because effectively cut down the harmonic wave in the electromotive force, greatly reduce harmonic loss and reach harmonic wave infringement power consumption equipment, improved efficiency of motor, reach energy-conservation effect.

In addition, as shown in Figure 1, in the utility model, as preferably, in every group of said permanent magnet 8, said ferrite permanent magnet 9 is arranged at the both sides of said Nd-Fe-B permanent magnet 10.And, further preferably, the length of said ferrite permanent magnet 9 on said rotor yoke 7 circumference that is positioned at said Nd-Fe-B permanent magnet 10 any sides account for whole permanent magnet 8 on the rotor yoke circumference length 1/4th.

Certainly; The above is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also are regarded as the protection range of the utility model.

Claims

1. mixed magnetic pole permanent magnetic motor; Comprise casing, stator and rotor, said stator is axially fixed in the said casing along said casing, and said rotor is arranged in the said stator; Said rotor comprises rotating shaft, rotor yoke and organizes permanent magnet more; Said rotor yoke is arranged in the said rotating shaft, and said permanent magnet is arranged on the said rotor yoke, it is characterized in that; The said permanent magnet of many groups is arranged at the surface of said rotor yoke respectively, and every group of said permanent magnet all is the combined magnetic poles that are made up of Nd-Fe-B permanent magnet and ferrite permanent magnet.

2. mixed magnetic pole permanent magnetic motor according to claim 1 is characterized in that, in every group of said permanent magnet, said ferrite permanent magnet is arranged at the both sides of said Nd-Fe-B permanent magnet.

3. mixed magnetic pole permanent magnetic motor according to claim 2; It is characterized in that the said ferrite permanent magnet that is positioned at any side of said Nd-Fe-B permanent magnet accounts for 1/4th of the length of whole permanent magnet on said rotor yoke circumference in the length on the said rotor yoke circumference.