CN2275296Y - Rare-earth permanent magnet starting motor with auxiliary electrode - Google Patents

Abstract

The utility model relates to a rare-earth permanent-magnet starting motor with auxiliary poles, which comprises a stator and a rotor. The stator comprises a circular-cylinder-shaped machine shell and four circular-arc-shaped magnetic poles of rare-earth permanent magnets, and the four circular-arc-shaped magnetic poles of rare-earth permanent magnets are fixed to the inner wall of the machine shell. One soft-magnetic auxiliary pole which has favorable magnetic conductivity is arranged on the inner wall of the machine shell on one side of each of the circular-arc-shaped magnetic poles of rare-earth permanent magnets opposite to the rotation direction of the rotor, and gaps whose widths are 0.5-2.0 mm are respectively formed between the auxiliary poles and the circular-arc-shaped magnetic poles of rare-earth permanent magnets. Because soft-magnetic auxiliary poles are arranged in the utility model, and magnetic field for armature reaction is fully utilized to generate obvious action of magnetic increase to make resultant magnetic field of airgaps of the motor change along with the variation of loads, so soft mechanical property is obtained, starting torque is enlarged, the rare-earth permanent-magnet starting motor with auxiliary poles is made to be more suitable for being applied to automobiles. The utility model has the advantages of small volume, light weight, high efficiency, energy saving and lower cost.

Description

Band interpole rare earth permanent magnet actuating motor

The utility model relates to a kind of permanent magnet direct current motor, particularly relate to a kind of be used for automobile start with the automobile starting motor of rare-earth permanent magnet as magnetic pole of the stator.

Direct current machine generally is made up of stator and rotor two large divisions, has empty vapour crack between stator and rotor.Be typically provided with field winding on the stator, when passing to direct current, just produce magnetic flux, form N, the S utmost point, this excitation mode is called electromagnetic type.In addition, magnetic pole of the stator also can be made with permanent-magnet steel, is called magneto.In recent years, replace permanent-magnet steel to have advantages such as energy-efficient, motor performance is obviously improved with rare-earth permanent magnet.Permanent magnet dc motor because simple in structure, volume is little, in light weight, making and easy to maintenance, be used widely.But the air-gap magnetic flux of such motor does not change with the variation of load substantially, has hard mechanical property, can not satisfy the requirement of automobile starting motor fully.The rare earth permanent-magnetic material price is more expensive in addition.

The purpose of this utility model is to overcome the weak point of existing actuating motor, a kind of advantage that had both kept rare-earth permanent-magnet electric machine is provided, have soft mechanical property again, increase starting torque, be more suitable for automobile starting motor requirement and lower-cost band interpole rare earth permanent magnet actuating motor.

The technical solution of the utility model is: band interpole rare earth permanent magnet actuating motor comprises stator and rotor two large divisions, contains cylindric casing and 4 rare-earth permanent magnet magnetic poles that are circular arc that are fixed on the casing inner wall in the stator.On casing inner wall, be positioned at a rare-earth permanent magnet magnetic pole side opposite and be provided with the good soft magnetism interpole of magnetic conduction, the gap of 0.5～2mm is arranged between this interpole and the permanent magnet pole with the rotor direction of rotation.

Be provided with insulation board in the gap of above-mentioned interpole and permanent magnet pole, can adopt the epocel plate as insulation board.Described interpole inside and outside circle cambered surface curvature equates with the curvature of outside in the permanent magnet pole respectively, the interpole arc section to central angle alpha=10 °～35 °.The material of interpole is No. 10 steel.

In the above technical scheme, be provided with the good soft magnetism interpole of magnetic conduction, make full use of armature reacting field and in interpole, produce and significantly increase magnetic action.Because armature reacting field is with load variations, the air-gap resultant magnetic field of motor also changes with load current, thereby obtains soft mechanical property and increase starting torque.When zero load simultaneously or underloading, armature reaction extremely a little less than, but because the existence of rare earth magnetic pole can not cause too high no-load speed, this is better than general series-wound motor performance.Band interpole rare-earth permanent magnet motor has not only kept the advantage that general rare-earth permanent magnet motor volume is little, in light weight, performance is good, energy-efficient, and adopts the soft magnetic material of common, inexpensive partly to replace more expensive rare earth permanent-magnetic material, has reduced cost.Simultaneously soft mechanical property, big starting torque, lower no-load speed is more suitable for the application of automobile starting motor.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

Accompanying drawing is a cross sectional representation of the present utility model.

As figure, rotor 1 is provided with armature coil 2, rotation in the direction of the clock after the energising.Contain cylindric casing 3 and 4 rare-earth permanent magnet magnetic poles 4 that are circular arc that are fixed on the casing inner wall in the stator.The inner arc surface of magnetic pole 4 becomes the extremely alternate setting of N, S.On casing inner wall, be positioned at every magnetic pole 4 side bonds opposite and soft magnetism interpole 5, the gap of 1mm is arranged between this interpole and the magnetic pole 4, separate with epocel plate 6 with the rotor direction of rotation.Interpole 5 inside and outside circle cambered surface curvature equate with the curvature of magnetic pole 4 inside and outside circle cambered surfaces respectively, and interpole institute is to central angle alpha=22.5 °, and the material of interpole is No. 10 steel.

Claims (4)

1, a kind of band interpole rare earth permanent magnet actuating motor, comprise stator and rotor two large divisions, contain cylindric casing and 4 rare-earth permanent magnet magnetic poles that are circular arc that are fixed on casing inner wall in the stator, it is characterized in that on casing inner wall, being positioned at a rare-earth permanent magnet magnetic pole side opposite and be provided with the good soft magnetism interpole of magnetic conduction, the gap of 0.5～2mm is arranged between this interpole and the permanent magnet pole with the rotor direction of rotation.

2,, it is characterized in that being provided with insulation board in the gap of interpole and permanent magnet pole by the described actuating motor of claim 1.

3, by the described actuating motor of claim 1, it is characterized in that interpole inside and outside circle cambered surface curvature equates with the curvature of face inside and outside the permanent magnet pole respectively, the interpole arc section to central angle alpha=10 °～35 °.

4, by the described actuating motor of claim 1, the material that it is characterized in that interpole is No. 10 steel.

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