CN2195822Y

CN2195822Y - Permanent-magnet DC brushless motor

Info

Publication number: CN2195822Y
Application number: CN 94236723
Authority: CN
Inventors: 陈吉琈; 吴家兴; 高云; 杨通荣; 龚自胜
Original assignee: SKILLED WORKER SCHOOL ZIYANG DIESEL LOCOMOTIVE FACTORY
Current assignee: SKILLED WORKER SCHOOL ZIYANG DIESEL LOCOMOTIVE FACTORY
Priority date: 1994-06-24
Filing date: 1994-06-24
Publication date: 1995-04-26
Anticipated expiration: 2004-06-24

Abstract

The utility model discloses a permanent magnet direct current brushless motor. The cylindrical side surface of the whole rotor of the brushless motor is covered by four rare earth permanent magnets 5 with the same size, and a rotor position sensor of the brushless motor is arranged at the position of a slot 6 of a stator core and consists of three magnetic sensitive switches uniformly distributed in a 120-degree (or 360-degree) central angle. Compared with the similar products, the utility model discloses the sensitivity can be high, does not have the start-up dead point, especially is fit for using in direct current brushless electric fan.

Description

Permanent-magnet direct current brushless electric machine

The utility model belongs to direct current machine and makes the field.

Present general non-brush permanent-magnet DC motor exists and starts the dead point, promptly exist the phenomenon that is in rotor motionless (or can not rotate immediately) when making electric motor starting on some special positions owing to rotor, because the existence of this phenomenon, motor can not normally be worked, also burn out electronic control circuit sometimes and cause damage.Trace it to its cause, mainly be the distribution of magnetic pole in the rotor and magneto sensor be provided with the position unreasonable due to.

In view of the above shortcoming of prior art, the purpose of this utility model is to design a kind of good startability that has, and do not have the dead point of startup, and working stability is reliable, the novel permanent magnetic dc brushless motor that failure rate is low.

The purpose of this utility model is to realize by following means.

On by stator, p-m rotor and the non-brush permanent-magnet DC motor formed with the electronics order gate of rotor-position sensor control etc., the cylindrical side unshakable in one's determination of whole rotor is covered the different tight arrangement of adjacent permanent magnet polarity with the rare-earth permanent magnet that four block size same radial magnetize; In addition, will be arranged on position between the groove of stator core by the rotor-position sensor that three magnetosensitive switches are formed, these three magnetosensitive switches are uniform in 120 degree or 360 degree central angles.

After having adopted design as above,, reduced the malfunction district of magneto sensor, made magneto sensor know rotor position information more exactly because permanent magnetism magnetic pole does not have the sort of in the prior art " clear area " with the cylindrical side covering of whole rotor between each magnetic pole; Simultaneously, unit interval flux change amount increases when making the rotor running, has reduced the startup and the operating current of motor; On the other hand, magneto sensor is arranged on part between the groove of stator core, its result is equivalent to the magneto sensor position of prior art has been moved forward the wire casing width half, makes that the winding that magneto sensor is controlled that will enter opening is open-minded in advance; The winding that magneto sensor is controlled that enters closed condition is closed in advance.Thereby obtain a leading angle of flow, avoided magneto sensor in the prior art with the winding of controlling overlapping and startup dead point of easily causing in wire casing.

Because the improvement of above two aspects of the utility model, make the dead point startup problem of non-brush permanent-magnet DC motor be resolved, the utility model is used on the passenger vehicle brush DC electric fan, through in Chengdu Railway Bureau Chengdu, many electric fan entruckings trial runs of three rolling stock sections in Kweiyang, Kowloon slope, the result shows, the utlity model has good startability and reliability.

Description of drawings is as follows:

Fig. 1, prior art rotor-position sensor position is provided with figure.

Fig. 2, p-m rotor of the present utility model.

Fig. 3, rotor-position sensor of the present utility model position is provided with figure.

Below in conjunction with accompanying drawing structure of the present utility model is described in further detail.

In Fig. 2 and Fig. 3,1 is stator, 2 is p-m rotor, 3 is electronics order gate, the cylindrical side of whole rotor core is covered by the rare earth permanent magnet magnetic pole 5 that four block size same radial magnetize, the different tight arrangement of adjacent permanent magnetism magnetic pole polarity does not have Fig. 1 " clear area " 7 of the prior art.

In Fig. 3, rotor-position sensor is arranged on 6 positions between the groove of stator core, rather than among Fig. 1 in the prior art like that with the winding of controlling is overlapping is arranged in the wire casing 8.Transducer is made up of three uniform Hall elements 4 in 120 degree (also can 360 degree) central angles.

Claims

1, a kind of non-brush permanent-magnet DC motor by stator 1, p-m rotor 2, form with the electronics order gate of rotor-position sensor control etc., is characterized in that:

A) rare-earth permanent magnet 5 that magnetizes by four block size same radial of the cylindrical side of whole rotor core cover the different tight arrangement of adjacent permanent magnet polarity;

B) described rotor-position sensor is arranged on 6 positions between stator coring groove, is made up of three uniform magnetosensitive switches 4 in 120 degree (or 360 degree) central angle.