CN202565044U

CN202565044U - Stator permanent magnet bearingless motor

Info

Publication number: CN202565044U
Application number: CN2012202296800U
Authority: CN
Inventors: 贾红云; 程明; 花为
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2012-05-21
Filing date: 2012-05-21
Publication date: 2012-11-28
Anticipated expiration: 2022-05-21

Abstract

The utility model discloses a stator permanent magnet bearingless motor which is a bearingless motor has the advantages of simple structure, strong rotor, high efficiency and high reliability. The stator permanent magnet bearingless motor comprises a stator and a rotor. The rotor is located inside or outside the stator. The stator and the rotor are of doubly salient structure. An armature winding, a suspension winding and a permanent magnet are arranged on the stator. The armature winding and the suspension winding are concentrated windings and are wound on the tooth of a stator iron core. The stator permanent magnet bearingless motor provided by the utility model has the simple structure of a bearingless switch reluctance motor, has the high efficiency and the high power density of a bearingless rotor permanent magnet motor, and has high theoretical and practical values.

Description

A kind of stator permanent-magnet bearing-free motor

Technical field

The utility model be a kind of simple in structure, rotor is firm, has high reliability and high efficiency stator permanent-magnet bearing-free motor, belongs to the technical field that motor is made.

Background technology

There is active demand in fields such as high-speed driving, sealing transmission and Aero-Space to the no bearing running technology of motor.Because many limitations of mechanical bearing, common electric machine can't satisfy the requirement that runs up for a long time; The control appliance of air supporting and liquid bearing is huger, and cost is high; Advantages such as magnetic suspension bearing has does not has the machinery wearing and tearing, need not lubricated and sealing system, and adaptive capacity to environment is strong, but magnetic bearing electric system overall structure is complicated, power density is not high, critical whirling speed and power capacity are difficult to increase substantially.

Make a general survey of the document of delivering both at home and abroad, adopt the motor type of no bearing technology mainly to have or not bearing asynchronous machine, bearing-free switch reluctance motor and bearing-free permanent magnet synchronous motor (all referring to the rotor magneto, down together).No bearing asynchronous machine is simple in structure with it, reliability is high, be easy to characteristics such as weak magnetic becomes research bearing-free motor type the earliest, and still, its distinct issues is its suspending power control and torque control coupling, and rotating speed is easily by suspending power control interference; Bearing-free switch reluctance motor is simple in structure, manufacturing and easy to maintenance, and robustness is good, is applicable to adverse circumstances such as high temperature, and still, the power density of bearing-free switch reluctance motor and efficient are difficult to further raising; By contrast; Bearing-free permanent magnet synchronous motor is so that it is simple in structure, reliable, volume is little, in light weight, advantage such as efficient is high and power density is big; More possess the practicability advantage in fields such as flywheel energy storage, various high-speed machine tool spindle motor and canned pump class, centrifuge, compressor, high speed micro hard disk drive units, be considered to have most the bearing-free motor of application prospect.Yet the bearing-free permanent magnet synchronous motor of the employing conventional rotors magneto structure that has occurred has certain limitation: on the one hand, permanent magnet is mounted on rotor surface or is embedded in the globality structure that rotor has destroyed rotor; And as using motor at a high speed; Its rotor all is at a high speed even ultrahigh speed running status (tens thousand of rev/mins even hundreds thousand of rev/mins) usually, and the influence that magnet steel receives centrifugal force when preventing that motor from running up gets rid of, and the fixture that stainless steel or metallic fiber material are made all is housed on rotor; Cause its complex structure; Manufacturing cost improves, and effective air gap is long, and the permanent magnet utilance reduces; On the other hand, permanent magnet is positioned at rotor, and cooling condition is poor; The heat radiation difficulty; Along with the rising of temperature, causing with neodymium iron boron (NdFeB) is that master's permanent magnet performance descends, when serious even irreversible demagnetization takes place; Restricted the further raising of motor performance, and then limited of the application of no bearing rotor permanent-magnetic electric machine in some occasion.

To sum up, bearing-free switch reluctance motor and no bearing rotor permanent-magnetic electric machine have drawback separately: though the former is simple in structure, reliability is high, be not so good as magneto at aspects such as efficient, power factors; Though the latter has improved efficiency of motor and power factor, permanent magnet places rotor, and its heat radiation and mechanically stable property problem can not be ignored.Therefore; The simple structure of bearing-free switch reluctance motor and the high efficiency of no bearing rotor permanent-magnetic electric machine are combined; The advantage that collects the two; Research integrates the novel bearing-free motor structure and the relevant control theory thereof of high reliability and high efficiency, not only has important academic significance, and has extremely important practical applications value.

The utility model content

The purpose of the utility model is exactly the fundamental characteristics that combines bearing-free motor and stator permanent-magnet motor, has proposed the stator permanent-magnet bearing-free motor that a kind of permanent magnet places stator.

The utility model is realized through following technical scheme:

A kind of stator permanent-magnet bearing-free motor; Comprise stator and rotor; Stator and rotor all are the biconvex electrode structure, and rotor is positioned at the inside or the outside of stator, evenly are provided with threephase armature winding, suspending windings and permanent magnet on the stator; Threephase armature winding and suspending windings are concentrated winding, are around on the salient pole tooth of stator core.

Permanent magnet is positioned at stator yoke portion, and permanent magnet is ferrite or Nd-Fe-B permanent magnetic magnet steel.

Each coil of armature winding is all across on two stator tooths in the three-phase set; Wherein, Armature winding one has 12 concentrated armature coils in the three-phase set; Form A after four coils of A1～A4 are connected in proper order and concentrate armature winding mutually, B is identical with A phase winding structure with C phase armature winding structure mutually, just on the locus, has differed-30 ° and+30 ° respectively with A.

A phase suspending windings is to be connected by two relative suspended coils of X-direction, two suspended coils relative with Y direction to form, and B is identical with A phase suspending windings structure with the suspending windings structure of C phase mutually.

The beneficial effect of the utility model is:

Based on the stator permanent-magnet bearing-free motor have simple in structure, rotor is firm, power density is high, the efficient advantages of higher, can be used for fields such as flywheel energy storage, various high-speed machine tool spindle motor and canned pump class, centrifuge, compressor, high speed micro hard disk drive unit.

1. bearing-free switch reluctance motor compact conformation, simple, fault freedom and the good advantage of robust performance have structurally been kept;

2. on performance, kept the advantage that the bearing-free permanent magnet synchronous motor loss is little, power density is big, efficient is high;

3. a cover suspending windings that on the stator permanent-magnet motor, is increased is easy for installation, realizes easily;

4. the armature in the motor all adopts concentrated winding with the two cover windings that suspend, and the end is shorter, and loss is lower.

Description of drawings

Fig. 1 is the utility model stator permanent-magnet bearing-free motor structural representation.

Wherein: 1, stator; 2, permanent magnet; 3, the threephase armature winding; 4, X axle suspension is floated winding; 5, Y axle suspension is floated winding; 6, rotor.

Embodiment

The stator permanent-magnet bearing-free motor that the utility model proposed comprises: stator 1, rotor 6, permanent magnet 2, threephase armature winding 3, the floating winding 4 of X axle suspension and the floating winding 5 of Y axle suspension; X axle suspension is floated winding, the floating winding of Y axle suspension, threephase armature winding 3 and permanent magnet 2 and is all placed stator; There was not permanent magnet and both there has been winding on the rotor; Simple in structure, reliability is high.Magnetic field that the suspending windings of stack and permanent magnet produce and the magnetic field interaction that armature winding produced produce the radial suspension force that size and Orientation is controlled, thereby realize the stable suspersion of rotor.

With one 3 phase stator 12 utmost points/rotor 8 utmost point motors is example, and its sectional view is as shown in Figure 1, and 12 equally distributed utmost points are arranged on the stator, and 8 equally distributed utmost points are arranged on the rotor; Use thickness to be washed into stator punching and rotor punching as the silicon steel sheet of 0.5mm by shape shown in Figure 1, the punching with capacity laminates into stator core and rotor core again; In stator core, arrange 4 permanent magnets, permanent magnet is two stator poles (tooth) at interval; Each coil of armature winding is all across on two stator tooths in the three-phase set; Wherein, Armature winding one has 12 concentrated armature winding and forms in the three-phase set, and Fig. 1 has only illustrated the structure of A phase winding, four coils of the A1～A4 back of connecting in proper order to form A phase armature winding; B is identical with A phase winding structure with C phase armature winding structure mutually, and B has just differed-30 ° and+30 ° respectively with C mutually mutually with A on the locus; A phase suspending windings is to be connected respectively by the floating winding of two relative X axle suspension of the X-direction floating winding of two Y axle suspension relative with Y direction to form, and B is identical with A phase suspending windings structure with the suspending windings structure of C phase mutually.

Claims

1. a stator permanent-magnet bearing-free motor comprises stator and rotor, it is characterized in that: stator and rotor all are the biconvex electrode structure, and rotor is positioned at the inside or the outside of stator; Evenly be provided with threephase armature winding, suspending windings and permanent magnet on the stator, threephase armature winding and suspending windings are concentrated winding, are around on the salient pole tooth of stator core.

2. stator permanent-magnet bearing-free motor according to claim 1 is characterized in that: permanent magnet is positioned at stator yoke portion, and permanent magnet is ferrite or Nd-Fe-B permanent magnetic magnet steel.

3. stator permanent-magnet bearing-free motor according to claim 1 and 2 is characterized in that: stator contains 12 salient poles, and the series connection coiling forms A phase armature winding respectively on per 4 equally distributed salient poles, and B phase armature winding and C be armature winding mutually.