CN206195572U - Two stators do not have bearing magnetic flow reverse motor - Google Patents

Abstract

The utility model discloses a double-stator bearingless magnetic flux reversal motor, which comprises an outer stator, a rotor, an inner stator, a permanent magnet, an armature winding and a suspension winding; the outer stator has six stator slots for specially placing the armature winding, The windings on the two stator teeth opposite in space are connected in series to form a phase; each stator slot is provided with an armature winding, and the armature windings in the radially opposite stator slots are connected in series to form a phase. A pair of permanent magnets for generating an excitation magnetic field is pasted on the bottom, and the polarity of the pair of permanent magnets at the bottom of the same stator slot is opposite; the rotor contains 8 rotor teeth equally spaced, and the inner stator is equidistantly arranged with 2 There are two levitation poles in the X-axis direction and two levitation poles in the Y-axis direction. The levitation poles are provided with levitation windings to realize the levitation of the rotor. This type of motor combines the advantages of high precision and fast response of the double-stator motor, high power density of the flux reversal motor, and the advantages of bipolar flux change, making the motor compact in structure.

Description

A Double-Stator Bearingless Flux Reversing Motor

technical field

The utility model belongs to the field of motor control, in particular to a double-stator bearingless flux reversal motor.

Background technique

The flux reversal motor has the advantages of simple rotor structure, high power density, small inductance, low inertia, and is suitable for high-speed rotation. However, when the rotor runs at high speed, it will cause mechanical bearing wear, shorten the service life of the motor, and affect the further development of the motor.

Bearingless motor is a new type of motor that integrates the functions of rotary drive and magnetic bearing. It not only overcomes many limitations of magnetic bearing motors, but also has high axial utilization, compact structure, can greatly increase critical speed, and has the same shaft length. Can greatly improve the output power and other advantages.

Throughout the literature published at home and abroad, the types of motors using bearingless technology mainly include asynchronous motors, reluctance motors and permanent magnet synchronous motors (both refer to rotor permanent magnet type, the same below). Bearingless asynchronous motor has become the earliest researched type of bearingless motor because of its simple structure, high reliability, and easy field weakening. However, its outstanding problem is that its suspension force control and torque control are coupled, and the speed is easily disturbed by the suspension force control. The bearingless switched reluctance motor has a simple structure, is convenient to manufacture and maintain, has good robustness, and is suitable for harsh environments such as high temperature. However, it is difficult to further improve the power density and efficiency of bearingless switched reluctance motors. In contrast, the bearingless permanent magnet synchronous motor has the advantages of simple structure, reliable operation, small size, light weight, high efficiency and high power density, and is widely used in flywheel energy storage, various high-speed machine tool spindle motors and sealed pumps, Centrifuges, compressors, high-speed micro-hard disk drives and other fields have more practical advantages, and are considered to be the most promising bearingless motors. However, the existing bearingless permanent magnet synchronous motors with traditional rotor permanent magnet structure have certain limitations: on the one hand, the permanent magnets mounted on the rotor surface or embedded in the rotor destroy the overall structure of the rotor, while as For high-speed motors, the rotors are usually in a high-speed or even ultra-high-speed operating state (tens of thousands of revolutions per minute or even hundreds of thousands of revolutions per minute). Fixing devices made of stainless steel or metal fiber materials lead to complex structures, increased manufacturing costs, long equivalent air gaps, and reduced utilization of permanent magnets; As the temperature rises, the performance of the permanent magnet mainly composed of NdFeB will decline, and even irreversible demagnetization will occur in severe cases, which restricts the further improvement of the motor performance, and then limits the application of the bearingless rotor permanent magnet motor in some occasions.

Utility model content

The technical problem to be solved by the utility model is to solve some deficiencies in the existing motors. The utility model aims to provide a double-stator bearingless flux reversal motor in which the armature winding and the suspension winding are decoupled and the two windings work together. , The utility model aims to simplify the structure space of the motor, improve the wear problem of the mechanical bearing of the motor, overcome the coupling between the electromagnetic torque of the motor and the suspension force, and increase the flexibility of the control of the armature winding and the suspension winding.

The utility model adopts the following technical solutions for solving the above-mentioned technical problems

A double-stator bearingless flux reversal motor, the motor includes an outer stator, a rotor and an inner stator, and the outer stator, the rotor and the inner stator are concentrically nested in sequence; the outer stator contains 6 stator slots, each of which The stator slots are equipped with armature windings, and the armature windings in the radially opposite stator slots are connected in series to form a phase. A pair of permanent magnets for generating an exciting magnetic field are attached to the bottom of each stator slot, and the same stator slot The polarity of a pair of permanent magnets at the bottom is opposite; the rotor contains 8 equally spaced rotor teeth, and the inner stator is equally spaced with 2 suspension poles in the X-axis direction and 2 suspension poles in the Y-axis direction. The poles are provided with levitation windings to realize the levitation of the rotor.

As a further preferred solution of the double-stator bearingless flux reversal motor of the present invention, the outer stator, the rotor and the inner stator are all salient pole structures.

As a further preferred solution of the double-stator bearingless flux reversal motor of the present invention, the pole pitch of the rotor is 45°.

As a further preferred solution of the double-stator bearingless flux reversal motor of the present invention, the rotor is made of magnetically permeable material.

As a further preferred solution of the double-stator bearingless flux reversal motor of the present invention, the permanent magnet is made of NdFeB permanent magnet material.

Compared with the prior art by adopting the above technical scheme, the utility model has the following technical effects:

1. Clear structure and clear function: the armature winding on the outer stator realizes the rotation of the motor, the permanent magnet on the stator teeth provides the excitation magnetic field, and the suspension winding on the inner stator realizes the suspension function of the rotor, which is convenient for maintenance and control;

2. The magnetic circuits of the armature winding and the suspension winding are independent of each other, and the suspension force is borne by the suspension winding alone, which avoids the coupling of the two magnetic circuits, and there is no mutual restriction between the two;

3. Both the armature and suspension windings in the motor adopt concentrated windings with short ends and low loss; 4. The suspension windings, armature windings and permanent magnets are all placed in the stator core. The rotor structure is simple and easy to dissipate heat. Reliable operation;

4. The utility model applies the bearingless technology to the magnetic flux reversing motor. On the basis of retaining the excellent performance of the magnetic flux reversing motor, it further eliminates the problems caused by the mechanical bearing, and at the same time solves the problem of the bearingless motor armature. The problem of electromagnetic coupling between the winding magnetic circuit and the levitation winding magnetic circuit.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-stator bearingless flux reversal motor proposed by the utility model.

The specific numbers in the figure are as follows: 1-outer stator, 2-rotor, 3-inner stator, 4-permanent magnet, 5-armature winding, 6-suspension winding.

detailed description

Below in conjunction with accompanying drawing, the technical scheme of the utility model is described in further detail:

As shown in Figure 1, a double-stator bearingless flux reversal motor includes an outer stator 1, a rotor 2 and an inner stator 3 to form a three-salient pole structure, and the rotor 2 and the inner and outer stators are concentrically nested.

The outer stator 1 includes 6 stator slots, each of which is provided with an armature winding 5, and a pair of permanent magnets 4 for generating an exciting magnetic field are attached to the bottom of each stator slot, and the same stator slot The polarity of a pair of permanent magnets at the bottom is opposite; the rotor contains 8 equally spaced rotor teeth, the rotor pole pitch is 45°, there is neither winding nor permanent magnet on the rotor, and the inner stator is made of magnetically conductive material. There are 4 suspension poles on the ground, which are divided into X-axis and Y-axis directions, that is, 2 suspension poles in the X-axis direction and 2 suspension poles in the Y-axis direction are arranged at equal intervals on the inner stator. Levitation winding for rotor suspension. The magnetic flux paths of the armature winding on the outer stator and the suspension winding on the inner stator do not interfere with each other, which overcomes the coupling problem between the torque and the suspension part. The armature winding 5 is located on the outer stator, and the suspension winding 6 is located on the inner stator. Through the interaction between the two sets of windings, the armature winding 5 and the suspension winding 6, and the magnetic field of the permanent magnet, the motor has the ability to rotate and levitate at the same time. The magnetic flux path of the armature winding It is independent of the magnetic flux path of the levitation winding. The number of phases of the armature winding is 3, and the number of poles of the stator is 6, so the armature windings on the radially opposite stator teeth are connected in series to form one phase. When the number of levitation poles is 4, the levitation windings are independent of each other, and the required radial levitation force can be obtained by individually controlling the current of each levitation winding.

Among them, there are 6 teeth on the outer stator 1 wound around the armature winding 5, the first armature winding 51 and the fourth armature winding 54 are connected in series to form phase A, and the second armature winding 52 and the fifth armature winding 55 are connected in series to form phase A In phase B, the third armature winding 53 and the sixth armature winding 56 are connected in series to form phase C. The permanent magnet 4 used to generate the excitation magnetic field is mounted on the surface of the outer stator tooth. The permanent magnet is made of ferrite or NdFeB permanent magnet material, and the polarity of the permanent magnet under the same stator tooth is opposite. The rotor 2 has a salient pole structure, and there is neither winding nor permanent magnet on it, so the structure is simple. The inner stator 3 is provided with 4 suspension teeth at equal intervals, on which suspension windings 6 are wound, and the suspension windings are not connected in series. Passing current to the first levitation winding 61 and the third levitation winding 63 can control the levitation force in the X-axis direction, and passing current to the second levitation winding 62 and the fourth levitation winding 64 turns can control the levitation force in the Y-axis direction.

In summary, the utility model has a clear structure and clear functions: the armature winding on the outer stator realizes the rotation of the motor, the permanent magnets on the stator teeth provide the excitation magnetic field, and the suspension winding on the inner stator realizes the suspension function of the rotor, which is convenient for maintenance and Control; the magnetic circuits of the armature winding and the suspension winding are independent of each other, and the suspension force is borne by the suspension winding alone, which avoids the coupling of the two magnetic circuits, and there is no mutual restriction between the two; both the armature and the suspension winding in the motor use concentrated windings, The end part is short and the loss is low; 4. The suspension winding, armature winding and permanent magnet are all placed in the stator core, and the rotor structure is simple, easy to dissipate heat, and reliable in operation; In the reversing motor, on the basis of retaining the excellent performance of the flux reversing motor, the problems caused by the mechanical bearing are further eliminated, and at the same time, the problem of electromagnetic coupling between the armature winding magnetic circuit and the suspension winding magnetic circuit of the bearingless motor is solved.

The above are only preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, but any equivalent modification or change made by those of ordinary skill in the art according to the content disclosed in the present utility model, All should be included in the scope of protection described in the claims.

Claims (5)

1. a kind of bimorph transducer bearing-free magnetic flux reverse motor, it is characterised in that：The motor includes external stator, rotor and inner stator, The external stator, rotor and inner stator are concentrically nested successively；The external stator includes 6 stator slots, wherein in each stator slot It is equipped with armature winding, and armature winding series connection in stator slot diametrically is a phase, the bottom of each stator slot is posted It is used for producing the permanent magnet of excitation field for a pair, and a pair of permanent magnet polarities of the bottom of same stator slot are opposite；The rotor Comprising 8 equidistantly distributed rotor tooths, be equally spaced on inner stator 2 X-directions suspension pole and 2 Y directions Suspension pole, suspension is extremely provided with the suspending windings of realizing rotor suspension.

2. a kind of bimorph transducer bearing-free magnetic flux reverse motor according to claim 1, it is characterised in that：The external stator, Rotor and inner stator are salient-pole structure.

3. a kind of bimorph transducer bearing-free magnetic flux reverse motor according to claim 1, it is characterised in that：The pole of the rotor Away from being 45 °.

4. a kind of bimorph transducer bearing-free magnetic flux reverse motor according to claim 1, it is characterised in that：The rotor is by leading Magnetic material is constituted.

5. a kind of bimorph transducer bearing-free magnetic flux reverse motor according to claim 1, it is characterised in that：The permanent magnet is adopted It is made of Nd-Fe-B permanent magnet material.