Novel bearingless switched reluctance high-speed motor

Abstract

The utility model relates to a novel bearingless switched reluctance high-speed motor. Comprising a rotor, a stator and a motor shell, the rotor is arranged on the inner side of the stator, the distance from an inner ring of the rotor to the circle center is the inner diameter of the rotor, the distance from an outer ring of the rotor to the circle center is the outer diameter of the rotor, and left stator tooth poles and right stator tooth poles are arranged on the upper left portion, the upper right portion, the lower left portion and the lower right portion of the stator respectively. A suspension winding and a torque winding are arranged between the current i and the current i +, a torque winding magnetic flux is arranged on the outer side of the stator, and a motor shell is arranged on the outer side of the torque winding magnetic flux. The stator and the rotor are of a double-salient-pole structure, the centralized winding is wound on the stator iron core, and no winding is arranged on the rotor, so that the stator and the rotor are very convenient to manufacture and maintain. A magnetic suspension bearing is adopted to overcome the defects of complex structure, large volume, high energy consumption, low efficiency and the like of air-floating and liquid-floating bearing motors, and a suspension winding is wound on a stator tooth pole, so that the occupied axial space is relatively reduced, and the axial length of the motor is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of drive equipment, and specifically relates to a novel bearingless switched reluctance high-speed motor. Background Art

[0002] The switched reluctance motor is a brushless, single-excited, double-salient motor with neither windings nor permanent magnets on the rotor. There are concentrated windings on the stator poles, and the two windings on the radially opposite stator teeth in space form two magnetic poles of one phase through series or parallel connection. It rotates by attracting the rotor by exciting the stator poles. The switched reluctance motor is a bit rough mechanically, but it can achieve high-speed, trouble-free operation and is easy to mass-produce.

[0003] The high-speed rotation of the rotor of a high-speed motor with a traditional mechanical bearing supporting the rotating shaft leads to increased friction resistance, significant bearing wear and motor heating, which will lead to low motor efficiency and shorten the service life of the motor and mechanical bearings. The magnetic bearing motor itself occupies a certain axial space and has problems such as low rotor stiffness and low critical speed, which not only limits high-speed operation and output power, but also affects the miniaturization of high-speed motors; in addition, because each degree of freedom of the magnetic axis requires a set of power amplifiers, the system cost increases.

[0004] In summary, the existing technology has the problems of large friction resistance, complex structure, large size, high energy consumption, low efficiency, inconvenient maintenance, high cost and short life. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] Therefore, the purpose of the utility model is to provide a new type of bearingless switched reluctance high-speed motor, which can solve the problems of the prior art, such as large friction resistance, complex structure, large size, high energy consumption, low efficiency, inconvenient maintenance, high cost and short life. In order to solve the above technical problems, the utility model provides a new type of bearingless switched reluctance high-speed motor, which includes a rotor, a stator and a motor housing. The rotor is on the inner side of the stator, the distance from the inner ring of the rotor to the center of the circle is the inner diameter of the rotor, and the distance from the outer ring of the rotor to the center of the circle is the outer diameter of the rotor. The upper left, upper right, lower left and lower right of the stator have left stator tooth poles and right stator tooth poles respectively. The left stator tooth pole and the right stator tooth pole have current i on the right and current i on the left. + , the current i and the current i+ There are suspension windings and torque windings in between, there is torque winding magnetic flux on the outside of the stator, and the motor housing is outside the torque winding magnetic flux.

[0007] Optionally, there are rotor tooth poles on the outside of the rotor, there is an optimized pole arc radius between the rotor tooth poles, and there are rotor arc poles outside the rotor tooth poles and the optimized pole arc radius.

[0008] Optionally, the suspension winding is located at the upper left, upper right, lower left, and lower right of the stator, and the torque winding is located at the upper, lower, left, and right positions of the stator.

[0009] Optionally, there are rectangular grooves between the left stator tooth poles and the right stator tooth poles on the upper left, upper right, lower left and lower right of the stator.

[0010] By adopting the above technical solution, this case integrates the function of magnetic bearing into the motor by winding the suspension winding that generates suspension force and the magnetic winding of the motor together on the stator of the motor, giving the motor rotor the function of simultaneous rotation and suspension, and winding the suspension winding on the stator tooth pole, so that the occupied axial space is relatively small, shortening the axial length of the motor, and the critical speed of the rotor is relatively high, which has its application advantages in the fields of high-speed and ultra-high-speed, small volume and long life transmission. The rotation of the switched reluctance motor is based on the principle that the trend of the magnetic field in electromagnetic theory is always closed in the direction of the minimum magnetic resistance. Since the motor adopts the structure of salient pole stator and salient pole rotor, the magnetic resistance of the rotor changes during the rotation process. The stator magnetic field will pull the rotor from the place with large magnetic resistance to move it to the place with small magnetic resistance, thereby generating tangential magnetic pulling force. According to the principle of electromagnetic theory that the magnetic field is always closed in the direction of minimum magnetic resistance, the rotor will rotate clockwise under the action of the stator magnetic field. When the rotor rotates to a position that coincides with the stator magnetic pole, the magnetic pulling force in the tangential direction is equal to zero. At this time, only the axial magnetic pull is left and cannot generate the torque required for the rotor to rotate, so phase switching must be performed at this time. The three-phase rotation power is used to allow the motor to rotate continuously.

[0011] In summary, the present invention has at least one of the following beneficial effects:

[0012] The utility model adopts a double salient pole structure of the stator and the rotor, a concentrated winding is wound on the stator iron core, and there is no winding on the rotor, so the manufacturing and maintenance are very convenient.

[0013] The utility model adopts a magnetic bearing, which is a new type of bearing that uses magnetic field force to eliminate any mechanical contact between the rotor and the stator. Compared with air-floating and liquid-floating bearings, magnetic bearings do not need to be equipped with special air pressure and hydraulic systems, which improves the shortcomings of air-floating and liquid-floating bearing motors, such as complex structure, large size, high energy consumption, and low efficiency, and also improves the reliability of the motor and the system.

[0014] The utility model winds the suspension winding on the stator tooth pole, so that the occupied axial space becomes relatively small, the axial length of the motor is shortened, and the critical speed of the rotor is relatively high, which has its application advantages in the transmission field of high speed and ultra-high speed, small size and long life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a structural schematic diagram of a novel bearingless switched reluctance high-speed motor of the utility model;

[0017] List of figures: 1. rotor outer diameter; 2. rotor inner diameter; 3. rotor pole arc; 4. optimized pole arc radius; 5. suspension winding; 6. current i; 7. current i + ; 8. Torque winding; 9. Torque winding flux; 10. Left stator tooth pole; 11. Stator; 12. Rotor; 13. Motor housing; 14. Right stator tooth pole; 15. Rotor tooth pole. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1 The utility model is further described in detail.

[0019] Embodiment 1, refer to Figure 1 In order to solve the problems of large friction resistance, complex structure, large size, high energy consumption, low efficiency, inconvenient maintenance, high cost and short life in the prior art, the present utility model discloses a novel bearingless switched reluctance high-speed motor, including a rotor 12, a stator 11 and a motor housing 13. The rotor 12 is inside the stator 11. The distance from the inner ring of the rotor 12 to the center of the circle is the rotor inner diameter 2, and the distance from the outer ring of the rotor 12 to the center of the circle is the rotor outer diameter 1. The stator 11 has a left stator tooth pole 10 and a right stator tooth pole 14 on the upper left, upper right, lower left and lower right respectively. The left stator tooth pole 10 and the right stator tooth pole 14 have a current i6 on the right and a current i + 7. Current i6 and current i +7, there are suspension windings 5 ​​and torque windings 8, there are torque winding fluxes 9 on the outside of the stator 11, and the motor housing 13 is outside the torque winding flux 9. There are rotor tooth poles 15 on the outside of the rotor 12, there are optimized pole arc radius 4 between the rotor tooth poles 15, and there are rotor arc poles 3 outside the rotor tooth poles 15 and the optimized pole arc radius 4. The suspension winding 5 is located at the upper left, upper right, lower left, and lower right positions of the stator 11, and the torque winding 8 is located at the upper, lower, left, and right positions of the stator 11. There is a rectangular groove between the left stator tooth pole 10 and the right stator tooth pole 14 on the upper left, upper right, lower left, and lower right of the stator 11.

[0020] Specific implementation principle: When the motor is running at no load, the current of the torque winding 8 and the current of the suspension winding 5 are equal to zero, which meets the requirement of zero average torque. When the current is zero, no suspension force can be generated to maintain the stable suspension of the rotor 12. The lead angle is reduced, and the torque winding 8 and the suspension winding 5 generate some negative torque. When the lead angle is reduced to zero, even if the current is large, the positive and negative torques generated offset each other, and the average torque is zero. Since the current is zero, the suspension force of the rotor 12 can be maintained. By adjusting the size of the lead angle, the motor can be stably suspended from no load to full load. The accuracy of the finite element simulation result of the motor depends on the number of mesh divisions. If the number of meshes is too low, the calculated value is not accurate enough; if the number of meshes is too high, it will cause the problem of accumulated calculation errors, thereby reducing the calculation accuracy. In order to reduce the simulation calculation time and improve the simulation efficiency, the utility model selects to appropriately reduce the number of mesh divisions of the stator and rotor core parts.

[0021] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of bearingless switched reluctance high-speed motor, characterized in that: include, A rotor (12), a stator (11), and a motor housing (13), wherein the rotor (12) is inside the stator (11), the distance from the inner ring of the rotor (12) to the center of the circle is the rotor inner diameter (2), and the distance from the outer ring of the rotor (12) to the center of the circle is the rotor outer diameter (1). The stator (11) has a left stator tooth pole (10) and a right stator tooth pole (14) at the upper left, upper right, lower left, and lower right, respectively. The left stator tooth pole (10) and the right stator tooth pole (14) have a current i (6) on the right, and a current i + (7), the current i (6) and the current i + (7) is provided with a suspension winding (5) and a torque winding (8), the outer side of the stator (11) is provided with a torque winding magnetic flux (9), and the outer side of the torque winding magnetic flux (9) is provided with the motor housing (13).

2. A novel bearingless switched reluctance high-speed motor according to claim 1, characterized in that: The rotor (12) has rotor tooth poles (15) on the outside, an optimized pole arc radius (4) is provided between the rotor tooth poles (15), and a rotor arc pole (3) is provided outside the rotor tooth poles (15) and the optimized pole arc radius (4).

3. A novel bearingless switched reluctance high-speed motor according to claim 1, characterized in that: The suspension winding (5) is located at the upper left, upper right, lower left, and lower right positions of the stator (11), and the torque winding (8) is located at the upper, lower, left, and right positions of the stator (11).

4. A novel bearingless switched reluctance high-speed motor according to claim 1, characterized in that: Rectangular grooves are provided between the left stator tooth pole (10) and the right stator tooth pole (14) at the upper left, upper right, lower left and lower right of the stator (11).

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