CN106549547A - A kind of mixing magnet steel magnetic flux switching memory electrical machine - Google Patents

Abstract

The invention discloses a mixed magnetic steel magnetic flux switching memory motor, the stator of which comprises n iron core units, n/2 high-coercivity permanent magnets and n/2 low-coercivity permanent magnets, wherein n /2 high-coercivity permanent magnets are magnetized tangentially, grooves are formed between two adjacent core units, n/2 high-coercivity permanent magnets and n/2 low-coercivity permanent magnets They are respectively embedded in n grooves, and the types of permanent magnets embedded in adjacent grooves are different, and the magnetization directions of adjacent high-coercivity permanent magnets are the same; each low-coercivity permanent magnet is equipped with a magnetic adjustment pulse coils, and the current direction of the adjacent magnetic modulation pulse coils is the same, and all the magnetic modulation pulse coils are connected in series to form a magnetic modulation pulse winding. The invention overcomes the defects of the traditional mixed excitation magnetic flux switching motor, reduces the excitation loss and improves the efficiency of the motor.

Description

A Hybrid Magnet Flux Switching Memory Motor

technical field

The invention belongs to the technical field of motors, and in particular relates to a hybrid magnetic steel magnetic flux switching memory motor, which is suitable for wide speed regulation operation occasions.

Background technique

The permanent magnet steel and armature winding of the flux switching permanent magnet motor are located on the stator, and there is neither winding nor permanent magnet on the rotor. It has simple structure, reliable operation, easy heat dissipation, and has high power density, high efficiency, and load It has the characteristics of strong ability and high sinusoidal back EMF, so it is considered to be a structure most likely to replace the rotor type permanent magnet motor.

However, because only the permanent magnets are excited, its ability to adjust the magnetic field is limited. Therefore, some experts and scholars have studied the electric excitation flux switching motor; although the magnetic field adjustment ability has been improved, its efficiency and power density are low.

French scholar E. Hoang took the lead in proposing a hybrid excitation flux switching motor with two magnetic potential sources (permanent magnet and field winding) in the document "A new structure of a switching flux synchronous polyphased machine with hybrid excitation". However, there is coupling between the two magnetic fluxes generated by the two magnetic potential sources of the hybrid excitation flux switching motor, which are easy to influence each other, increase the excitation loss, and reduce the efficiency of the motor.

Contents of the invention

In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a hybrid magnet steel flux switching memory motor, which overcomes the defects of the traditional hybrid excitation flux switching motor, reduces excitation loss, and improves motor efficiency.

In order to realize above-mentioned technical purpose, technical scheme of the present invention is:

A hybrid magnetic steel flux switching memory motor, the motor's stator includes n iron core units, n/2 high coercive force permanent magnets and n/2 low coercive force permanent magnets, of which n/2 high coercive force permanent magnets The coercivity permanent magnets are magnetized in a tangential direction, and grooves are formed between two adjacent iron core units, and n/2 high-coercivity permanent magnets and n/2 low-coercivity permanent magnets are respectively embedded in n In two grooves, the types of permanent magnets inlaid in adjacent grooves are different, and the magnetization directions of adjacent high-coercivity permanent magnets are the same; each low-coercivity permanent magnet is provided with a magnetic modulation pulse coil, and Adjacent magnetic modulation pulse coils are supplied with the same current direction, and all magnetic modulation pulse coils are connected in series to form a magnetic modulation pulse winding.

Based on the preferred solution of the above technical solution, the high coercivity permanent magnet adopts NdFeB permanent magnet.

Based on the preferred solution of the above technical solution, the low-coercivity permanent magnet is an AlNiCo permanent magnet.

Based on the preferred solution of the above technical solution, the magnetic modulation pulse winding adopts a centralized winding.

Based on the preferred solution of the above technical solution, an armature winding is also provided on the stator of the motor, and the armature winding adopts a symmetrical concentrated winding, and each armature coil straddles the gap between two adjacent iron core units and the middle. Embedded in the grooves on both sides of the stator pole composed of permanent magnets with high coercive force, and two radially symmetrical armature coils are connected in series or in parallel to form a phase armature winding.

Based on the preferred solution of the above technical solution, several salient poles are evenly distributed on the surface of the rotor of the motor, and there are no windings and permanent magnets on the rotor.

Based on the preferred solution of the above technical solution, the salient poles on the rotor are straight poles or oblique poles.

Based on the preferred solution of the above technical solution, the iron cores of the stator and the rotor of the motor are made of magnetically permeable materials.

The beneficial effect brought by adopting the above-mentioned technical scheme:

The present invention adopts mixed magnetic steel (high coercive force permanent magnet and low coercive force permanent magnet), high coercive force permanent magnet to provide the main magnetic field for the motor; further by changing the instantaneous pulse current in the magnetic modulation pulse winding To adjust the magnetism of the permanent magnet with low coercive force, so as to achieve the purpose of adjusting the main magnetic field, and there is almost no excitation loss, increasing the efficiency of the motor.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

A magnetic flux switching motor with a parallel structure, the present invention takes a three-phase 12/10 pole type motor as an example. The stator of the motor includes 12 U-shaped iron core units, 6 high-coercivity permanent magnets (NdFeB permanent magnets are used in this embodiment) and 6 low-coercivity permanent magnets (AlNiCo is used in this embodiment), Among them, 6 high-coercivity permanent magnets adopt tangential magnetization. Grooves are formed between two adjacent iron core units, and 6 high-coercivity permanent magnets and 6 low-coercivity permanent magnets are respectively embedded in 12 In each groove, the types of permanent magnets inlaid in adjacent grooves are different, and the magnetization directions of adjacent high-coercivity permanent magnets are the same. A magnetic modulation pulse coil is arranged on each low-coercivity permanent magnet, and the current direction of the adjacent magnetic modulation pulse coils is the same, and all the magnetic modulation pulse coils are connected in series to form a magnetic modulation pulse winding. In this embodiment, the magnetic modulation pulse coil adopts a concentrated winding to reduce copper loss.

The magnetic modulation pulse winding only needs to add an instantaneous pulse current (that is, a short-term current to adjust the low-coercivity permanent magnet), and the excitation loss caused by this short-term current can be ignored, so it is better than the traditional The mixed field flux switching motor has high efficiency.

The 3-phase armature winding of the motor adopts symmetrical concentrated winding coils, and each concentrated armature coil straddles the stator poles composed of two adjacent U-shaped iron core units and the NdFeB permanent magnet sandwiched in the middle. In the slots on both sides, two symmetrical coils are connected in series or in parallel to form a phase armature winding. The A-phase armature winding is composed of A1 and A2 coils connected in series or in parallel; the B-phase and C-phase armature windings are analogized in turn, as shown in Figure 1.

In this embodiment, 10 salient poles are evenly distributed on the surface of the rotor, and there are no windings and permanent magnets on the rotor. The salient poles can be straight or oblique.

In this embodiment, the iron cores of the stator and rotor are made of magnetically permeable materials, while the rotating shaft may be made of magnetically permeable materials or non-magnetically permeable materials.

The hybrid magnetic steel magnetic flux switching memory motor designed by the present invention can be used for both electric operation and power generation operation; it can be either an inner rotor motor or an outer rotor motor.

The above embodiments are only to illustrate the technical ideas of the present invention, and can not limit the protection scope of the present invention with this. All technical ideas proposed in accordance with the present invention, any changes made on the basis of technical solutions, all fall within the protection scope of the present invention. Inside.

Claims (8)

1. A hybrid magnetic steel magnetic flux switching memory motor is characterized in that: the stator of the motor comprises n iron core units, n/2 high coercive force permanent magnets and n/2 low coercive force permanent magnets, Among them, n/2 high-coercivity permanent magnets are magnetized tangentially, and grooves are formed between two adjacent iron core units, n/2 high-coercivity permanent magnets and n/2 low-coercivity permanent magnets The permanent magnets are respectively embedded in n grooves, and the types of permanent magnets embedded in adjacent grooves are different, and the magnetization directions of adjacent high-coercivity permanent magnets are the same; each low-coercivity permanent magnet is equipped with Magnetic modulation pulse coils, and adjacent magnetic modulation pulse coils are supplied with the same current direction, and all magnetic modulation pulse coils are connected in series to form a magnetic modulation pulse winding. 2. A hybrid magnetic steel flux switching memory motor according to claim 1, characterized in that: said high coercivity permanent magnets are NdFeB permanent magnets. 3 . The hybrid magnetic steel flux switching memory motor according to claim 1 , wherein the low-coercivity permanent magnet is an alnico permanent magnet. 4 . 4. A hybrid magnetic steel flux switching memory motor according to claim 1, characterized in that: the magnetic modulation pulse winding adopts a concentrated winding. 5. A hybrid magnetic steel flux switching memory motor according to claim 1, characterized in that: the stator of the motor is also provided with an armature winding, and the armature winding adopts a symmetrical centralized winding, and each armature The coil straddles the grooves on both sides of the stator pole composed of two adjacent iron core units and the high coercivity permanent magnet embedded in the middle, and two radially symmetrical armature coils are connected in series or in parallel to form a phase armature winding. 6. A hybrid magnetic steel flux switching memory motor according to claim 1, characterized in that salient poles are evenly distributed on the rotor surface of the motor, and there are no windings and permanent magnets on the rotor. 7. A hybrid magnetic steel flux switching memory motor according to claim 6, characterized in that: the salient poles on the rotor are straight poles or oblique poles. 8. A hybrid magnetic steel flux switching memory motor according to claim 1, characterized in that: both the stator and rotor cores of the motor are made of magnetically permeable materials.