CN103259382B - One opens winding mixed excitation electric machine - Google Patents

Abstract

The invention discloses one and open winding mixed excitation electric machine, comprise stator, rotor, stator tooth, permanent magnet in described rotor, be embedded in armature winding between described stator tooth; Also comprise the electric excitation winding be wound on described stator tooth; In described stator tooth, half stator tooth is embedded with armature winding, and second half stator tooth embedded without winding is as fault-tolerant teeth; Described armature winding is the centralized winding of being isolated by fault-tolerant teeth, and the first and last end of winding is normal open-circuit condition, and winding connects without neutral point.This motor solves the problem of the narrow and fault-tolerant operation ability of speed adjustable range that conventional permanent magnet motor exists, and is ensureing on the basis that its Magnetic circuit characters is constant simultaneously, solves out the permanent magnet demagnetization and excitation regulation difficult problem that exist in winding permanent magnet motor.

Description

An open-winding hybrid excitation motor

technical field

The invention relates to an open-winding hybrid excitation motor device, belonging to a new type of special motor technology.

Background technique

Pure electric vehicles and plug-in hybrid vehicles mainly rely on motor drive systems to provide power. No matter what type of electric vehicle, the motor drive system is an indispensable part. At present, most of the electric vehicles that have been put into commercial operation at home and abroad use permanent magnet motor drive system devices. However, traditional permanent magnet motors have problems such as narrow speed regulation range and poor fault-tolerant operation ability. The open-winding structure can solve the above problems and ensure its magnetic circuit characteristics, and the motor still has the advantages of high power density and high efficiency, and also meets the needs of electric vehicles for the fault-tolerant operation of the motor drive system. However, open-winding permanent magnet motors still have the problems of permanent magnet demagnetization and excitation adjustment difficulties. The hybrid excitation motor is an organic combination of permanent magnet excitation and electric excitation to overcome the difficulties of permanent magnet demagnetization and excitation adjustment. However, there are problems such as narrow speed range and poor fault-tolerant operation ability.

Contents of the invention

Purpose of the invention: Aiming at the above-mentioned prior art, an open-winding hybrid excitation motor is proposed to solve the problems of narrow speed regulation range and poor fault-tolerant operation ability of traditional permanent magnet motors, while ensuring that its magnetic circuit characteristics remain unchanged. Solve the problems of permanent magnet demagnetization and excitation adjustment difficulties in open-winding permanent magnet motors.

Technical solution: an open-winding hybrid excitation motor, including a stator, a rotor, stator teeth, and permanent magnets located in the rotor; it also includes an electric excitation winding wound on the stator teeth; half of the stator teeth The teeth are embedded with three-phase armature windings, and the other half of the stator teeth without three-phase armature windings are embedded as fault-tolerant teeth; wherein, the three-phase armature windings are centralized windings, and the first and end ends of each phase of the armature windings are normal Open circuit condition, and there is no neutral point connection between the armature windings of each phase.

As an improvement of the present invention, the electric excitation winding is a single-phase electric excitation winding.

As a further improvement of the present invention, the permanent magnets are arranged in a "V" shape in the rotor.

As a further improvement of the present invention, the motor is powered by double inverters.

Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects: (1) The motor generates the main magnetic field jointly by two excitation sources of permanent magnet excitation and electric excitation. In these two kinds of magnetic potential sources, the permanent magnet is The main magnetic potential source, the electric excitation magnetic potential is used as the auxiliary magnetic potential source. When the motor is working normally, the electric excitation magnetic potential mainly plays the role of increasing or weakening the magnetic flux of the main magnetic circuit, so as to realize the adjustable air gap magnetic field of the motor; The excitation current generates an excitation magnetic field, which interacts with the armature winding to generate sufficient torque to ensure the operation of the system; when the motor drive system fails, since the armature winding is an open winding structure, there is no neutral point connection between the phase windings , the armature windings of each phase work independently, forming an open winding structure, so the current or bus voltage of the faulty phase will not affect the work of the armature windings of other normal phases, effectively eliminating the influence between the armature windings of each phase, thereby improving The reliability of the motor itself. (2) Half of the stator teeth are designed as fault-tolerant teeth, and there is no armature winding embedded, which provides a magnetic circuit for the permanent magnet and the armature winding, so that the independence of the circuit, magnetic circuit and temperature field between the motor phases is realized, thereby It has high reliability and the ability to operate with faults. (3) The permanent magnet in the rotor presents a "V" shape, so that the permanent magnet has both radial magnetization and tangential magnetization, effectively concentrating the magnetic flux, increasing the torque of the motor, and effectively widening the speed range of the motor. (4) The dual-inverter structure based on open winding not only reduces the number of power devices used, but also solves the problem of no midpoint voltage imbalance, reduces switching losses, and improves the efficiency of the inverter. (5) The motor structure can reduce the harmonic content of the output voltage and increase the output voltage level at a lower switching frequency, which is suitable for electric vehicle driving conditions, not only reducing the volume, weight and Manufacturing cost, and can effectively solve problems such as difficulty in speed regulation of permanent magnet motors for electric vehicles.

Description of drawings

Fig. 1 is the schematic diagram of motor structure of the present invention;

Among them: 1 is the stator, 2 is the rotor, 3 is the armature winding, 4 is the electric excitation winding, 5 is the permanent magnet, 6 is the stator tooth;

Fig. 2 is a transverse sectional view of the motor of the present invention.

detailed description

The present invention will be further explained below in conjunction with the accompanying drawings.

An open-winding hybrid excitation motor includes a stator 1 , a rotor 2 , stator teeth 6 , permanent magnets 5 inside the rotor 2 , and electric excitation windings 4 wound on the stator teeth 6 . Half of the stator teeth 6 are embedded with the three-phase armature winding 3, and the other half of the stator teeth without the three-phase armature winding are used as fault-tolerant teeth, that is, the fault-tolerant teeth and the stator teeth embedded with the three-phase armature winding 3 are arranged at intervals. Among them, the fault-tolerant tooth provides a magnetic circuit for the permanent magnet 5 and the three-phase armature winding 3; There is no neutral point connection between them, which constitutes an open winding structure.

Wherein, the electric excitation winding 4 is a single-phase electric excitation winding. The permanent magnet 5 is arranged in a "V" shape in the rotor 2 . At the same time, the motor is powered by dual inverters.

The working principle of the present invention is as follows: the motor generates the main magnetic field jointly by two kinds of excitation sources, permanent magnet excitation and electric excitation. Potential source. When the motor is working normally, the electric excitation magnetic potential mainly plays the role of increasing or weakening the magnetic flux of the main magnetic circuit, so as to realize the adjustable air gap magnetic field of the motor; The maximum excitation current generates an excitation magnetic field, which interacts with the three-phase armature windings to generate sufficient torque to ensure system operation requirements; There is no neutral point connection between them, so the armature windings of each phase work independently, so the current or bus voltage of the faulty phase will not affect the work of the armature windings of other normal phases, thereby effectively eliminating the influence between the armature windings of each phase, Thereby improving the reliability of the motor itself.

In the present invention, since half of the stator teeth are designed as fault-tolerant teeth, and no armature winding is embedded, a magnetic circuit is provided for the permanent magnet and the armature winding, so that the circuit, magnetic circuit and temperature field are realized between the phases of the motor. Independent, so that the motor has high reliability and the ability to operate with faults. Moreover, since the three-phase wound armature group of the motor adopts a centralized winding, the coupling between the phases is small, so it is easier to realize the decoupling between the phases, so that the fault-tolerant operation performance of the system is better. In addition, the permanent magnet in the rotor presents a "V" shape, so that the permanent magnet has both radial magnetization and tangential magnetization, effectively concentrating the magnetic flux, increasing the torque of the motor, and effectively widening the speed range of the motor.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. An open-winding hybrid excitation motor, including a stator (1), a rotor (2), a stator tooth (6), and a permanent magnet (5) located in the rotor (2); it is characterized in that: it also includes winding The electric excitation winding (4) on the stator teeth (6); half of the stator teeth (6) are embedded with three-phase armature windings (3), and the other half has no three-phase armature windings embedded in the stator The teeth are used as fault-tolerant teeth; wherein, the three-phase armature windings (3) are centralized windings, the beginning and end of each phase armature winding (3) are in a normally open state, and there is no Neutral connection. 2. An open-winding hybrid excitation motor according to claim 1, characterized in that: the electric excitation winding (4) is a single-phase electric excitation winding. 3. An open-winding hybrid excitation motor according to claim 1, characterized in that: the permanent magnet (5) is arranged in a "V" shape in the rotor (2). 4. An open-winding hybrid excitation motor according to claim 1, characterized in that the motor is powered by double inverters.