WO2004086594A1

WO2004086594A1 - Star delta connection bias magnetic type reluctance motor

Info

Publication number: WO2004086594A1
Application number: PCT/CN2004/000163
Authority: WO
Inventors: Zhengfeng Zhu
Original assignee: Zhengfeng Zhu
Priority date: 2003-03-26
Filing date: 2004-03-02
Publication date: 2004-10-07
Also published as: CN2622919Y

Abstract

This invention relates to a star delta connection bias magnetic type reluctance motor, it includes housing, stator and rotor its character is stator has driving windings and bias magnetic windings, and the driving windings is star connection with the midpoint impending and the bias magnetic windings is provided with bias magnetic current afer connecting the head and the end. The invention is bias magnetic directly, the bias magnetic windings and driving windings has the same magnetic circuit, which will avoid the two windings effecting each and disturbing each other, and in favor of generating base wave by driving windings, preventing high harmonic generated and improving motor performance. The bias magnetic motor is drived by AC, which can improving power factor and inducing driving power by times and in favor of generating base wave by driving windings, preventing high harmonic generated and improving motor damp performance. The cheaper, simple bias magnetic motor has the similar driving performance with the Synchronization motor, their drive circuit adapt each other, that is exciting magnet or permanent manget device on the rotor of synchronization motor be arranged on the stator, which can be a new type motor has reluctance and synchronization two function at one time.

Description

Star angle connection bias magnetic reluctance motor

The invention belongs to the field of electromechanical, and particularly relates to an improvement of a reluctance motor or a reactive motor, and provides a star-connected bias magnet reluctance motor. Background technique

Reluctance motors (also known as reactive motors) are generally considered to be large in pulse vibration, low in efficiency, and complex in driving. Therefore, they are not as widely used as DC motors, asynchronous motors, and synchronous motors. They are commonly used as stepper motors and thyristors. Motor. The reluctance motor uses a DC ripple current as a body motion. Taking a three-phase reluctance motor as an example, in the case of the current chopper type drive circuit, at low speed, the motor current is equivalent to a rectangular wave. Analyze rectangular waves, including: DC + fundamental + third harmonic + fifth harmonic + ... and other components. The DC component ensures that the total flux is always a one-way flux, which is necessary for the normal operation of the reluctance motor, and the fundamental component is equivalent to the part of the AC motor that generates the rotating magnetic field, and the function is three, five times, etc. The subharmonic component is a harmful component that causes motor vibration and heat generation. Retaining the DC component and the fundamental component, eliminating harmonic components, the performance of the reluctance motor is greatly improved. The unidirectional magnetic flux generated by the DC component can be replaced by an additional biasing method. ("Polar magnetism" is named after the bias magnetic head of the recorder, which is similar to the "bias current" principle in the transistor circuit.)

The object of the present invention is to provide a biased magnetic flux for the normal operation of the motor by using a separately added bias winding on the stator, thereby splitting the excitation and the drive, and designing a star-connected bias magnetoresistive motor. .

The technical solution of the present invention is realized as follows: A bias magnetic reluctance motor comprising a casing, a stator and a rotor, wherein the stator is provided with a driving winding and a biasing winding, and the body winding is star-connected. The midpoint is suspended, and the biasing magnetic winding is connected to the magnetic pole current after the end-to-end series connection, which is simply referred to as a star-corner connection type. The technical scheme adopts direct biasing, and the bias magnetic winding and the trunk winding share a magnetic circuit, and the special phase and phase connection manner is used to offset the mutual influence between the two, mutual interference, and the connection of the external circuit is used as a bias. The magnetic winding provides a dedicated bias current that produces a bias.

The invention adopts this method, proposes a DC component, and adopts a bias magnetic substitution, which is beneficial to improve and perfect the body winding, further suppress the generation of higher harmonics, suppress the pulse vibration, and can also reduce the driving power by several times. The improved motor performance is similar to that of a synchronous motor, and the drive circuit is fully compatible with it. In principle, it is equivalent to the same The excitation device on the rotor of the motor is moved to the stator. If the multi-tooth structure of the stepper motor is retained, coupled with the modern high-frequency switching converter technology, the bias magnet motor not only has the best performance-price ratio, but also becomes the motor with the largest specific power. BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with specific legends:

Figure 1 is a basic connection diagram of the driving winding and the biasing winding of the three-phase bias magnetic reluctance motor connected to the star angle;

Figure 2 is a series connection main body circuit diagram;

Figure 3 is a schematic diagram of the arrangement of the pole pitch magnetic winding and its stator poles;

Figure 4 is a wiring diagram of a three-phase two-pole concentrated bias winding and a distributed drive winding. Detailed ways

Embodiment 1 - Taking a three-phase reluctance motor as an example, each winding of the original magnetic group motor is divided into two, forming two independent windings, one being a body winding and the other being a bias winding. Referring to Fig. 1, a star-corner connected bias magnet reluctance motor includes a casing, a stator and a rotor, wherein the stator is provided with a body winding 1 and a bias winding 2, and the body winding 1 is connected by a star connection. The point is suspended, the first end is taken out, which are respectively A, B, C end points, which is equivalent to the star connection method of the three-phase AC motor; and the bias winding 2 is connected with the bias current after the end-to-end series connection, similar to the triangle connection method. Referred to as the star angle joint method.

Referring to Fig. 2, when the number of turns of the body winding and the bias winding are the same, the series connection as shown in the figure can be used. In the figure, the switch K is an electronic switch, and a thyristor, a power transistor, a power FET, etc. can be selected. Assume that the current flows positively into the motor port A, writing: A, when flowing out of port A, write the same as Δ, B, and C ports. Let the switches Ka, Kb, and Kc be energized, and Kb, Kc, and Ka will not work. At this time, the power-on status is written: AB£. Similar phase can be written out. The phase sequence of three-phase 1 2 power-on is as follows:

A B C , A _, A B _C , B _C , C A B _A ^ B C A.^ , C A B , C B,

C AJ_, A_B A B C ·.. ·.·.

Among them, there are two kinds of 6-shot power-on methods, of course, one of them can also be used.

Bias magnets can also use AC bias (similar to a series motor) to operate from an AC or a swing source. At this time, the switching element can use an inexpensive and simple driving element such as a bidirectional thyristor. At this time, the driving frequency of the bias magnet should be one order of magnitude lower than the frequency of the AC power source. This method only works for some special ones. Low speed drive occasions.

In addition, for the excitation type DC motor, the connection between the field winding and the rotor is: excitation, shunt excitation, series excitation, and compound excitation. Similarly, the connection between the biasing magnetic winding and the body winding in the bias magnet motor also has: respectively, connected, series, parallel, and double. Different connection methods require different body circuits for different applications.

In principle, all drive circuits for coaxial motors and hybrid stepper motors are basically suitable for the drive of a star-connected bias magnet motor. The series connection shown in Figure 2 is the simplest. If you do not pursue a fast response speed, only for general speed control purposes, access to C l, C 2 (dotted line in the figure) can further improve the stability of low speed. Embodiment 2:

Referring to Fig. 3 (a), the drive winding turns on the concentrated winding 1, and the bias winding uses a pair of full-pole windings 2. By replacing the small bias windings with full-pole windings, a large amount of copper wire can be saved and the workload can be reduced. The structure shown in Fig. 3(b) is a six-toothed stator, and its structure is composed of a support housing 1 and a stator 2. In the tooth groove shown in Fig. 3 (b), except for the bias winding winding groove 26, the remaining body winding winding groove 25 can be reduced by half, so that the tooth groove can be further shortened, the yoke size can be reduced, and the stator steel can be saved. Tablet consumption. The large cogging has both the biasing magnetic winding and the body winding, so it is the same size as a normal reluctance motor. The small cogging only needs to accommodate the body winding and can be twice as small as the large tooth groove. The size of the yoke at the large cogging is thin, but only the bias magnetic flux is passed, and the method of thickening the iron casing can be used (Fig. 3 adopts an elliptical unequal-section outer casing, which can make full use of the material), and the outer casing is used as an auxiliary bias magnetic field. Yoke to solve. The structure simplifies the manufacturing process while saving the core material. Figure 1 (c) shows the external wiring diagram, using star connection. Embodiment 3:

Referring to Figure 4, the drive windings are either concentrated or distributed with full-pole windings, and the multi-phase bias still retains the concentrated windings. When driven by the full-pole winding, the number of winding turns can be reduced to half of the original, which not only saves the copper wire, but also effectively reduces the equivalent commutation inductance, improves the power factor, and further improves the waveform, improving the operation smoothly. Sex.

Similarly, the drive windings can be used like synchronous motors and asynchronous motors. Other pole pitches and other forms of distributed windings can be used to match different driving modes to improve performance and price.

The above structure is also applicable to a three-phase or more bias magnet motor, and is also applicable to a multi-phase multi-pole motor.

In addition, the stator is a multi-stator structure, and the bias windings can be concentrated into a large coil, which is wound in a circumferential direction. Placed between multiple stator magnetic circuits, the multi-phase drive windings on multiple stators can be either centralized or distributed windings. For special occasions, such as: Double air gap disc or cup rotor motor, the drive circuit cost is lower than the traditional reluctance motor.

Claims

Claim

1. A star-corner connected bias magnet reluctance motor, comprising a casing, a stator and a rotor, characterized in that a stator winding and a biasing magnetic winding are arranged on the stator, and the body winding is star-connected, and the midpoint is suspended. The bias winding is connected to the bias current after the end-to-end series connection.

2. The star-corner biased reluctance motor according to claim 1, wherein the multi-phase drive winding adopts a concentrated winding, and the bias magnetic winding adopts a full-pole pitch winding, and the number of windings is equal to the number of magnetic poles per phase.

3. The star-corner biased reluctance motor according to claim 1, wherein the body winding is a concentrated or distributed winding, and the plurality of cabinet bias windings are concentrated windings.

4. The star-corner biased reluctance motor according to claim 1, wherein the stator has a multi-stator structure, and the bias windings can be concentrated into a large coil, which is wound in a circumferential direction and placed in a multi-stator magnet. Between the roads, the multiphase drive windings on multiple stators can be either centralized or distributed.