CN113078748A

CN113078748A - Novel auxiliary excitation brushless double-fed motor structure

Info

Publication number: CN113078748A
Application number: CN202110358911.1A
Authority: CN
Inventors: 周瑞; 肖芳; 徐维豪
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-07-06

Abstract

The invention relates to the technical field of motors, and proposes a novel auxiliary excitation brushless doubly-fed motor structure. The structure of the invention has small current value, low loss and high motor efficiency in the wound rotor of the brushless doubly-fed motor. The key to its technical solution is: the motor is an outer stator and an inner rotor structure; the stator has 2/6 poles and 12 slots, two sets of windings, the winding ends are wired in different ways, and the stator power winding is connected in parallel with capacitors; every other tooth of the stator is embedded with a permanent magnet. ; The rotor is a wound rotor with 36 slots, the rotor is a deep slot, and the rotor winding is three layers. The auxiliary excitation of the parallel capacitor on the side of the power winding can reduce the current in the wound rotor, reduce the copper consumption in the rotor, and improve the efficiency of the motor; the permanent magnet on the tip of the stator can enhance the air gap magnetic field and improve the magnetic field waveform; the three-layer winding of the rotor The arrangement of the windings is made more flexible, and the arrangement is appropriately selected, which can realize the strong coupling between the magnetic field of the stator double winding and the magnetic field of the rotor winding.

Description

Novel auxiliary excitation brushless double-fed motor structure

Technical Field

The invention relates to the technical field of motors, in particular to a novel auxiliary excitation brushless double-fed motor structure.

Background

Brushless doubly-fed machine rotor structures generally fall into three categories: reluctance type, cage type, and wire wound type.

Winding type rotor brushless double-fed motor belongs to induction type brushless double-fed motor, and motor rotor winding can the response generate current under the synthetic magnetic field effect of air gap promptly, and then produces the rotor fundamental wave magnetic field of two different pole pairs. The winding type rotor structure has the advantages that the conductor utilization rate is high, the design is flexible, the air gap magnetomotive force harmonic content can be weakened by changing variables such as the winding layer number, the number of turns of a coil and the pitch, and the vibration and the loss caused by the harmonic are reduced; at the same time, the distribution of the magnetic field and the current is completely determined by the winding scheme itself, and thus does not change with the change of the load size.

How to strengthen the air gap magnetic field, reduce the rotor winding current, reduce the winding loss and have great significance to the wound rotor brushless double-fed motor.

Disclosure of Invention

The invention aims to solve the problem of providing a brushless double-fed motor structure which has the advantages of air gap auxiliary excitation, small current value in a rotor, low loss and high motor efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme: the motor is an outer stator inner rotor structure; the stator 2/6 pole 12 slot, two sets of windings, the winding end wiring mode is different, the stator power winding connects the capacitor in parallel; the tooth top of every other tooth of the stator is embedded with a permanent magnet; the rotor is a wound rotor with 36 slots, the rotor is a deep slot, and the rotor winding is of a three-layer structure.

In the technical scheme, the two sets of windings of the stator are arranged, the power winding is positioned at the bottom of the slot, and the control winding is positioned at the slot opening.

In the above technical solution, the capacitance of the stator power winding in parallel is Δ connection.

In the technical scheme, the 6 permanent magnets on the motor stator teeth are made of neodymium iron boron materials.

The invention has the following beneficial effects: the power winding side is connected with the capacitor auxiliary excitation in parallel, so that the current in the wound rotor can be reduced, the copper consumption in the rotor is reduced, and the motor efficiency is improved; the permanent magnet at the tooth top of the stator can enhance the air gap magnetic field and improve the waveform of the magnetic field; the three-layer winding of the rotor enables the winding arrangement mode to be more flexible, and the arrangement mode is properly selected, so that the strong coupling of the stator double-winding magnetic field and the rotor winding magnetic field can be realized.

Drawings

Fig. 1 is a structural schematic diagram of a novel auxiliary excitation brushless doubly-fed motor.

As shown in fig. 1: 1, a stator; 2, permanent magnets; 3 stator power winding; 4 stator control winding; 5 rotor.

Fig. 2 is a schematic view of the stator winding principle of the motor.

Fig. 3 is a schematic view of a motor rotor slot and winding layering.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

Referring to fig. 1, 2 and 3, a novel auxiliary excitation brushless doubly-fed motor structure adopts the following technical scheme: the motor is an outer stator inner rotor structure; the stator 2/6 pole 12 slot, two sets of windings, the winding end wiring mode is different, the stator power winding connects the capacitor in parallel; the tooth top of every other tooth of the stator is embedded with a permanent magnet; the rotor is a wound rotor with 36 slots, the rotor is a deep slot, and the rotor winding is of a three-layer structure.

Referring to fig. 1, the stator has two sets of windings, the power winding is located at the bottom of the slot, and the control winding is located at the notch. The span of the end part of the power winding is large, and the span of the end part of the control winding is small, so that the arrangement mode is favorable for winding inserting.

Referring to fig. 2, the parallel capacitance of the stator power winding is delta connection, and the auxiliary excitation of the parallel capacitance at the power winding side can reduce the current in the wound rotor, reduce the copper consumption in the rotor and improve the motor efficiency.

Referring to fig. 1, 6 permanent magnets on the motor stator teeth are made of neodymium iron boron materials, and the permanent magnets on the stator tooth tops can enhance an air gap magnetic field and improve the waveform of the magnetic field.

Referring to fig. 3, the rotor winding of the motor is of a three-layer structure, the rotor three-layer winding enables the winding arrangement mode to be more flexible, and the arrangement mode is properly selected, so that the strong coupling of a stator double-winding magnetic field and a rotor winding magnetic field can be realized.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims

1. The utility model provides a novel supplementary excitation brushless doubly-fed machine structure which characterized in that: the motor is an outer stator inner rotor structure; the stator 2/6 pole 12 slot, two sets of windings, the winding end wiring mode is different, the stator power winding connects the capacitor in parallel; the tooth top of every other tooth of the stator is embedded with a permanent magnet; the rotor is a wound rotor with 36 slots, the rotor is a deep slot, and the rotor winding is of a three-layer structure.

2. A novel auxiliary excitation brushless doubly-fed machine structure as claimed in claim 1, wherein: and the power winding is positioned at the bottom of the slot, and the control winding is positioned at the notch.

3. A novel auxiliary excitation brushless doubly-fed machine structure as claimed in claim 1, wherein: the capacitance of the stator power winding in parallel connection is delta connection.

4. A novel auxiliary excitation brushless doubly-fed machine structure as claimed in claim 1, wherein: the 6 permanent magnets on the stator teeth are made of neodymium iron boron materials.