AC motor matrix type controller with DC excitation function

A DC excitation and AC motor technology, applied in the direction of single motor speed/torque control, conversion equipment that can be converted to DC without intermediate conversion, output power conversion device, etc., can solve the problem that energy is difficult to achieve two-way flow, contains high Sub-harmonics and other issues can be avoided to avoid intermediate DC links, reduce costs, and improve system efficiency

Inactive Publication Date: 2007-08-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this structure also has some inherent defects, such as high-order harmonics in the input current caused by chopping, and it is difficult for energy to flow in both directions.

Method used

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  • AC motor matrix type controller with DC excitation function
  • AC motor matrix type controller with DC excitation function
  • AC motor matrix type controller with DC excitation function

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Embodiment Construction

[0024] As shown in Figure 1, a kind of AC motor matrix controller with DC excitation function according to the present invention includes a three-phase AC-AC matrix converter circuit, an overvoltage absorbing circuit and a DC excitation regulation circuit, the AC motor and the power supply The overvoltage absorbing circuit is connected with both ends of the matrix converter through a three-phase AC matrix converter circuit, and the DC excitation circuit leads out the voltage at both ends of the capacitor of the overvoltage absorbing circuit.

[0025] In the present invention, the three-phase AC matrix converter is used as the main part of the motor controller, and its topology is shown in Fig. *3 Arranged in a matrix, each input phase and each output phase are connected with only one bidirectional switch. Its input side is connected to a three-phase AC power supply, and its output side is connected to a three-phase winding of a motor. Because the three-phase AC matrix convert...

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Abstract

Three ends of input and three ends of output in three phases AC-AC type matrix transform unit (MTU) of the controller are connected to power supply and AC motor respectively. MTU is composed of nine pieces of two-way switch arranged in 3*3 matrix. Each input and output phase is only connected to one piece of two-way switch. In overvoltage absorption circuit, output ends in phase in two sets of rectification bridge (RB) are connected, and clamping capacitor is connected between positive and negative poles. Leak resistance is connected to clamping capacitor in parallel. Three inputs and three outputs of RB are connected to inputs and outputs of MTU. DC exciting circuit fetches out voltage at two ends of the clamping capacitor. The invention realizes AC-AC direct conversion, and bidirectional energy flows realizes four-quadrant operation of motor. Using DC in overvoltage absorption circuit, exciting circuit reduces size and weight of controller.

Description

1. Technical field [0001] The invention relates to an AC motor controller, in particular to a novel AC motor matrix controller with a DC excitation function. 2. Background technology [0002] The AC motor with DC excitation function can easily adjust the motor magnetic field by controlling the DC excitation current. When this type of motor is used as a motor, it has a wider range of speed regulation and good control performance; when used as a generator, by adjusting the excitation magnetic field, it can ensure that the generator maintains a normal output voltage when the load changes. In addition, this type of motor has a self-demagnetization function during power generation operation, which improves the reliability of the system operation. This type of motor is divided into electric excitation structure and hybrid excitation structure from the motor structure. The former has broad application prospects in many industrial fields and military fields such as aerospace and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02M5/22H02M1/32
Inventor 仇红奎周波张绍
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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