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Brake control method for induction motor

A technology of induction motor and brake control, applied in motor generator control, control system, motor/generator/inverter limiter, etc., can solve problems such as poor braking performance, high cost, and inability to automatically track the maximum braking torque , to achieve high safety and ensure the effect of braking performance

Active Publication Date: 2012-02-15
WUXI ECOVI TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

This braking method will easily lead to an increase in the bus voltage of the inverter, so it is necessary to connect an energy loss circuit to the bus of the inverter to ensure that the bus voltage of the inverter is within the safe voltage range, the control is complicated, the cost is high, and this braking method cannot Ensure that the braking torque generated by it is always the maximum braking torque, that is, it cannot automatically track the maximum braking torque of the induction motor, and the braking performance is poor

Method used

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  • Brake control method for induction motor
  • Brake control method for induction motor
  • Brake control method for induction motor

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Embodiment Construction

[0030]Such as figure 1 As shown, the application system of the present invention is composed of an AC power supply, a frequency converter, an induction motor and a load connected in sequence, such as figure 2 As shown, the frequency converter includes a rectification and filtering module, a drive control chip and its peripheral circuit modules, a speed detection module, and an IGBT or IPM power module. Controlled by the drive control chip and its peripheral circuits, the drive control chip and its peripheral circuit modules output the PWM signal, and the IGBT or IPM power module converts the PWM signal into a voltage and outputs it to the induction motor. In order to detect the speed of the induction motor in real time, between the induction motor and the drive There is also a speed detection module between the control chip and its peripheral circuit modules, so that the drive control chip and its peripheral circuit modules can carry out a series of protection measures or rea...

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Abstract

The invention relates to a brake control method for a motor, in particular to the brake control method for an induction motor. The method is applied to a system consisting of an alternating current power supply, a frequency converter, the induction motor and a load. The control method comprises the following steps of: (1) determining voltage amplitude and a voltage angle during the braking of theinduction motor; and (2) controlling the output voltage of the frequency converter based on the determined voltage amplitude and the determined voltage angle, and automatically tracking the maximum braking torque of the induction motor on the premise of ensuring that the bus voltage of the frequency converter is constant or tends to be constant to ensure the braking performance of the induction motor. The braking of the induction motor under normal power supply and power failure conditions is met by adopting the same algorithm at the same time, so the algorithm is simplified.

Description

technical field [0001] The invention relates to a motor brake control method, in particular to an induction motor brake control method, which is applied to a system composed of an AC power supply, a frequency converter, an induction motor and a load. Background technique [0002] The so-called induction motor refers to an AC motor that generates electromagnetic torque through the interaction of the air gap rotating magnetic field and the induced current of the rotor winding, thereby realizing the conversion of electromechanical energy into mechanical energy. Except for special circumstances, the rotation speed of the rotor of the induction motor is always different from the rotation speed of the stator magnetic field, so it is also called asynchronous motor. Its application system is mainly composed of AC power supply, frequency converter, induction motor and load. Conventional induction motor braking methods generally use mechanical brakes, that is, an additional mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P3/18
Inventor 何志明周文忠黄雨王明仁
Owner WUXI ECOVI TECH
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