Alternating-current asynchronous motor frequency converter without speed sensor

A technology of AC asynchronous motor and frequency converter, which is applied in the direction of AC motor control, generator control, motor generator control, etc., which can solve the problems of inconvenient debugging and monitoring of frequency converters.

Inactive Publication Date: 2011-06-29
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to develop a PC-based inverter debugging and monitoring software for the actual situation that current invert

Method used

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  • Alternating-current asynchronous motor frequency converter without speed sensor
  • Alternating-current asynchronous motor frequency converter without speed sensor
  • Alternating-current asynchronous motor frequency converter without speed sensor

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, it is a main loop of closed-loop vector control of an AC asynchronous motor without a speed sensor. The main contents of the offline identification of the motor parameters and the online identification of the speed include:

[0028] 1. Off-line identification of stator resistance

[0029] Such as figure 1 As shown, keep T3 and T5 off, keep T2, T4 and T6 on, apply a high-frequency pulse to T1, first set a small duty cycle D, and then gradually increase the duty cycle until the output current reaches Rated value, at this time, detect the output current value of the motor and the duty cycle D, and then calculate the stator resistance value. Equivalent circuit such as figure 2 (a) shown.

[0030] exist figure 2 In the circuit ...

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Abstract

The invention relates to an alternating-current asynchronous motor frequency converter without a speed sensor. In the frequency converter, a personal computer (PC)-based frequency converter online debugging and monitoring software, a communication mechanism, parameter identification of an alternating-current asynchronous motor, and alternating-current asynchronous motor rotating speed identification are involved, wherein the PC-based frequency converter online debugging and monitoring software can set related parameters of the frequency converter, distribute a control command, dynamically display the related parameters of the frequency converter and an alternating-current asynchronous motor in a literary form, and dynamically display the waveforms of a rotating speed, a torque, a stator voltage and a stator current of the alternating-current asynchronous motor in a graphical form; the communication mechanism is on the basis of any one serial bus of Ethernet/a universal serial bus (UBS)/a recommend standard 485 (RS485)/a recommend standard 232 (RS232) and realizes bidirectional data communication between the debugging software and the frequency converter; the parameter identification of the alternating-current asynchronous motor comprises stator resistance, rotor resistance, stator leakage inductance, rotor leakage inductance, stator and rotor mutual inductance and total leakage inductance; and the alternating-current asynchronous motor rotating speed identification is on the basis of a model reference adaptive theory.

Description

technical field [0001] The present invention relates to an AC asynchronous motor frequency converter without a speed sensor, more specifically, it relates to a PC-based frequency converter debugging and monitoring software, which is realized based on a communication mechanism of any serial bus such as Ethernet, USB, RS485, or RS232 Two-way data communication between the software and the frequency converter, parameter identification of AC asynchronous motor, speed identification of AC asynchronous motor, frequency converter with speed sensorless vector control mode. Background technique [0002] The setting or debugging of the current domestic frequency converter is mostly realized through the operation panel of the frequency converter. First, the operation is cumbersome, and moreover, it is impossible to accurately judge the changing trend of the stator voltage, stator battery, speed and torque of the AC asynchronous motor within a period of time. However, if the PC-based in...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/00H02P27/04
Inventor 高军礼黎国才陈世军
Owner GUANGDONG UNIV OF TECH
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