Automatic motor current regulation frequency converter
A motor current and automatic adjustment technology, which is applied in the direction of AC motor control, AC power input conversion to AC power output, electrical components, etc., can solve the problems of motor current unbalanced motor, etc., and achieve the effect of solving unstable operation
Inactive Publication Date: 2012-11-14
XUZHOU RIPE INVERTER TECH
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[0005] The purpose of the present invention is to provide an automatic motor current-adjusting frequency converter, which can effectively reduce problems such as motor instability, motor current imbalance, and motor overheating caused by motor internal resistance changes and load fluctuations.
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[0017] Such as figure 1 As shown, the three-phase AC power input first enters the rectifier circuit, then is filtered by the filter circuit to become a stable DC, and then input to the inverter circuit. The rectifier circuit is input to the switching power supply circuit, and the switching power supply circuit provides power for the CPU control board and the driver board: +5V for the CPU control circuit power, +24V for the external input and output signal power, +15V, -15V for the signal acquisition circuit power, four The AC 22V supply drive circuit power supply. The drive signal is generated by the CPU control circuit. The CPU control circuit contains a microprocessor. The internal program is calculated to generate a pulse width modulation signal and transmit it to the IGBT drive circuit. The IGBT drive circuit is first isolated by the optocoupler, and then the signal is amplified to drive the IGBT module. The six switch tubes in the circuit form a sinusoidal waveform with ...
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The invention discloses an automatic motor current regulation frequency converter which belongs to the technical field of power electronics and electric drives. Based on the original universal frequency converter, a signal acquisition circuit is added in the frequency converter, and detects the three-phase current and voltage in real time, a central processing unit (CPU) computes the drive signal difference according to the detection value, an insulated gate bipolar translator (IGBT) drive signal is regulated in real time through a pulse width modulation mode, so the current balance and voltage balance of a driven motor are realized. The automatic motor current regulation frequency converter has the beneficial effects that the current and the voltage of the driven motor can be controlled, so the problems of unstable motor operation, unbalanced motor current, overheating motor and the like which are caused by the fact that the three-phase internal resistance and the wire resistance of the motor are different are solved.
Description
technical field [0001] The invention relates to a general-purpose frequency converter, in particular to an automatic motor current-adjusting frequency converter, which belongs to the technical field of power electronics and electric transmission. Background technique [0002] Since the 1960s, AC motors have gradually become the main equipment in the mechanical field due to their simple structure and easy maintenance. Therefore, the speed regulation of AC motors has become an urgent problem to be solved. At present, the speed regulation methods of AC motors mainly include rotor Series resistance speed regulation, step-down voltage speed regulation, slip clutch speed regulation, pole-changing logarithmic speed regulation and frequency conversion speed regulation. [0003] Since the 1990s, with the development of power electronics technology, the frequency conversion speed regulation technology using power electronic devices has developed rapidly, especially the emergence of la...
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IPC IPC(8): H02M5/458H02P27/08
Inventor 陆磊陆音
Owner XUZHOU RIPE INVERTER TECH