KR950002186A - Voltage / frequency pattern variable method of inverter circuit and its device - Google Patents

Abstract

The present invention is to change the voltage / frequency pattern of the inverter circuit in accordance with the change of the load, the voltage / frequency pattern variable method of the inverter circuit for the purpose of preventing the torque and the speed decreases due to the temperature rise of the motor during continuous operation And an apparatus, and an object of the present invention is to detect an inverter circuit driving a motor by inverting a DC voltage input according to a signal input from the outside into a three-phase AC voltage, and detecting a current fed back from the motor. Current amplifying means for converting the current obtained from the current detecting means into a corresponding voltage, amplifying the converted voltage by a predetermined level, and outputting the voltage value obtained by the voltage amplifying means. Select a voltage / frequency pattern set in the table to obtain a microcomputer that varies the voltage / frequency pattern of the inverter circuit. By is achieved.

Description

Voltage / frequency pattern variable method of inverter circuit and its device

Since this is an open matter, no full text was included.

1 is a configuration diagram of a motor driving device using a conventional inverter circuit. 2 is a voltage / frequency pattern conversion diagram of the inverter circuit during continuous motor drive of FIG. 3 is a diagram showing changes in current, torque, and motor temperature characteristics in accordance with a conventional continuous operation. 4 is a configuration diagram of a voltage / frequency pattern variable device of an interleaver circuit of the present invention.

Claims (3)

Searching the frequency change state at the initial stage of motor drive, searching whether the search result is the constant torque area when the frequency does not change, and when the search result is the constant torque area, the voltage value corresponding to the current value fed back from the motor a predetermined number of times. Searching for and averaging them, and matching the averaged voltage value to a voltage / frequency look-up table to select a corresponding voltage / frequency pattern and output the selected voltage / frequency pattern to output the output current of the inverter circuit. Voltage / frequency pattern variable method of the inverter circuit, characterized in that consisting of a step of adjusting. The method of claim 1, wherein the averaging of the voltage values comprises ipot = Average by Voltage / frequency pattern variable method of an inverter circuit characterized by the above-mentioned. Where ipot is the average value, T is the number of times to detect the current value, and i is the detected current value. Inverter circuit for driving the motor by inverting the DC voltage input in accordance with the control signal input from the outside into a three-phase AC voltage, current detection means for detecting a current fed back from the motor, and in the current detection means A voltage amplifying means for converting the obtained current into a corresponding voltage and amplifying the converted voltage by a predetermined level, and selecting a voltage / frequency pattern set in the look-up table according to the voltage value obtained by the voltage amplifying means. Inverter circuit voltage / frequency pattern variable device characterized in that it comprises a micom variable voltage / frequency pattern of the inverter circuit. ※ Note: The disclosure is based on the initial application.