초록 ▼

An electric control apparatus of an induction motor is provided with a flux current controller for controlling the flux current of the motor and a secondary current controller for controlling the secondary current of the motor. A pulse generator circuit is disposed to control the amplitude, frequenc

An electric control apparatus of an induction motor is provided with a flux current controller for controlling the flux current of the motor and a secondary current controller for controlling the secondary current of the motor. A pulse generator circuit is disposed to control the amplitude, frequency and phase angle of the primary current of the motor according to output signals of the flux current controller and secondary current controller. The primary voltage and frequency to be applied to the motor are controlled by pulse signals from the pulse generator circuit. This pulse generator circuit includes a primary voltage setting zone for setting the primary voltage of the induction motor and a primary voltage detecting zone for detecting the primary voltage of the motor. A voltage regulator is disposed to put out a signal equivalent to the change of the secondary resistance of the induction motor according to the deviation of the voltage between the primary voltage detecting zone and the primary voltage setting zone. A correcting controlling zone is disposed in the pulse generator circuit to perform a controlling action of correcting the frequency, which is one of the control objects of the pulse generator circuit, according to the output signal of the voltage regulator.

대표청구항 ▼

An electric control apparatus for an induction motor comprising flux current controller means producing a signal for controlling the exciting current of the induction motor in accordance with a flux command; secondary current controller means producing a signal for controlling the secondary current

An electric control apparatus for an induction motor comprising flux current controller means producing a signal for controlling the exciting current of the induction motor in accordance with a flux command; secondary current controller means producing a signal for controlling the secondary current of the motor in accordance with a speed command; pulse generator means for producing outputs for controlling the amplitude, frequency and phase angle of the primary current of the motor in the form of pulse signals according to the output signals of said flux current controller means and said secondary current controller means; frequency converter means for controlling the voltage and frequency to be applied to the motor according to the pulse signals from said pulse generator means; primary voltage setting means responsive to said flux command for setting the primary voltage of the motor, primary voltage detecting means for detecting the primary voltage of the motor, voltage regulator means for putting out a signal having a value equivalent to the change of the secondary resistance of the motor according to the difference between the output of said primary voltage detecting means and the output of said primary voltage setting means, and correcting controlling means connected to said pulse generator means for correcting the output for controlling said frequency of the primary current of the motor according to a signal proportional to slip frequency derived from the output signal of said secondary current controller means and a signal proportional to slip frequency change derived from the output signal of said voltage regulator means.