초록 ▼

A four quadrant control system for a brushless D.C. motor wherein the windings are energized via a drive switching circuit in a bridge configuration and the switching circuit is in turn controlled by a read-only memory. Pulse-width modulation control signals and position signals are supplied to the

A four quadrant control system for a brushless D.C. motor wherein the windings are energized via a drive switching circuit in a bridge configuration and the switching circuit is in turn controlled by a read-only memory. Pulse-width modulation control signals and position signals are supplied to the read-only memory as addresses together with other control signals. The system operates in a regenerative mode when changing direction and automatically makes a smooth transition into a motoring mode when the back EMF of the motor is no longer large enough to satisfy the requirements of the current loop.

대표청구항 ▼

A system for controlling energization of an electric motor from an electric power source, comprising; a switching circuit including switching devices for selectively connecting windings of the motor to the power source in accordance with the rotor position of the motor; an error signal generating ci

A system for controlling energization of an electric motor from an electric power source, comprising; a switching circuit including switching devices for selectively connecting windings of the motor to the power source in accordance with the rotor position of the motor; an error signal generating circuit for providing an error signal according to the difference between a control command an an actual motor condition; and a pulse-width modultion control circuit responsive to said error signal and operatively connected to control said switching devices in said switching circuit to provide increased duty cycle pulse-width modulation control of said switching devices as said error signal approaches zero when operating the motor in a regenerative mode, and to provide decreased duty cycle pulse-width modulation control of said switching devices as said error signal approaches zero when operating the motor in a motoring mode.