Abstract: A motor energy recycling device is connected to a motor, a voltage regulating power capacitor, and a switch unit, for storing energy released by the motor. The motor energy recycling device include a switching device having first to third ends for being switched to connect the third end with the first end or second end; a first diode unit; a first capacitor connected to the motor and the first diode unit for using energy released by the motor to charge the first capacitor; a first inductor; a second capacitor; a second diode unit; and a second inductor connected between the second end and the second diode and between the voltage regulating power capacitor and the second capacitor for charging the voltage regulating power capacitor via the second inductor to accomplish an energy recycling.

Abstract: A system for controlling the start-up sequence of an electric motor includes a contactor relay for supplying polyphase operating voltage to the motor. A plurality of output circuits are respectively coupled between the motor and the relay contacts. Each output circuit is responsive to an output control signal applied to an input thereof for applying the operating voltage to the motor. An acceleration ramp generator is responsive to a motor control circuit which energizes the relay for providing a first signal which gradually rises upon the initial activation thereof. A phase control ramp generator is responsive to the application of the polyphase operating voltage to provide a second signal which decreases from a given level upon the initial application of the operating voltage. A plurality of comparators are provided each comparator having first and second inputs respectively coupled to receive each phase control ramp generator signal and the acceleration ramp generator signal.