Patent ID: 7834577
Filing Date: 2010-11-16
Classification: H02P

Abstract:
1. A system exclusively for starting a wound rotor motor having a stator connected by an AC bus to a three phase AC power source comprising: a phase-angle controlled silicon controlled rectifier converter configured to have at least four silicon controlled rectifiers connected in at least two anti-parallel arrangements, each having an input and an output, the input of which is connected to the rotor of the motor; a voltage source inverter configured as an IGBT-based power supply having an input and an output, the input of which is connected to the output of said converter; a voltage source converter configured as at least two separate IGBT-based DC/AC power supplies connected in parallel, having an input and an output, the input of which is connected by a bidirectional constant voltage DC bus to the output of said inverter and the output of which is connected to the AC bus.