Static Scherbius system

Details Static Scherbius system Static Scherbius system

1981-03-04

1982-08-10

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 57, H02M 118

Patent

active

043440266

ABSTRACT:
The secondary voltage of a wound-rotor induction motor is rectified by a multi-phase full-wave rectifier circuit of Gratz connection. An inverter connected to the full-wave rectifier circuit through a DC intermediate circuit regulates the amount of AC voltage fed back to the AC power source thereby controlling the speed of the induction motor. A smoothing reactor is disposed in one of the DC buses of the DC intermediate circuit, with its inverter-side terminal being connected to at least two of the AC-side terminal of the full-wave rectifier circuit through series circuits of a resistor and thyristors. A DC gate signal is applied to the thyristors in the series circuits upon detection of interruption of AC power supply, and application of the DC gate signal is ceased in a predetermined period of time after recovery of the AC power supply voltage. The system of simple structure can thus prevent commutation failure of the inverter even when the supply of the AC power supply voltage is interrupted momentarily.

REFERENCES:
patent: 3612971 (1971-10-01), Blaschke et al.
patent: 3800198 (1974-03-01), Graf et al.
patent: 3947748 (1976-03-01), Klein

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