Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
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
Hitachi , Ltd.
Smith Jr. David
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