Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-12-11
1987-04-21
Beha, Jr., William H.
Electricity: motive power systems
Induction motor systems
Primary circuit control
323910, 361 77, H02P 736
Patent
active
046599746
ABSTRACT:
A control circuit is connected between a three-phase power supply and a motor and ensures the correct application of phase signals to the motor, regardless of the way in which the control circuit is connected to the power supply. A first output signal of the supply is connected directly to an input of the motor via the circuit. Supply of power to the other two inputs is controlled by four switches, two of which receive signals from the second supply output and have their outputs connected to respective motor inputs, and the other two of which receive signals from the third supply output and have their outputs connected to respective motor inputs. The switches are controlled such that two switches are on, and the other two switches are off if the third output signal is positive with respect to the first output signal when the second signal passes through zero with respect to the first signal in a positive sense.
REFERENCES:
patent: 3708719 (1973-01-01), Ishikawa
patent: 3848165 (1974-11-01), Heiberger
patent: 4021704 (1977-05-01), Norbeck
patent: 4163270 (1979-07-01), Marus
patent: 4196378 (1980-04-01), Shirai
patent: 4492878 (1985-01-01), Hamel
patent: 4618807 (1986-10-01), Wiessner et al.
Bax Anton M.
May Jonathan C.
Beha Jr. William H.
Smiths Industries Public Limited Company
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