Electricity: motive power systems – Induction motor systems – Power-factor control
Patent
1988-06-02
1989-08-01
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Power-factor control
318798, 361 30, 68 12R, H02P 540
Patent
active
048536059
ABSTRACT:
A load state detecting apparatus of an induction motor having two coils, the apparatus having a drive voltage supplying unit for supplying a drive voltage to the coils in the induction motor, a phase difference detecting unit for detecting a phase difference between the drive voltage supplied across the coils of the induction motor and a current flowing through one of the coils upon application of the drive voltage and for generating a phase difference signal, and a load state detecting unit for comparing the phase difference signal generated by the phase difference detecting unit with a predetermined reference value and generating a signal depending on a load state of the induction motor.
REFERENCES:
patent: 3600657 (1971-08-01), Pfaff
patent: 4117408 (1978-09-01), Comstedt
patent: 4150303 (1979-04-01), Armstrong
patent: 4194145 (1980-03-01), Ritter
patent: 4266177 (1981-05-01), Nola
patent: 4280038 (1981-07-01), Havas et al.
patent: 4335592 (1982-06-01), Torita
patent: 4388578 (1983-06-01), Green et al.
patent: 4481786 (1984-11-01), Bashark
Azuma Yoshiyuki
Matsuo Katsuharu
Kabushiki Kaisha Toshiba
Smith Jr. David
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