Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1981-10-30
1994-08-02
Smith, David
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 540
Patent
active
053349245
ABSTRACT:
Speed control of an induction motor is effected in digital fashion through use of a computer but without complex processing, and with a computer that need not be large in scale. This is accomplished by processing at least a speed command signal, actual speed signal and torque signal in analog fashion, enabling simplification of an induction motor speed control digital processing section which performs all other control operations in a digital manner. In a speed control network having a closed loop, a frequency-to-voltage converter, adder-subtractor, proportional integrator, polarity determining circuit absolute value circuit and voltage-to-frequency converter are constructed of circuitry operable on the basis of analog values, with all other circuits being constructed of circuitry operable on the basis of digital values.
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Williams, B. W., "Microprocessor Control of DC 3-Phase Thyristor Inverter Circuits", IEE Transaction Indust'l, Elec & Control, vol. IECI-27-No. 3 Aug. 1980 pp. 223-238.
Sen et al, "Induction Motor Drives with Microcomputer Control Systems," Conference IAS Annual Meeting, 1980, Cincinnati, Ohio Sep. 28-Oct. 3, 1980.
Polk, D. R., "Algorithm for Implementating PID Control for Servo Systems on Microprocessor", IBM Tech Bull vol. 23, No. 8 p. 3514 (Jan. 1981).
Ishida Hiroshi
Kawada Shigeki
Fanuc Ltd.
Smith David
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