Variable speed AC motor control system

Details Variable speed AC motor control system Variable speed AC motor control system

1983-02-04

1986-10-21

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318807, H02P 540

Patent

active

046188100

ABSTRACT:
AC mains voltage input is directed to a bridge rectifier and converted to a DC voltage output. This DC power supplies an inverter which reconverts it to variable frequency AC output, used to drive a variable-speed AC motor.
A microprocessor-based control unit generates firing pulses for SCR's in both the rectifier and inverter. It maximizes the efficiency of the rectifier by generating phase delay and sequencing data in advance of each line-to-netural zero-crossover of the AC mains voltage input; it makes the voltage and frequency of the inverter AC output both proportional to the value of the DC voltage output, enabling the system to maintain a constant volts/Hertz ratio between the AC output voltage and the AC output frequency.
Appropriate fault protection circuits are included with the control unit to prevent fault conditions from damaging the system.

REFERENCES:
patent: 3437911 (1969-04-01), Gutzwiller
patent: 3497796 (1970-02-01), Konrad
patent: 3750004 (1973-07-01), Wacker
patent: 4201936 (1980-05-01), Roumanis
patent: 4267570 (1981-05-01), Braun
patent: 4325099 (1982-04-01), Morehouse
Sen et al. "Induction Motor Drives with Microcomputer Control System", IAS Annual Meeting, 1980, Cincinnati, OH, USA, (28 Sep.-3 Oct. 1980).
Athani et al., "Microprocessor Control of a Three-Phase Inverter in Induction Motor Speed Control System", IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IEC 1-27, No. 4, Nov. 1980, pp. 291-298.

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