AC motor drive method and system using a pulse width modulated i

Details AC motor drive method and system using a pulse width modulated i AC motor drive method and system using a pulse width modulated i

1986-10-08

1988-08-09

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 318803, 363 41, H02P 528

Patent

active

047630604

ABSTRACT:
An induction motor is driven from an inverter having switches activated in prescribed on off patterns to provide a series of voltage vectors for creating a revolving field vector in the motor, and a zero vector for arresting the rotation of the field vector. Memories are provided on which are written voltage vector data and zero vector data. A readout control circuit reads out the voltage vector data and zero vector data from the memories with preassigned constant cycles in order to cause the inverter to generate in real time the corresponding voltage vectors and zero vectors needed for motor speed control. Each cycle consists of a first variable length segment during which the voltage vector data are read out to cause the inverter to generate the voltage vectors in a predetermined sequence and at predetermined time intervals, and a second variable length segment during which the zero vector data are read out. The readout control circuit controls the motor speed by controllably varying the relative lengths of the two segments of the successive cycles, with the second segment of each cycle made shorter for a higher motor speed and longer for a lower motor speed.

REFERENCES:
patent: 4356544 (1982-10-01), Ono et al.
patent: 4357655 (1982-11-01), Beck
patent: 4477763 (1984-10-01), Asano et al.
patent: 4575667 (1986-03-01), Kurakake
patent: 4656572 (1987-04-01), Caputo et al.
Tung Hai Chin, Motomu Nakana, Yutaka Fuwa, New PWM Technique Using a Triangular Carrier Wave of Saturable Amplitude, May/Jun. 1984, IEEE Transactions on Industry Applications, vol. IA-20, No. 3, pp. 643-650.

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