Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-05-05
1996-03-12
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
363 41, 318807, H02D 0528
Patent
active
054989477
ABSTRACT:
A waveform synthesizer includes a data memory, an address manager, an interface and a pulse generator. The data memory has a pulse-width value storage for storing values obtained from sampling a low frequency periodic waveform at a high sampling rate. These values stored in the storage can be scaled in response to a requested magnitude by a scaler within the data memory, thereby generating a look-up table with a series of addresses. The address manager includes an address generator and an address incrementer. The address generator generates address codes for accessing the look-up table through the series of addresses. The address incrementer then adjusts the magnitude of the address increments in response to requested frequency input from the interface. The address increments are proportional to the frequency so that when the requested frequency is high, the address increments are large and more addresses are skipped over between retrieve operations. The pulse generator is provided to convert the retrieved values into pulse trains. The typical application of the waveform synthesizer is to drive an AC motor.
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Jeff Baum and Ken Berringer, "The right .mu.P simplifies using induction motors to propel electric cars", EDN, Mar. 31, 1994, pp. 48-54.
Lee Timothy S. T.
Wang John Z.
Wong Bairu L.
Cabeca John W.
FORTIS CO.
Yu Samson
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