Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1992-11-12
1994-05-31
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318801, 318802, H02P 528
Patent
active
053172485
ABSTRACT:
A multi-processor AC motor control system having a timer processor which generates multiple synchronized PWM waveforms while minimizing software latency effects. The timer processor generates a 50% PWM duty cycle sync signal at the PWM frequency, creating a logic level transition (leading edge) in each PWM period. At each such transition, the timer processor interrupts the host processor for the purpose of updating a multi-byte timer data register with PWM on-time data stored in nonvolatile memory as a function of machine position and requested current. A separate timer channel is provided for each PWM waveform to be generated, and the timer processor sets off-to-on and on-to-off transitions of each waveform in accordance with the updated PWM on-time data such that respective off-to-on and on-to-off transitions in each waveform are centered about the leading edges of the sync signal. If the on-time is 0% or 100%, the timer processor overrides the normal instruction set and forces the logic state of the waveforms to a full-off or full-on logic state.
REFERENCES:
patent: 4489267 (1984-12-01), Saar et al.
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patent: 4615000 (1986-09-01), Fuji et al.
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patent: 4802077 (1989-01-01), Fuji et al.
Automotive Design Engineering, "Sine Wave Generation for Electric Vehicle AC Motor Drive", by Jeff Baum & Ken Berringer, pp. 326-330, 1992.
Cheever, Jr. Gordon D.
Deasy Kevin M.
Utley Daniel E.
Delco Electronics Corp.
General Motors Corporation
Masih Karen
Navarre Mark A.
Shoop Jr. William M.
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