Measuring and testing – Test stand – For engine
Patent
1989-12-28
1991-02-12
Ruehl, Charles A.
Measuring and testing
Test stand
For engine
318490, 324158MG, G01R 3134
Patent
active
049914294
ABSTRACT:
A torque angle and peak current detector for a three-phase synchronous motor utilizes a phase-locked loop to generate a digital stator field position signal phase locked to the stator current. The phases of digital -sine and cosine reference signals generated from the field position signal are compared with x and y stator current component signals in multiplying digital to analog converters to generate a phase error signal which is driven to zero with the reference signals in quadrature with the current component signals at phase lock. The reference signals are also multiplied by in-phase current component signals and the products are summed to generate the peak current signal. A digital rotor angle position generated by a resolver and an analog to digital converter is subtracted from the digital field position signal to generate the torque angle signal.
REFERENCES:
patent: 4099103 (1978-07-01), Seeger et al.
patent: 4229694 (1980-10-01), Wilson et al.
patent: 4348892 (1982-09-01), Emanuel
patent: 4669024 (1987-05-01), Stacey
Analog Devices, Data-Acquisition Databook 1984, vol. I, Integrated Circuits, pp. 13-29.
Smith Geoffrey M.
Stacey Eric J.
Ruehl Charles A.
Westinghouse Electric Corp.
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