Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-02-12
1984-05-08
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, 363 41, 365 45, H02P 540
Patent
active
044477864
ABSTRACT:
A waveform synthesizer for generating single or poly-phase waveforms of selected wave shape and frequency for driving AC machinery including, for example, single or poly-phase induction, synchronous or other type motors or the like, includes a plurality of controllable power-switching device pairs for selectively switching power from an oppositely poled DC source to the corresponding power utilizing circuits of the driven device. The swithching device pairs are controlled to provide switched pulses of selected widths, spacings, and repetition rates to generate the desired current waveform. The power switching device pairs are selectively switched by a control circuit that includes a microprocessor controlled memory that is divided into p addressable pages with each page including s sequentially accessible memory locations containing the switching device pairs control information necessary to synthesize the desired waveform. The microprocessor is adapted to select one of the p available pages in response to pre-stored instructions, user input information, or condition-responsive transducer outputs and, after selecting the desired page, to control a pre-settable address counter to sequentially access the s memory locations of the selected page at a selected access rate and to gate the accessed switching information to the power switching device pairs to thereby synthisize the desired waveform.
REFERENCES:
patent: 3324376 (1967-06-01), Hunt
patent: 3538420 (1970-11-01), Klein
patent: 3820003 (1974-06-01), Tappeiner et al.
patent: 4099109 (1978-07-01), Abbondanti
patent: 4201936 (1980-05-01), Roumanis
patent: 4282465 (1981-08-01), Acker et al.
patent: 4290108 (1981-09-01), Woehrle et al.
patent: 4337429 (1982-06-01), Stuart
patent: 4348734 (1982-09-01), Dougherty
Buja et al., "A Microcomputer-Based, Quasi-Continuous Output Controller for PWM Invertors", IEEE Industrial Electronics and Control Instrumentation Conference, Mar. 17-20, 1980, pp. 107-111.
Mazur, T., A ROM-Digital Approach to PWM-Type Speed Control of AC Motors, Motorola Semiconductor Product Application Note AN-733, (1974).
Bhagwat Pradeep
Saar David A.
Black & Decker Inc.
Sherer R. B.
Smith Jr. David
Weinstein H.
Yocum Charles E.
LandOfFree
Waveform synthesizer and motor controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Waveform synthesizer and motor controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Waveform synthesizer and motor controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1605402