Single phase to three phase converter capable of variable speed

Details Single phase to three phase converter capable of variable speed Single phase to three phase converter capable of variable speed

1993-08-26

1995-03-28

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318778, 318785, 318801, 363 49, H02M 5293

Patent

active

054020530

ABSTRACT:
A converter, for providing three phase power to a three phase induction motor from a single phase supply, includes an inverter connected to the single phase input power lines which has two switching devices, and a bi-directional switch connected between one of the single phase input power and one output line to the motor. The other two outputs provided to the motor are a direct connection from the other AC input line and the output of the inverter. In a first or start-up mode of operation, the bi-directional switch and the inverter are controlled to provide currents to the motor which are at a fundamental frequency lower than the single phase AC input frequency to provide controlled start-up of the motor with limited in-rush current. After the motor has started, the converter may be switched to a second mode wherein the bi-directional switch is turned off and the inverter provides single phase power at increasing frequency to the motor to drive the motor up in speed. In a third mode, where the motor is at or near its rated speed, the hi-directional switch and the inverter may be operated to provide power at the rated frequency to the motor, but at variable and controllable voltage levels to control the speed of the motor. In a fourth mode, at or near the rated speed of the motor, the bi-directional switch is controlled to conduct constantly, and the inverter is operated to provide balanced three phase voltages to the motor. The converter may be implemented with only two switching devices in the inverter and one additional bi-directional switch.

REFERENCES:
patent: 3522502 (1970-08-01), Tuchen
patent: 3527995 (1970-09-01), Lee et al.
patent: 4060754 (1977-11-01), Kirtley, Jr. et al.
patent: 4618809 (1986-10-01), Maeda
patent: 4642544 (1987-02-01), Lewus
patent: 4719550 (1988-01-01), Powell et al.
patent: 4899268 (1990-02-01), Hollinger
patent: 4910450 (1990-03-01), Parker et al.
patent: 5017800 (1991-05-01), Divan
patent: 5272616 (1993-12-01), Divan et al.
C. Chen, et al., "A single Phase to Three Phase Power Converter For Motor Drive Applications," IEEE IAS Conf. Record, 1992, pp. 639-646.
S. B. Dewan, et al., "Steady-State Analysis of Static Single-Phase to Three-Phase Converters," IEEE IAS Conf. Rec., 1981, pp. 910-915.
S. K. Biswas, "A New Static Converter For The Operation of Three-Phase Motors on Single-Phase Supply," IEEE IAS Conf. Rec., 1986, pp. 1550-1554.
S. I. Khan, et al., "A Novel Single to Three Phase Static Converter," IEEE IAS Conf. Rec., 1987, pp. 658-665.
L. H. Soderholm, et al., "Automatic Balance of Three-Phase Motor Currents for Variable Motor Loading Using a Static Phase Converter," IEEE Trans. on Industry Applications, vol. 26, No. 4, Jul./Aug. 1990, pp. 679-682.
C. Chen, et al., "Simple Topologies For Single Phase AC Line Conditioning," Conference Record, IEEE-IAS Annual Meeting, Oct. 1991, pp. 911-917.
P. Enjeti, et al., "A Low Cost Single Phase to Three Phase Static Power Converter," to be published at IEEE Rural Electronics Conference, May 1992.
Colin Schauder, "Adaptive Speed Identification For Vector Control of Induction Motors Without Rotational Transducers," IEEE IAS Conf. Rec. 1989, pp. 493-499.
P. Enjeti, et al., "Economic Single Phase To Three Phase Converter Topologies For Fixed Frequency Output," IEEE APEC Conf. Rec. 1991, pp. 88-94.
J. Nesbitt, et al., "A Novel Single Phase To Three Phase Converter," IEEE APEC Conf. Rec. 1991, pp. 95-99.

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