Variable-speed drive for single-phase motors

Details Variable-speed drive for single-phase motors Variable-speed drive for single-phase motors

1999-05-10

2000-09-19

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318751, 318785, H02P 528

Patent

active

061217492

ABSTRACT:
A single-phase variable-frequency power supply with two output voltages drives a single-phase AC motor that has a start circuit and main winding. For permanent split-capacitor motors, the power supply maintains a constant voltage to the start winding while it reduces the voltage to the main winding at lower frequencies. The power supply can similarly control the speed of capacitor-start and split-phase motors. For fans and pumps and other variable-torque applications, the power supply maintains approximately a constant ratio of main-winding voltage to the square of frequency. The power supply is preferably an electronic pulse-width modulated inverter.

REFERENCES:
patent: 3624470 (1971-11-01), Johnson
patent: 4651079 (1987-03-01), Wills
patent: 4706180 (1987-11-01), Wills
patent: 4958118 (1990-09-01), Pottebaum
patent: 5136216 (1992-08-01), Wills et al.
patent: 5146147 (1992-09-01), Wills et al.
patent: 5218283 (1993-06-01), Wills et al.
patent: 5252905 (1993-10-01), Wills et al.
patent: 5796234 (1998-08-01), Vrionis

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