Abstract: A field-adjustable motor control system including a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter that provides signals to control the output of the inverter in response to received input control signals and in response to field adjustment signals from a first field adjustment circuit. In certain embodiments, fail-safe circuitry is also provided.

Abstract: A method and device for driving a clothes washing machine motor at a predetermined speed is presented. The washing machine motor, which may be an AC induction motor, is powered by a DC to AC inverter that includes a DC bus. The DC bus current is measured and the inverter output frequency is adjusted in response to the DC bus current measurement. In exemplary embodiments, measuring the DC bus current includes measuring the voltage drop across a resistor coupled to the DC bus. The frequency adjustment may be calculated by multiplying the DC bus current by a compensation factor to calculate a frequency adjustment value. Alternatively, frequency adjustment values may be stored in a look-up table, and the measured DC bus current is used to index the look-up table.

Abstract: A device and method for providing three-phase pulse-width modulated sine waves includes an inverter including first, second and third legs, and first and second PWM generators, the first PWM generator is coupled to selectively provide an output to the first inverter leg or the third inverter leg, and the second PWM generator is coupled to selectively provide an output to the second inverter leg or the third inverter leg. The first PWM generator provides an output to the first inverter leg during first and second 120.degree. segments of a 360.degree. electrical cycle, and the first PWM generator provides an output to the third inverter leg during a third 120.degree. segment. The second PWM generator provides an output to the third inverter leg during the first 120.degree. segment, and the second PWM generator provides an output to the second inverter leg during the second and third 120.degree.

Abstract: A multi-speed switching device particularly suitable for providing multi-speed starts for a motor, especially a two-speed motor, is provided with a high-reliability solid state switch for controlling a phased start winding of the motor, and an inexpensive switch for accommodating a lesser number of starts at an auxiliary speed. The high-reliability switch is a triac switched off during every motor start as the motor comes up to an operating speed. The inexpensive switch is an electromechanical relay that switches between a main run winding and an auxiliary speed run winding, and which is energized by voltage appearing across the solid state switch when it is switched off.

Abstract: A brushless permanent magnet (BPM) motor has a stator mounted on a hub projecting from a base-enclosure. The base-enclosure is cup-shaped, open at an end remote from the stator hub, having a side wall and a top wall defining an interior space. A printed circuit board (PCB) is mounted above the top wall, below the stator. Electrical conductors electrically connected to a printed circuit on the printed circuit board extend through the top wall and into the interior space. The electrical conductors are mounted in a connector of the insulation displacement type. Preferably the connector is made integral with an interior surface of the base-enclosure.