Multispeed alternating current motor
AssigneeQM Power, Inc.
InventorsCharles J. Flynn, Cooper N. Tracy, W. Scott Hunter, Stephen B. Nichols
Life of this patent
Estimating the term…
Abstract
A method is for a machine having an alternating current (AC) power source with a first side (L1) and a second side (L2), two or more pairs of power switches, and one or more windings. The method comprises closing one pair of power switches by a control circuit to cause current to flow from a first side of the AC power source, through the one or more windings, and to the second side of the AC power source and closing another pair of power switches by the control circuit to cause current to flow from the second side of the AC power source, through the one or more windings, and to the first side of the AC power source.
Claims30
A method for a machine having an alternating current (AC) power source with a first side (L1) and a second side (L2), the method comprising:
- at a motor controller for a circuit comprising a winding with a start side and an end side, a first power switch connected between the first side and the winding start side, a second power switch connected between the first side and the winding end side, a third power switch connected between the second side and the winding start side, and a fourth power switch connected between the second side and the winding end side:
- receiving a signal from an AC polarity detector and another signal from a Hall effect device and determining which of the power switches to open or close to obtain a proper direction of current flow through the winding based on the signal and the other signal;
- and
- closing the first power switch and the fourth power switch and opening the second power switch and the third power switch to cause current to flow from the first side to the second side;
- or
- closing the second power switch and the third power switch and opening the first power switch and the fourth power switch to cause current to flow from the second side to the first side.
A method for a machine having an alternating current (AC) power source having a first side (L1) and a second side (L2), the method comprising:
- at a control circuit for a circuit comprising a first winding with a first start side and a first end side, a second winding with a second start side and a second end side and with the second winding start side connected to the first winding end side, a first power switch connected between the AC power source first side and the first winding start side, a second power switch connected between the AC power source first side and the first winding end side, a third power switch connected between the AC power source first side and the second winding end side, a fourth power switch connected between the AC power source second side and the first winding start side, a fifth power switch connected between the AC power source second side and the first winding end side, and a sixth power switch connected between the AC power source second side and the second winding end side:
- closing the first power switch and the sixth power switch and opening the second power switch, the third power switch, the fourth power switch, and the fifth power switch to cause current to flow through the first winding and the second winding for fractional speed operation;
- closing the third power switch and the fourth power switch and opening the first power switch, the second power switch, the fifth power switch, and the sixth power switch to cause current to flow through the first winding and the second winding for fractional speed operation;
- closing the first power switch and the fifth power switch and opening the second power switch, the third power switch, the fourth power switch, and the sixth power switch to cause current to flow through the first winding for full speed operation;
- and
- closing the second power switch and the fourth power switch and opening the first power switch, the third power switch, the fifth power switch, and the sixth power switch to cause current to flow through the first winding for full speed operation.
A method for a machine having an alternating current (AC) power source having a first side (L1) and a second side (L2), two or more pairs of power switches, and one or more windings, the method comprising:
- receiving a signal from an AC polarity detector and another signal from a Hall effect device by a motor controller and determining which of the power switches to open or close by the motor controller to obtain a proper direction of current flow through the one or more windings based on the signal and the other signal;
- closing one pair of power switches by a control circuit to cause current to flow from a first side of the AC power source, through the one or more windings, to the second side of the AC power source;
- and
- closing another pair of power switches by the control circuit to cause current to flow from the second side of the AC power source, through the one or more windings, to the first side of the AC power source.
Dependencies are inferred from the claim text.