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| Number | Title | Issue Date |
| 8143834 | Electronically commutated serial-parallel switching for motor windings A method and a circuit for controlling an ac machine comprises controlling a full bridge network of commutation switches which are connected between a multiphase voltage source and the phase windings to switch the phase windings between a parallel connection and a s... | 03/27/2012 |
| 7345437 | Rechargeable vacuum with reduced AC voltage A motor is disclosed that operates on either AC outlet power or DC battery power with decreased power drop when switching between AC and DC power. The AC power to the motor may be stepped down by using a clipper circuit, while the DC power supplied to the motor may ... | 03/18/2008 |
| 6979979 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 12/27/2005 |
| 6909263 | Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the p... | 06/21/2005 |
| 5596236 | Motor capable of using high or low voltage A motor comprises an armature, first and second commutators disposed at either side of the armature, first and second amateur coils wound on the armature through commutator pieces in a double winding back alpha type, and first and second stator coil group... | 01/21/1997 |
| 5418436 | Motor starting method and apparatus A method for starting and operating an electric motor such as the spindle motor of a disk drive assembly employs a segmented stator winding. On startup, the winding segments are connected in series in order to maximize torque. Motor speed is detected, and... | 05/23/1995 |
| 4639647 | Four quadrant control of series motors A method of controlling and a controller for controlling at least one series motor is provided. Rectifier means is connected in series with the motor so that current through a field winding of the motor is always in the same direction irrespective of the ... | 01/27/1987 |
| 4142135 | Fork lift truck with balance weight using batteries as power source A speed control device for use in a battery-powered vehicle wherein a shunt field current in a compound electric motor for driving the vehicle having a reactor connected in series therewith can be selectively controlled by using a variable resistor includ... | 02/27/1979 |
| 4030010 | Time delay control circuit A flip-flop is arranged to be set by a first comparator and reset by a second comparitor. A first capacitor and a first resistor are connected between the input terminals of the circuit with the first comparator connected across the first resistor and the... | 06/14/1977 |
| 3938013 | D. C. Motor control system effecting changes in the connections of the armature and variations in current flow through the field A d.c. motor control system includes a pair of armature windings mounted on a single rotor or on a pair of mechanically coupled rotors, and a field winding or windings. The system includes switch means operable to effect a change in the electrical connect... | 02/10/1976 |
