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| Number | Title | Issue Date |
| 7355307 | Rotary transformer for supplying electric power to a superconducting rotor A device for supplying electric energy to at least one superconductor, with the superconductor being cooled in a cooled region to at least one predetermined temperature for achieving superconductivity, includes at least one electric energy source, and a transformer ... | 04/08/2008 |
| 7276876 | Synchronous motor driving apparatus A synchronous motor driving apparatus having a power converter which applies AC variable voltages having variable frequency to a synchronous motor includes a pulsating current application unit for applying pulsating current to the synchronous motor and a magnetic po... | 10/02/2007 |
| 7242160 | Starting method for Hall-less single-phase BLDCM The methods for starting a Hall-less single-phase BLDCM having an asymmetrical air gap are proposed. The provided methods are employed to input a specific amount of current impulse and stop the current impulse at a specific time such that the rotor of the single-pha... | 07/10/2007 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 6930457 | DC motor brush filter circuit The present invention provides a motor control circuit including a motor with a motor winding and a brush, a battery, a relay, and a ground return circuit. The battery is for energizing the motor. The relay selectively provides connection between the battery and the... | 08/16/2005 |
| 6741059 | Controller for a wound rotor slip ring induction machine The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is used to cont... | 05/25/2004 |
| 6617737 | Apparatus and method of powering light source An apparatus and method of powering a light source are provided. The apparatus includes a motor, a voltage stabilizing circuit, and a light source. The motor includes a field assembly and an armature assembly. The field assembly includes an intermediate t... | 09/09/2003 |
| 6448735 | Controller for a wound rotor slip ring induction machine The direct torque control (DTC) principle is used to control the torque of a wound ring rotor slip induction machine, also known as a doubly fed or cascade machine, by utilizing a solid state inverter on the rotor side. In addition, the DTC principle is u... | 09/10/2002 |
| 6362588 | Excitation system for rotating synchronous machines A system for providing DC current to a rotating superconducting winding is provided. The system receives current feedback from the superconducting winding and determines an error signal based on the current feedback and a reference signal. The system dete... | 03/26/2002 |
| 5869942 | Noise suppression in relay-switched motors Noise suppression system for a relay-switched windshield wiper, wherein reversal of current to a motor driving the wiper causes the motor to reverse. Filters contained within the motor, together with filters and shielding located external to the motor, su... | 02/09/1999 |
| 5793175 | Performance event sensing for control of electric motor driven golf car A system is provided for controlling a D-C motor which is constructed to propel a golf car. The motor is controlled to provide performance according to a predetermined field current map which calls for a particular performance response to specified perfor... | 08/11/1998 |
| 5642023 | Method and apparatus for the electronic control of electric motor driven golf car A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse ... | 06/24/1997 |
| 5451856 | Device for the transmission of electrical power signals to a rotary assembly A device for the transmission of electrical power signals of variable frequencies and phases from a stationary assembly to a rotary assembly wherein the primary winding of a rotary transformer is supplied by an electrical power source of fixed frequency, ... | 09/19/1995 |
| 5412298 | Motor control circuit having series or compound excitation during starting and shunt excitation during normal running A motor control circuit provides series or compound excitation during starting and shunt excitation during normal running. A switch responsive to the motor speed, the armature current, the armature EMF, or the like, includes terminals connected to the ser... | 05/02/1995 |
| 4048550 | Flux corrective control apparatus for motor drives A direct current motor control apparatus includes corrective circuit for eliminating the influence of non-linearities on speed regulation as a result of load variations. A summer circuit at the input of the speed regulator algebraically combines signals r... | 09/13/1977 |
