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| Number | Title | Issue Date |
| 7315102 | Axial gap motor An axial gap motor is described which comprises a rotor shaft rotatable about its axis in case. A rotor is fixed to the rotor shaft to rotate therewith. The rotor includes a plurality of magnets. A stator is disposed about the rotor shaft at a position to coaxially ... | 01/01/2008 |
| 7312554 | Piezoelectric devices and methods and circuits for driving same A drive circuit (18) senses a parameter of a piezoelectric actuator (14) operating in a device (10) and adjusts a drive signal of the piezoelectric actuator in accordance with the parameter. The drive circuit comprises a controller (100) ... | 12/25/2007 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7304397 | Fuel cell system A fuel cell based system for the generation of electrical energy employs a drive unit that includes at least two electric motors sharing a common rotor which is mechanically coupled to drive a compressor to provide oxidant and/or fuel to a fuel cell. An electrical s... | 12/04/2007 |
| 7290993 | Piezoelectric devices and methods and circuits for driving same A drive circuit (18) produces a drive signal having a waveform of a predetermined waveform shape for a device (10) having a piezoelectric actuator (14). The drive circuit (14) includes a memory (140) which stores waveform shape dat... | 11/06/2007 |
| 7287965 | Piezoelectric devices and methods and circuits for driving same A drive circuit (18) produces a drive signal for a pump (10) having a piezoelectric actuator (14), with the piezoelectric actuator (14) forming a part of the drive circuit (18) and serving to shape a waveform of the drive signal. T... | 10/30/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7270203 | Electric machine for hybrid motor vehicle A power system for a motor vehicle having an internal combustion engine and an electric machine is disclosed. The electric machine has a stator, a permanent magnet rotor, an uncluttered rotor spaced from the permanent magnet rotor, and at least one secondary core as... | 09/18/2007 |
| 7267043 | Actuators with diaphragm and methods of operating same Actuator assemblies comprise an actuator element and two piezoelectric assemblies, with the two piezoelectric assemblies being configured and arranged for controlling movement of the actuator element. In some example implementations, the first piezoelectric assembly... | 09/11/2007 |
| 7227273 | High frequency bus method Certain exemplary embodiments can include a system comprising an electric drive system for a machine. The system can include a rectifier adapted to convert AC power from an alternator to DC power. The system can include an inverter adapted to receive DC power from t... | 06/05/2007 |
| 7129618 | Control apparatus capable of low-speed driving of vibration type driving apparatus, actuating apparatus using the control apparatus, control method capable of low-speed driving of vibration type driving apparatus, and storage medium storing program including program codes capable of realizing the control method A control apparatus and a control method for a vibration type driving apparatus are disclosed which can maintain output performance even when low-speed driving is continued for a long time. The vibration type driving apparatus comprises a vibrating body and an elect... | 10/31/2006 |
| 7126313 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 10/24/2006 |
| 7119461 | Enhanced thermal conductivity ferrite stator A permanent magnet electric machine (i.e.: motor/generator) having a magnetic flux circuit including a stator and a permanent magnet rotor mounted for rotation about an axis relative to the stator. The stator has an electric circuit with windings electro-magneticall... | 10/10/2006 |
| 7098552 | Wind energy conversion system A wind energy conversion system includes upper and lower wind turbines having counter-rotating blade assemblies supported for rotation about a vertical rotation axis, with each blade assembly carrying a rotor for rotation past a stator to produce an electrical outpu... | 08/29/2006 |
| 7078840 | Brushless rotary electric machine having tandem rotary cores A brushless rotary electric machine includes a stator having an annular armature core with first radial teeth at the outer periphery thereof and second radial teeth at the inner periphery thereof and an armature winding wound between the teeth, a rotor having a pair... | 07/18/2006 |
| 7071581 | Uninterruptible power supply system using a slip-ring, wound-rotor-type induction machine and a method for flywheel energy storage Several embodiments of an uninterruptible power supply (UPS) system, which system provides highly reliable output power to a load using a slip-ring induction machine and a flywheel combination, are disclosed as well as methods relating thereto. In a preferred embodi... | 07/04/2006 |
| 7061156 | Control apparatus for vibration type actuator The present invention relates to apparatus achieving improvement in operation characteristics in the operation of stopping or reversing the direction of or decelerating movement of a vibrating wave actuator constructed to apply an alternating voltage to an electro-m... | 06/13/2006 |
| 7002317 | Matched reactance machine power-generation system A system and method is described for using a matched reactance machine power generation system (MRMPGS) to provide a constant-voltage power for an electric distribution system. The system and method include a permanent magnet rotor type machine without a field windi... | 02/21/2006 |
| 6979933 | Apparatus and method for charging and discharging a capacitor An apparatus for electrically stimulating a smart material includes a controllable power source for charging the smart material and/or switching circuitry for discharging the smart material. The controllable power source includes a regulated DC to DC converter havin... | 12/27/2005 |
| 6975045 | Wind power generating system In a wind power generating system, a pair of axially spaced turbines are connected to an outer rotor and an inner rotor of a generator, respectively, and are provided with blades having equal but opposite pitch angles so that the inner and outer rotor rotate at a sa... | 12/13/2005 |
| 6965183 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 11/15/2005 |
| 6954022 | Control apparatus for vibration type actuator Provided is a control device for a vibration type actuator having an elastic member fixed with an electro-mechanical energy conversion element, and a vibration member that generates a vibration on a surface of the elastic member by supplying a drive signal to the el... | 10/11/2005 |
| 6946766 | Permanent magnet machine An interior permanent magnet machine including a rotor stack defining at least two adjacent magnet retention slots and a plurality of permanent magnets positioned within the interior of the rotor, wherein the radial thickness of the rotor that is above a given magne... | 09/20/2005 |
| 6940251 | Decoupling of cross coupling for floating reference frame controllers for sensorless control of synchronous machines A synchronous motor controller and method of controlling a synchronous motor without using rotor position sensors are provided. In a floating synchronous reference frame controller, phase currents are measured and a current Park vector is determined. The error betwe... | 09/06/2005 |
| 6635977 | Control apparatus for vibration wave actuator This invention relates to an arrangement for detecting the driven state of a vibration wave actuator apparatus and provides an apparatus in which a waveform signal having an amplitude corresponding to a vibration state is generated by a monitor circuit, a... | 10/21/2003 |
| 6297575 | Combined power driven device having a three-layered electromechanical structure with common structures A combined power driven device is made up of three layers, each of the three layers forming an electromechanical structure such as a stator or an armature. One of the three layers serves as a common magnetic structure for interaction with the electromecha... | 10/02/2001 |
| 6137200 | Compliant motor rotor retainer A disk drive has a sleeve-bearing spindle motor having a rotor for rotating the disk of removable data storage cartridge. A retainer which is compliant in the direction of axial movement of the rotor stops the axial movement. The retainer is mounted on a ... | 10/24/2000 |
| 5804902 | Multi-phase electric machine with joined conductor lanes In prior art multi-phase electric machines in which conductor parts are interlace to form conductor lanes for various phases, the connection points are on the winding end, thus permitting only a very limited local possibility for welding of the conductor ... | 09/08/1998 |
| 5780955 | Ultrasonic motor device An ultrasonic motor device comprises a vibrating member, a moving member movably disposed on the vibrating member and driven by vibration of the vibrating member, and a pressure regulating member for urging the moving member into pressure contact with the... | 07/14/1998 |
| 5749432 | Power steering gear for motor vehicle A motor vehicle power steering gear has a proportional control valve with first and second valve members connected by a torsion spring and defining a center position with zero torque in the torsion spring. Electromagnetic apparatus for varying the magnitu... | 05/12/1998 |
| 5684348 | Automatic damping and transient supressing improvement in synchronous motors and generators A synchronous motor/generator is modified by mounting the conventional rotor on a sleeve that rotates freely on the main shaft rather than being fixedly mounted on the shaft. Limits to this rotation are incorporated in the design such that the maximum ang... | 11/04/1997 |
| 5454439 | Power steering gear for motor vehicle A motor vehicle power steering gear having a proportional control valve and an electromagnetic apparatus for varying the effective restoring torque of a torsion bar of the proportional control valve. The electromagnetic apparatus includes a cylindrical ri... | 10/03/1995 |
| 5434454 | Transient-free synchronous electrical power machine Proximity switches and circumferentially movable stator windings allow a motor-generator to simultaneously sense and switch from a synchronous motor position to a synchronous generator position. This mechanism replaces the conventional separate sensing an... | 07/18/1995 |
| 5311062 | Transient-free synchronous electrical power machine Proximity switches and circumferentially movable stator windings allow a motor-generator to simultaneously sense and switch from a synchronous motor position to a synchronous generator position. This mechanism replaces the conventional separate sensing an... | 05/10/1994 |
| 5274291 | Rotary transformer with multiple angularly adjustable stators A rotary transformer having a rotor assembly mounted on a shaft and a plurality of associated cooperative stators rotatably mounted about the rotor assembly. The stators are angularly adjustable, relative to each other, about the axis of the shaft. Electr... | 12/28/1993 |
| 5245238 | Axial gap dual permanent magnet generator A permanent magnet generator having a plurality of permanent magnet generator units which produce a controlled output potential by mutual magnetic flux linkage between the permanent magnet generator units to produce the controlled output potential in acco... | 09/14/1993 |
| 5134348 | Vibration wave motor A vibration wave motor in which a signal for suppressing unnecessary vibration engendered during the driving of the vibration wave motor, besides the driving signal of the motor, is applied to the motor to suppress the unnecessary vibration.... | 07/28/1992 |
| 5126605 | Oscillating stepper motor In a preferred embodiment, an oscillating stepping motor having only one stator phase. What would otherwise be a second stator phase is a magnet fixedly disposed with respect to the rotor to produce a detent position of the rotor. When the stator is energ... | 06/30/1992 |
| 5089734 | Dual rotary ac generator A generator includes a rotatable housing carrying permanent magnets for creating a magnetic field, an armature carrying electrical coils and a gear set for simultaneously rotating the housing and magnetic-field-creating permanent magnets in a direction op... | 02/18/1992 |
| 5038064 | Limited angle rotary actuator A limited angle torque actuator produces a substantially constant torque over an excursion angle of 90 degrees or more. The actuator uses a core made from a highly permeable magnetic material such as soft iron. In a preferred embodiment, one or more perma... | 08/06/1991 |
