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| Number | Title | Issue Date |
| 7321208 | Driving apparatus A driving apparatus for driving a functional body mounted on a vehicle comprises a power supply, an electric motor, and a driving means. The electric motor is connected to the power supply and is started by a power feed from the power supply. The driving means has a... | 01/22/2008 |
| 7211971 | Linear actuator A linear actuator having a housing, a plunger slidably mounted to the housing between an extended and retracted position, and an electric motor drivingly connected to the plunger to move the plunger between its extended and retracted positions. A motor circuit contr... | 05/01/2007 |
| 6979965 | Spring return actuator for a damper An actuator including an electric motor driven by a drive circuit powered by a power source, and a load coupled to the electric motor. The actuator further includes a spring biasing the load to a first position, and a microcontroller coupled to the electric motor to... | 12/27/2005 |
| 6940241 | Circuit using current limiting to reduce power consumption of actuator with DC brush motor A drive circuit including a motor for positioning a damper from a rest position to a stalled position and protect the drive mechanism from damage due to increased current to the drive motor when the damper stalls by including a current limiter to prevent the current... | 09/06/2005 |
| 6157159 | Stage system and exposure apparatus using the same A stage system includes a stage movable along a path, a first driving mechanism for accelerating or decelerating the stage on the basis of a resilience force of a resilient member, a first holding mechanism for holding a resilience force being accumulated... | 12/05/2000 |
| 6100655 | Mechanical return fail-safe actuator for damper, valve, elevator or other positioning device The electrically powered actuator includes a capacitor for supplying supplemental electrical power to a motor in response to a loss of power to the motor from a main power source in order to enable the motor to overcome the magnetic resistance of the moto... | 08/08/2000 |
| 5872434 | Systems and methods for actuator power failure response A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals su... | 02/16/1999 |
| 5182498 | Spring return rotary actuator A rotary actuator uses a two degree of freedom gear train with three torque members to provide torque to the output element from a first torque member. The torque is supplied to a second torque member from a drive motor. A torsion spring on the third torq... | 01/26/1993 |
| 4705996 | Apparatus for positioning a rotating element The position of a rotating element is controlled by a galvanometer and a servo system. The position of the rotating element is determined by using a two-grating moire pattern. Movement of the element causes a projected scale image representing radiation r... | 11/10/1987 |
| 4680514 | Motor The present invention relates to a motor for driving a clockwork. A rotatably supported rotor 1 has diametrically opposite permanent-magnet poles. A multi-phase coil arrangement is furthermore present to produce a magnetic field which deflects the rotor 1... | 07/14/1987 |
| 4677355 | Electric-powered spring-return actuating device Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical ... | 06/30/1987 |
| 4613798 | Electric-powered spring-return actuating device Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical ... | 09/23/1986 |
| 4462539 | Air conditioning economizer control method and apparatus An air conditioning economizer control method and apparatus for integrating the operation of the economizer with an air conditioning system is disclosed. An economizer position control arrangement is further disclosed incorporating a rotor locking circuit... | 07/31/1984 |
| 4371834 | Device for measuring the frequency of an electrical current representative of a variable quantity A device to make a measurement of a variable quantity such as the speed of rotation of a first shaft or the speed of operation of an ignition system of an engine, wherein electrical pulses are produced at a frequency which is a function of the speed. The ... | 02/01/1983 |
| 4265394 | Flue damper control system In a flue damper control system, a thermistor 64 responsive to flue temperatures upstream of the damper 12 is incorporated in a trigger circuit for a triac 52 which controls energization and deenergization of the damper motor 17, the damper motor being fu... | 05/05/1981 |
| 3974427 | Motor control apparatus for three position valve A motor control apparatus having an electric motor which is driven in one direction by an alternating current power source and in a return direction by a spring return wherein a holding or braking of the motor is accomplished by the application of a sourc... | 08/10/1976 |
