Electricity: motor control systems inventions 05/08

20080124059 - Constant voltage power supply circuit, constant voltage supplying method, and portable constant voltage power supply device, electric reel, fishing rod supporting tool, and fishing rod holding device that use the same constant voltage power supply circuit: A constant voltage power supply circuit includes oscillation means; a step-up or step-down circuit including coil means and capacitive means; detecting means that detects an outputted voltage value of the step-up or step-down circuit, and compares the detected value with a predetermined reference value to output a detected information, at... Agent: Greer, Burns & Crain

20080118234 - Surgical machine and method for controlling and/or regulating a surgical machine: To improve a surgical machine with a sensorless electric motor comprising a rotor and at least two motor windings, and with a motor controller for controlling and/or regulating the electric motor, so that the electric motor is operable with optimum efficiency at low rotational speeds and a starting of the... Agent: Lipsitz & Mcallister, Llc

20080118235 - Actuator with dc motor and with irreversible transmission for maneuvering a roller blind: the mechanical transmission device (TRD) comprises a transmission element (BRK) such that, during the maneuvering phases of the movable element (LD), the supply current to the motor (MOT) is always non zero and always flows in the direction defined by the “motor” operation of the motor (MOT).... Agent: Ronald R. Santucci Frommer Lawrence & Haug LLP

20080112694 - Electric motor speed controller for vehicle: An electric motor speed controller for use in a bicycle includes a motor to provide a propulsion force to move the bicycle. The actual motor speed and a target motor speed are compared, and if the actual motor speed is lower, more current is supplied to the motor, and if... Agent: Greenblum & Bernstein, P.L.C

20080112695 - Motor drive apparatus and method: If a PWM duty instruction D1 determined by a duty calculation circuit exceeds an upper limit value, a duty signal processing circuit in a motor drive apparatus divides a switching current supply period in each of the phases into a first current supply period and a second current supply period.... Agent: Posz Law Group, Plc

20080112696 - Methods and apparatus to lock a phase lock loop to a motor: Methods and apparatus to lock a phase lock loop to a spindle motor are disclosed. An example controller comprises a counter to determine a period of an operating signal received from a motor, an oscillator to generate a control signal based on an input signal, and an initializer to generate... Agent: Texas Instruments Incorporated

20080112697 - Control apparatus using speed estimation for dc motor in image forming apparatus and method thereof: A control apparatus for an image forming apparatus to control a DC motor at low speed using a low resolution encoder and a method thereof. If the encoder does not generate any pulses during a controlling period, the control apparatus estimates the speed of the DC motor using a formula... Agent: Stein, Mcewen & Bui, LLP

20080107407 - Brushless dc motor driver circuit capable of reducing vibration or shock noise and method thereof: The present invention discloses a brushless dc motor driver circuit capable of reducing vibration or shock noise and a method thereof. The brushless dc motor driver circuit of the present invention comprises a Time-Voltage Digital/Analog Converter. The Time-Voltage Digital/Analog Converter further comprises: at least one magnetic field detecting circuit, at... Agent: Sinorica, Llc

20080107408 - Motor driving apparatus: In a motor driving apparatus, a control unit detects a rotation frequency of a motor to be driven and generates a control voltage Vcnt in a manner such that the rotation frequency thereof is brought close to a desired rotation frequency. A clamping circuit sets an upper limit Vcu and... Agent: Cantor Colburn, LLP

20080101775 - Compensated switching power supply controller and method therefor: In one embodiment, a multi-channel power supply controller adjusts the value of an error signal to minimize overshoot and undershoot during load transients.... Agent: Jerry Chruma Semiconductor Components Industries, L.L.C.

20080101776 - Method and system for sensorless brushless dc motor control with predictive switch timing: A method and system for providing sensorless brushless DC motor control using predictive switch timing requires connecting a stator coil in a bridge configuration, applying a positive excitation voltage across the coil for a predetermined time period, deactivating the excitation voltage, and monitoring the voltage (VEMF) generated due to electro-motive... Agent: Koppel, Patrick & Heybl

20080101777 - Method and circuitry arrangement for operating a brushless electric motor: In a method of operating a brushless electric motor, having a permanent magnet rotor and a stator with three windings electrically offset by 120°, provided for example for driving a dental treatment instrument, the zero crossings of a voltage induced by rotation of the rotor in the stator windings is... Agent: Marshall, Gerstein & Borun LLP

20080101778 - Pulse-width-modulation motor drive circuit having potential limiter: A PWM motor drive circuit includes a drive IC member, a PWM converter circuit and a potential limiter. The drive IC member electrically connects with a motor coil and further includes a pin electrically connected with the PWM converter circuit. The potential limiter has a first terminal electrically connected with... Agent: Birch Stewart Kolasch & Birch