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| Number | Title | Issue Date |
| 8159167 | Electronically commutated motor An electronically commutated motor (20) has a rotor (28) and a rotor position sensor (30), which sensor, during operation, furnishes a rotational position signal (34). A stator interacts with the rotor (28). The stator has a stator... | 04/17/2012 |
| 7408313 | Low power preamplifier writer architecture A circuit is adapted to activate a writer head of a data storage media drive during both the boost periods as well as the steady state periods. The current supplied to the writer head during the boost periods exceeds the steady state current and flows between positi... | 08/05/2008 |
| 7355361 | Motor control apparatus A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (51), a drive c... | 04/08/2008 |
| 7323646 | Hand and foot switch A hand operable switch includes an operating knob that is movable longitudinally or rotationally about a longitudinal axis of the hand operable switch. The operating knob is accessible from any circumferential location of the hand operable switch. A housing includes... | 01/29/2008 |
| 7276868 | Carbon-fiber laminate musical instrument sound board A soundboard for a hollow-body stringed instrument made of layers of carbon-fiber and resin material surrounding a core of one or more layers of constant-thickness plywood, veneer (thinly sliced wood) or paper. Additional shaped layers are provided to produce a desi... | 10/02/2007 |
| 7224135 | Imposed current motor drive A method for driving a motor by imposing the current in the motor by means of power current mirrors is presented. This allows driving the motor in current with higher accuracy and lower electrical noise. The Hard Disk Drive application is an example where higher res... | 05/29/2007 |
| 7215093 | Motor drive circuit and motor drive method that can positively perform a brake operation A motor drive circuit includes a first transistor. The collector of a second transistor is connected to the emitter of the first transistor in series. A motor is connected to a connection point between the first and second transistors. A first brake control circuit ... | 05/08/2007 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 7053586 | Brushless repulsion motor speed control system A system for controlling the speed of a brushless repulsion motor having a series of switches mounted on a rotating armature for shorting circumferentially spaced armature coils comprising first stationary signaling means and a plurality of rotating detectors for ac... | 05/30/2006 |
| 7038410 | Electric motor with dynamic damping A method of dynamically damping an electric motor (12) that is controlled by an H-bridge driver (16) by interdigitating power pulses with braking pulses by switching from a power switch mode to a shorting circuit mode with switches (22 and 26... | 05/02/2006 |
| 6940243 | Method for commutating an electronically commutated DC motor, and motor for carrying out said method An improved method of commutating an electronically commutated DC motor shuts off application of power between the end of one current pulse and the beginning of the subsequent current pulse. Based upon the instantaneous rotation speed, one calculates at what instant... | 09/06/2005 |
| 6909252 | Pre-drive circuit for brushless DC single-phase motor A pre-drive circuit for a brushless DC single-phase motor permits a cost reduction and an easy adjustment for the control input voltage of a switching device adjacent to a power source in a wider range, especially in increasing the control input voltage. In a drive ... | 06/21/2005 |
| 6903523 | Methods and apparatus for dynamically reconfiguring a pulse width modulation approach An apparatus includes a driver circuit including electronic switches operable to deliver voltage and current to a polyphase motor; and a control circuit operable to provide driver control signals to the driver circuit to commutate the electronic switches, the contro... | 06/07/2005 |
| 6469465 | Precision micro-motor position controller A micro-motor position controller utilizes a ratiometric position sensor that operates independent of any reference voltage sources. A first capacitor and a second capacitor in a micro-motor are connected in series and form one section of a capacitive bri... | 10/22/2002 |
| 6384556 | Motor driving circuit In order to brake a brushless motor in a forward rotation to give a reverse rotation force, source-side and sink-side transistors for supplying driving circuits *a, *b, *c, *d, *e, *f are periodically switched on and switched off based on the oscillation ... | 05/07/2002 |
| 6288507 | Motor drive circuit A motor drive circuit is comprised of an H-bridge circuit which is formed of a flywheel diode and a switching device and connected to a motor coil; a current detecting circuit which is connected to the H-bridge circuit, has a plurality of shunt resistors,... | 09/11/2001 |
| 6118242 | Travel-limit circuit having a direct current motor for a lens A travel-limit circuit having a DC motor for a lens by which the endurance of the motor can be improved while at the same reducing the rebound due to the inertia of the moving body at a travel extremity. The travel-limit circuit has a lens motor that driv... | 09/12/2000 |
| 6008619 | Motor drive apparatus and motor driving method capable of simply reducing rotating speed in PWM mode A drive current and a regenerative current are alternately applied to a motor during a PWM (pulse width modulation) time period. The regenerative current is produced by an electromagnetic induction of an armature and flows in the opposite direction as the... | 12/28/1999 |
| 5990644 | Motor drive circuit A motor drive circuit 1 is driven by a DC power source 2 connected to power source terminals Tv1, Tv2 and has a first drive transistor Q1 for controlling a drive current supplied to a first terminal Tm1 of a motor from the DC power source 2, a second driv... | 11/23/1999 |
| 5801504 | Control apparatus for electric power steering system A control apparatus for an electric power steering system assures stability of the feedback control and control generation of noise from the control circuit when the steering wheel automatically returns to the neutral position by means of the self-alignin... | 09/01/1998 |
| 5681025 | Motor operated butterfly valve with a multi-function seal A fluid valve has a housing formed by first and second halves which combine at mating surfaces to form a cavity with an inlet in the first half and an outlet in the second half. The mating surface of each half includes a notch extending between an outer e... | 10/28/1997 |
| 5574344 | Power steering apparatus for performing feedback control of motor-driving current A power steering apparatus for use in association with an electric motor, includes a switch circuit driven by a PWM wave signal which switches between one polarity and the other of the voltage developed across a motor-driving current detecting resistance ... | 11/12/1996 |
| 5459654 | Apparatus for generating positive and negative supply rails from operating motor control circuit A motor control circuit is used to generate positive and negative voltage supply rails. The motor control circuit contains two halfbridges, each of which contains a pair of MOSFETs connected in series, each of the MOSFETs being formed without the customar... | 10/17/1995 |
| 5192901 | Short circuit protection In the transistor power output stages disclosed herein, short-circuit protection is provided with respect to output terminals through which a reversible motor or other load is to be energized. An output stage connected between the load and one of the supp... | 03/09/1993 |
| 4978898 | Motor driving and malfunction detecting device A motor driving device is provided with switches connected with both terminals of a motor in an H-bridge connection and malfunction detectors connected with both terminals of said motor. The malfunction detectors are comprised of an impression part and a ... | 12/18/1990 |
| 4963802 | Resistor programmable velocity controller A logic-controlled circuit superimposes a constant voltage across an actuator or motor load that is driven by a bridge-type amplifier to control the constant velocity operation of such load in response to an applied logic signal that may also disable the ... | 10/16/1990 |
| 4910443 | Electronic control circuit for a bidirectional motor A field installable motor operator for a circuit breaker includes a bidirectionally controllable motor that is coupled through a torque limited module to a circuit breaker operating mechanism. The motor is bidirectionally driven by a transistor switching ... | 03/20/1990 |
| 4897882 | Motor control apparatus and method Motor control systems are commonly associated with motors found on electric industrial vehicles, such as lift trucks. Advantageously, the control of such motors should be optimized such that current is timely supplied to the motors in conjunction with sel... | 01/30/1990 |
| 4677356 | DC motor drive control device A DC motor is connected across the mid-points of a bridge circuit which includes a switching device in each leg of the bridge. A forward or reverse motor direction drive current flows through the motor depending on the conducting states of the switching d... | 06/30/1987 |
| 4649326 | High voltage MOS SCR and power MOSFET "H" switch circuit for a DC motor An MOS SCR and MOSFET "H" switch circuit for a DC motor is provided which allows for the use of a supply voltage of greater than 20 volts by clamping the gate-to-cathode voltage of the SCR's used therein to a predetermined value which is less than the gat... | 03/10/1987 |
| 4581565 | H-bridge power amplifier and method for controlling the same An improved H-bridge power amplifier for controllably driving a dc motor is presented. The motor is connected in the center of the H-bridge in conventional manner. The H-bridge includes a current sense resistor placed between the power supply and a common... | 04/08/1986 |
| 4568864 | Electric motor control for a pipe bender A solid-state electronic control system for an electric motor which drives a pipe bending machine. A machine operator's hand switch acts through a logic system to cause the motor to run in either direction, and negates control conflicts. The logic system ... | 02/04/1986 |
| 4562387 | Vehicle power window control A control for a vehicle window driving motor in an H-switch semiconductor bridge with an SCR and a FET in each opposite armature current path includes control logic circuitry enabling one-touch actuation of window movement in either direction with stoppag... | 12/31/1985 |
| 4514668 | D.C. Motor driving circuit A D.C. motor driving circuit comprises a first transistor circuit comprising an initial stage transistor and a terminal stage transistor respectively connected in Darlington pairs, for supplying a current to a D.C. motor, coupled between the D.C. motor an... | 04/30/1985 |
| 4490655 | Bi-directional driver system for electrical load A bi-directional driver system for an electrical load operable in response to two independent logic command signals provides a means for selecting the direction of current flow in the load when driven by the external command. A bridge circuit employs inpu... | 12/25/1984 |
| 4341981 | Rotary direction reversing apparatus for a motor of a microcassette tape transport A direction reversing apparatus for a rotary motor of a microcassette tape transport includes a motor (14) having substantially the same characteristic for the forward and reverse motor rotation directions for driving a recording tape, and a motor control... | 07/27/1982 |
| 4336562 | H-Switch having short to plus protection An H-switch driver circuit includes two pairs of opposed drive transistors each pair being selectively energized to control the polarity of power applied to a load. Each pair of transistors is energized by a power current mirror that includes an NPN trans... | 06/22/1982 |
| 4290000 | Power amplifier with current limiter circuit A power amplifier is disclosed for controlling the current flow through a load, such as a d-c servo motor. The amplifier includes a plurality of switching elements connected in bridge fashion with the load and a predetermined power source for coupling the... | 09/15/1981 |
| 4275340 | Control circuit for a final control element, in particular an electric motor In order to control the motion of a final control element, for example a servomotor used in the steering gear or the cruise control of a motor vehicle, and to provide for rapid dynamic braking of the servomotor by short-circuiting, the invention provides ... | 06/23/1981 |
| 4251757 | Power control system and apparatus thereof Power control system comprising an intermittent device for applying intermittent voltage between intermittent voltage terminals; the intermittent device having a DC input terminal and at least one pair of intermittent terminals; a plurality of pairs of re... | 02/17/1981 |
