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| Number | Title | Issue Date |
| 8188694 | Parallel power inverter motor drive system Multiple inverter motor drives are interconnected in parallel to provide a common output to a motor. Common control circuitry is coupled to all parallel drives via optical cables and provides signals to power layer circuitry of each inverter for generation, at the p... | 05/29/2012 |
| 8183808 | Motor overload protecting method A motor overload protecting method includes (a) detecting an instantaneous motor current value in real-time, calculating a current integral value in each of a corresponding integral period, and resetting the current integral value to 0 at an end of the integral peri... | 05/22/2012 |
| 8179069 | Electric power tool, control unit and recording medium An electric power tool includes a direct current motor, at least one switching device, a trigger switch, a control unit, and a drive unit. The control unit sets a driving duty ratio for PWM controlling the direct current motor so as to increase the driving duty rati... | 05/15/2012 |
| 8174226 | Current limit control method of DC motor and related device and circuit A control method of a current limit of a DC motor includes generating a reference voltage according to a preset current limit value of a DC motor; comparing the reference voltage with the voltage drop of a power control switch which drives the DC motor to generate a... | 05/08/2012 |
| 8174225 | Limiting peak electrical power drawn by mining excavators The maximum electrical power drawn from an electrical power source by a mining excavator comprising electric motors is reduced by supplying supplementary electrical power from an electrical energy storage unit. The input electrical power drawn by the mining excavato... | 05/08/2012 |
| 8169174 | Motor circuit and electric power steering apparatus In a steering control unit, a U-phase feed line branches into paired branch feed lines, phase-open MOSFETs are provided in middle portions of the branch feed lines, phase-open MOSFETs are provided in middle portions of a V-phase feed line and a W-phase feed line, an... | 05/01/2012 |
| 8164287 | Motor drive control apparatus and method In application of a square wave voltage to a motor MG2 to make the motor MG2 output a torque equivalent to a torque command Tm2*, the procedure of square wave control corrects reference phases ψb and −ψb as phases for maximizing an absolute ... | 04/24/2012 |
| 8159165 | Motor drive circuit A first semiconductor switching element connects to a high side of a motor and includes a diode whose cathode faces the high side. A second semiconductor switching element having a diode resides on a low side of the first semiconductor switching element. A third sem... | 04/17/2012 |
| 8159170 | Integral type air conditioner When cooling operation or dehumidifying operation is started, a blower fan for an evaporator and an exhaust fan for a condenser are driven at an initial rotational number. A compressor is driven at a fixed rotational number. Due to load variation, an operating curre... | 04/17/2012 |
| 8148929 | Power electronic module IGBT protection method and system A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for reducing the switching frequency of an inverter module based on the junction temperature variation of the IGBT. ... | 04/03/2012 |
| 8143831 | Regulating device for regulating the voltage on a high-side load The invention to an electronic control system, controlled by a pulse width-modulated signal (SG) related to earth, for regulating the voltage (Umot) across a high-side load (M), in particular a fan control unit for motor vehicles. The circuit part that converts the ... | 03/27/2012 |
| 8115437 | Torque limit of PM motors for field-weakening region operation The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based ... | 02/14/2012 |
| 8111027 | Motor drive device The present motor control device detects from the speed of a motor and a current driving the motor that the motor is overloaded, and exerts control to set a target torque based on the detected overload state of the motor to cause the motor to output a maximal torque... | 02/07/2012 |
| 8106614 | Mirror adjustment mechanism, wing mirror unit and method An electric motor circuit for controlling an electric motor of a mirror adjustment mechanism includes a switch-off circuit that is provided with a current sensor for measuring the electrical supply current and, depending thereon, generating a voltage. In an embodime... | 01/31/2012 |
| 8076885 | Integrated overload and low voltage interrupt module A power management module for a winch system comprises an overload and low voltage interrupt module within a housing. The overload interrupt determines operating current for the winch system and provides an interrupt signal when the current is greater than a thresho... | 12/13/2011 |
| 8049450 | Fan control circuit A fan control circuit for controlling a fan to dissipate heat from an electrical device includes a comparator and an electrical switch. The comparator has a comparator input terminal, a comparator reference terminal, and a comparator output terminal. The comparator ... | 11/01/2011 |
| 8030869 | Drive amplifier system and over-current detection method for the same A drive amplifier system includes a drive control device, a power supply, and at least one drive amplifier. The power supply includes a power control circuit, a rectifier, and a current sensor. The power control circuit includes an over-current detection circuit, a ... | 10/04/2011 |
| 8026684 | Electronic control system The invention relates to an electronic control system for controlling a voltage across a load, in particular across a fan motor of a motor vehicle, as a function of a control signal, comprising: a setting transistor, a transistor, which activates the control channel... | 09/27/2011 |
| 8022651 | Electric power steering device Provided are an electric power steering device which is capable of determining a failure without using a motor current, and an electric power steering device which removes any motor current detecting unit for detecting the motor current such as a shunt resistor, and... | 09/20/2011 |
| 8013557 | Motor protection device and method A motor protection device includes a detection unit for detecting an operating state of a motor and outputting a detection signal; a reference unit for generating a variable reference signal; a discriminating unit for comparing the detection signal with the variable... | 09/06/2011 |
| 8008881 | Voltage protecting apparatus A voltage protecting apparatus is used for detecting voltage of a motor driver, and adjusting the voltage of the motor driver when at an over-voltage state. The motor driver includes a direct current (DC) power source and a power board. The voltage protecting appara... | 08/30/2011 |
| 7999499 | Rotating electrical machine control system and vehicle drive system A rotating electrical machine control system includes a rotating electrical machine, a frequency conversion portion, a voltage conversion portion, a torque limitation portion, and an abnormality detection portion. The torque limitation portion limits generation of a... | 08/16/2011 |
| 7960932 | Method for controlling an electrical door drive Disclosed is a method for controlling an electrical door drive by means of which the door drive is switched off if the maximum torque is overshot and/or a defined nominal closing rate of the door is undershot as a result of the door drive being obstructed. In order ... | 06/14/2011 |
| 7952311 | Method and apparatus for variation of a rated current The invention relates to a method for variation of a rated current which is specific of a motor by providing a rated current basic value signal (2) depending on a rated current basic value of the motor Irated, and by detecting an actual temperature... | 05/31/2011 |
| 7952312 | Closure panel control apparatus A controller computes a pinching amount of an object caused by a window glass. The controller estimates a prior pinching amount of the object caused by the window glass before the controller computes the pinching amount of the object. The controller confirms occurre... | 05/31/2011 |
| 7932687 | Actuator system An actuator system, preferably for patient lifters, includes at least one actuator driven by an electric motor, a control unit having a power limiting circuit, and at least one handset having a plurality of keys. The actuator system is arranged such that the thresho... | 04/26/2011 |
| 7906926 | Door drive control apparatus and door drive control method A door drive control apparatus capable of an accurate detection, without misidentifying an inverse overrun condition, and a door drive control method that improves safety. The door drive control apparatus includes a power converter that supplies power to a door driv... | 03/15/2011 |
| 7906927 | Signal input method and opening/closing controller It is intended to realize a signal input method which makes it possible to add another method to an existing method later in a simple manner as well as an opening/closing controller which employs two methods and can be constructed by adding another method to an exis... | 03/15/2011 |
| 7852029 | Control device and control method of boost converter A control device of a boost converter which includes: an inverter circuit which controls switching to apply current to a stator winding of respective phases of a multi-phase brushless DC motor; and a boost circuit which is provided on an input side of the inverter c... | 12/14/2010 |
| 7800330 | Method for regulating a voltage or a current of an RLC filter, a recording medium and vehicles for this method This deadbeat control method for regulating an output voltage Uc or an output current Il of a low-pass RLC filter includes: calculation (92) of a current setting Īuc for the average intensit... | 09/21/2010 |
| 7800329 | Motor control device, method and program storage medium There are provided a motor control device and a method for deciding a velocity instruction shape within the limit of a movement range, a velocity, and an acceleration of an object device while maintaining the acceleration as high as possible in inertia identificatio... | 09/21/2010 |
| 7791297 | Method of controlling a motor A method for controlling a motor (2) which drives a disk-shaped tool (4) of a power tool (1) and to which a motor voltage in the amount of a nominal value is applied in an “on” position of a motor switch (6), includes determination of... | 09/07/2010 |
| 7791298 | Motor driver system and method for protecting motor driver A motor driver system includes an inverter configured to apply a three-phase voltage to a motor; an inverter driver configured to generate a reference voltage to the inverter to control a motor speed to follow a reference speed; and a motor protector configured to c... | 09/07/2010 |
| 7791296 | Motor protection system To precisely detect the temperature of a power assist motor without using a temperature sensor and enhance an overheating protection function. A calorific value calculating unit calculates a calorific value based upon the difference between a calorific value by curr... | 09/07/2010 |
| 7782000 | Motor controller and electric power steering apparatus When a failure of an electric current flow occurs in any one of phases, a microcomputer calculates a d-axis current command value that changes along a tangent curve with predetermined rotation angles as asymptotic lines. The microcomputer continuously outputs a moto... | 08/24/2010 |
| 7777440 | Motor driving circuit and method for controlling a motorized roller A motorized roller incorporating a driving motor for driving the roller and accompanied with a motor driving circuit for driving the motor, including a lock detecting structure adapted to detect a lock of at least one of the driving motor and the motorized roller an... | 08/17/2010 |
| 7759891 | Apparatus and method for detecting abnormal conditions of a motor The present invention provides an apparatus and a method for accurately detecting abnormal conditions of a motor. A ΔTc/Tj detector detects a difference (ΔTc) between an environment temperature and a temperature of a field-effect transistor (FET) which turns on an... | 07/20/2010 |
| 7667422 | Fan with failure detecting function A fan with failure detecting function includes a power input terminal, a current limiting resistor, a light emitting diode (LED), and a fan motor. The power input terminal is coupled to the anode of the LED via the current limiting resistor. The cathode of the LED i... | 02/23/2010 |
| 7642738 | Power steering apparatus A power steering apparatus includes an electric motor, a temperature sensor, and a control unit. The electric motor produces an assist steering effort in a steering system. The temperature sensor measures a temperature of a first portion subject to thermal influence... | 01/05/2010 |
| 7633252 | Bidirectional motor stall protection circuit A stall protection circuit is provided for bidirectional motor operation that is controlled by a half bridge switch that has forward, reverse and off positions. A method of protecting a motor is also disclosed. A Hall effect current sensor may be provided in a stall... | 12/15/2009 |
