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| Number | Title | Issue Date |
| 8103153 | Reliable monitoring of the speed in coordinate measuring appliances In a method for reliably monitoring the speed of a moveable coordinate measuring device, a first value of the speed is calculated from measured values of the coordinate measurement system. The measured values contain information on positions of the coordinate measur... | 01/24/2012 |
| 7889977 | Single output H-bridge drive Disclosed is a drive circuit for generating the drive current used to energize the windings of a motor. The drive circuit includes a data processing unit that produces two outputs used to control an H-bridge and generation of the drive current. One output, a commuta... | 02/15/2011 |
| 7844170 | Method for controlling fan speed A method for controlling a fan speed is disclosed. The fan cools a CPU in a computer. The method includes defining a CPU-max-temp value of a CPU, such that the first fan speed is linearly enhanced with the increase of a real temperature value of the CPU, when the re... | 11/30/2010 |
| 7800324 | Continuous mode velocity control of voice coil motor A method of controlling the velocity of a voice coil motor (VCM), including sensing a voltage difference between the VCM and a sense resistor and driving a velocity control loop (VCL) based on the voltage difference. There is also a control loop circuit, including a... | 09/21/2010 |
| 7715698 | Control electronics for brushless motors An electronic control circuit controls a brushless DC motor. It includes an input power supply control circuit. A microcontroller integrated circuit has control functions to control a brushless DC motor. Additional control functions are provided by software program ... | 05/11/2010 |
| 7444070 | Fan motor with digital controller for applying substantially constant driving current An improved fan arrangement features a radial or diagonal fan (370) with which a direct current motor (32) is associated as its drive motor, further comprising a digital control element (23, 24) which executes a program, for controlling the curr... | 10/28/2008 |
| 7421301 | Speed-variable maximum delay clamping when using variable-delay random PWM switching A control system and a method of using the same for an electric machine having a random number generating module generating a random number ranging from a first value to a second value, a multiplying module multiplying the random number and a sample rate to generate... | 09/02/2008 |
| 7362060 | Self-learning control system and method for controlling fan speed A feedback control logic system for commanding a particular air conditioning unit fan speed is driven by a pulse-width modulated signal from a control unit. The engine control unit decrements the pulse-width modulated signal to the air conditioning unit fan and allo... | 04/22/2008 |
| 7359066 | Electro-optical measurement of hysteresis in interferometric modulators Disclosed herein are methods and apparatus for testing interferometric modulators. The interferometric modulators may be tested by applying a time-varying voltage stimulus and measuring the resulting reflectivity from the modulators. ... | 04/15/2008 |
| 7352094 | Equipment fan An improved fan useful for ventilating applications in motor vehicles features a modular structure, which facilitates quick replacement of any components likely to fail. A first module (110) is intended for permanent installation on the part that is to be coo... | 04/01/2008 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 03/25/2008 |
| 7339343 | Method for correcting speed feedback in a motor A method for correcting speed feedback in a drive motor by calculating the averages of speed reference and speed measurement for both downward and upward constant-speed travel and then identifying the gain and zero factors and correcting the measured speed measureme... | 03/04/2008 |
| 7338260 | System and method for controlling current provided to a stepping motor A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing expected load torque values thr... | 03/04/2008 |
| 7340158 | Method and circuit configuration for controlling a polyphase brushless electric motor A method is specified for controlling a polyphase brushless electric motor, wherein the motor phase currents which are associated with the phases are produced by clocked variation of the respectively applied electrical potential. In this case, the motor phase curren... | 03/04/2008 |
| 7332886 | Control system of motors for rotating a disk and for positioning heads of a mass storage disk device An integrated control and power driving system moves a read/write head carrying arm over the surface of a disk. The integrated control and power driving system is applicable to a spindle motor, a mass storage disk drive and a voice-coil motor, for example, and inclu... | 02/19/2008 |
| 7317293 | Displacement control system for a vehicle axle Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circuit of a motor includes: a PWM ... | 01/08/2008 |
| 7317304 | Inductive load driving device An inductive load driving device includes two inductive loads (20A, 20B) connected to a power source (21), two switching elements (15A, 15B), which are connected in series to the two inductive loads, respectively, their on/off are ... | 01/08/2008 |
| 7301294 | Motor speed control integrated circuit A motor speed control integrated circuit which controls a rotational speed of a motor by controlling the amount of current flowing through a drive coil of the motor. The integrated circuit comprises a first input terminal to have an analog speed-specifying signal in... | 11/27/2007 |
| 7283733 | System and method for regulating a load by utilizing pulse width modulation The invention is directed to a system and method for regulating a load (such as a CPU). A pulse-width-modulation (PWM) regulator calculates the duty cycle of the control pulse from a PWM controller, and then compares the duty cycle to a predetermined threshold. Ther... | 10/16/2007 |
| 7278601 | Speed-adjustable life-saving apparatus Provided is speed-adjustable life-saving apparatus which comprises a housing, a drum disposed in the housing, a life rope and a resistance wheel hub motor. One end of the life rope is fastened and wound on the drum. The resistance wheel hub motor disposed in the dru... | 10/09/2007 |
| 7279862 | Fault handling of inverter driven PM motor drives An apparatus includes a multi-phase inverter, a fault detector to indicate a detection of a fault, a sensor to provide a speed signal indicative of whether a speed of a PM motor is greater than a transition speed, and a controller. The controller is operable to appl... | 10/09/2007 |
| 7276867 | Controller arrangement with adaptive non-overlapping commutation A PWM controller for a direct current brushless motor comprising first and second windings includes a motor drive circuit receiving pulse width modulation control signals to drive the first and the second windings; and a control circuit having inputs coupled to the ... | 10/02/2007 |
| 7268502 | Method and arrangement for controlling the synchronous running of a plurality of electronically commutated motors A method of controlling synchronous running of a plurality of electronically commutated motors (22, 24, 26), each of which includes a stator having a stator winding (40, 42, 44), a permanent-magnet rotor (28, 30, 32), and at least one arrangemen... | 09/11/2007 |
| 7260319 | Abnormality monitoring device for motor control system An abnormality monitoring device monitors a PWM driving signal output from a driving section of an associated motor control system to judge whether the driving section is operating abnormally. By monitoring the output of the driving section, the monitoring device ca... | 08/21/2007 |
| 7249527 | System for sensing absolute torque and a module comprising it A system for determining the absolute torque applied to a rotating shaft includes a sensitive element that is deformable under torsion and a measuring device having first and second coders that are intended to be rotationally fixed, respectively, in the vicinity of ... | 07/31/2007 |
| 7248005 | Dual motor arrangement and control method A dual motor arrangement includes a first motor M1, a first MOSFET Q1 constructed and arranged to control operation of the first motor, a second motor M2, a second MOSFET Q2 constructed and arranged to control operation of the second moto... | 07/24/2007 |
| 7245106 | Controller of pulse width modulation signal-driven device, and method of reducing noise of the device A controller of a pulse width modulation signal-driven device, includes: an instruction input of operating the pulse width modulation signal-driven device; a control section generating a control clock which operates the pulse width modulation signal-driven device; a... | 07/17/2007 |
| 7245094 | Power output apparatus, motor vehicle equipped with power output apparatus, and control method of power output apparatus In the vehicle of the invention, when the temperature of an inverter 42 for driving a motor MG2 linked to front wheels 62a and 62b reaches or exceeds a preset restriction start temperature, the drive control of the invention... | 07/17/2007 |
| 7245098 | Brushless dc motor having a motor-locked protective circuit A brushless dc motor includes a PWM drive IC member, a Hall IC member, a PWM converter circuit and a Rotational Detection (RD) signal line. The PWM drive IC member electrically connects with the Hall IC member, the PWM drive IC member further includes a pin electric... | 07/17/2007 |
| 7242857 | Motor control circuit A motor control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a waveform-shaping circuit connected between the PWM signal generating circuit and the driving circuit. The PWM signal generating circuit generates a squ... | 07/10/2007 |
| 7231139 | Digital noise reduction for motors A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a sche... | 06/12/2007 |
| 7230400 | Electronically commutated motor In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (40). A timer (CNT_HL) brings about an advanced commutation which occurs only once the motor has reached a specific rotation sp... | 06/12/2007 |
| 7230399 | Vehicular generator-motor system A vehicular generator-motor 1 is composed of a rotor, a stator having three phase armature winding 2, and a converter 4. The rotor is provided with a field winding 3 for magnetizing a plurality of magnetic pole pieces 14a... | 06/12/2007 |
| 7224137 | Instantaneous fan stopping method and structure thereof The present invention provides an instantaneous fan stopping method and structure thereof. The method and structure can eliminate the inertial rotating state of the fan when the power supplied to the fan is cut off. In accordance with the present invention, a closed... | 05/29/2007 |
| 7218073 | Fan motor speed control circuit A fan motor speed control circuit is disclosed. The circuit includes a digital/analog converting unit and a driving unit. The digital/analog converting unit takes charge of receiving a pulse width modulation (PWM) signal and converting it into a voltage signal. The ... | 05/15/2007 |
| 7218846 | Fan speed control circuit A fan speed control circuit includes a pulse width modulation (PWM) signal generating circuit, a driving circuit and a phase compensation unit. The PWM signal generating circuit generates a PWM control signal with a sequence of alternating on-time and off-time, and ... | 05/15/2007 |
| 7205733 | Self-startup circuit for DC fan A self-startup circuit for a DC fan includes a voltage sampling device receiving a first control signal, a comparator, and a self-startup device. The comparator includes two input terminals and an output terminal. One input terminal is connected to an output termina... | 04/17/2007 |
| 7199542 | Fan operation adaptive control system A fan operation adaptive control system is proposed, which is designed for use with an electronic system, such as a network server, for providing the network server with an adaptive operation control function; and which is characterized by the utilization of a CPLD ... | 04/03/2007 |
| 7199549 | Feedback parameter estimation for electric machines A method and system for estimating a parameter of an electric machine, including a controller and a switching device, the controller executes a parameter estimation process, which is responsive to at least one of: a current value and a torque command and the resulta... | 04/03/2007 |
| 7199535 | Doubled-ended inverter drive system topology for a hybrid vehicle A double-ended inverter system for a vehicle having a load, a first energy source, and a first inverter system coupled to the first energy source and adapted to drive the load. The double-ended inverter system further having a secondary energy source, a second capac... | 04/03/2007 |
