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7633259 |
Method and apparatus for operating electrical machines
A method and associated apparatus for operating an electrical machine includes providing a brushless excitation system including at least one rectifier having at least one diode. The method also...
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7630180 |
Motor starter circuit
The invention concerns a motor starter circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding ( 4 ) and an auxiliary winding ( 5 ) supplied with...
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7614377 |
Engine control apparatus
An engine control apparatus in which, when it is detected by a starter switch that a starter has changed-over from a drive state into a non-drive state, an ECU (engine control unit) predicts a time...
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7612971 |
Micro-electromechanical system based switching in heating-ventilation-air-conditioning systems
HVAC systems implementing micro-electromechanical system based switching devices. Exemplary embodiments include a HVAC system, including a load motor, a main breaker micro electromechanical system...
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7608940 |
Power supply device and method of controlling the same
A power supply device and a method for controlling the power supply device in which a fusion checking process for the cathode side relay and the anode side relay is easily performed within a short...
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7602594 |
Motor control apparatus and motor control method
To provide a motor control apparatus, including a rotational number detecting means for detecting the rotational number of a motor; a current detecting means for detecting a motor current; a...
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7570008 |
Power module, power converter, and electric machine system for mounting in vehicle
The present invention provides a power module, power converter, and vehicular electric machine system capable of reducing inductance of a peripheral section of an output terminal in a power module,...
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7554780 |
Inverter system, AC rotating machine and electric power converter
In an inverter system including of an electric-power converter and an ac rotating machine, over-voltage generated in the ac rotating machine is controlled by a low-cost system configuration. The...
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7551411 |
Control and protection methodologies for a motor control module
A motor control module designed to control operation of a plurality of different motors in a plurality of different tools a power tool uses an electronic clutch in the module in conjunction with a...
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7531983 |
Method of controlling startup current of motor and disk drive using the method
Provided is a method and apparatus for controlling a motor of a disk drive. The method is used to stably control the startup current of a motor by considering a voltage drop and the disk drive uses...
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7518838 |
Protection of variable frequency power systems from excessive peak electrical potentials
A method of protecting an electromechanical power transfer system from excessive peak electrical potentials, the power transfer system comprising a prime mover, a dynamoelectric machine coupled to...
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7508315 |
Signaling device and method of alerting a work machine operator to a predetermined condition using same
A signaling device includes an electrical circuit which discharges an electrical energy storage device through an electrically powered alert mechanism via a biased open transition switch upon...
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7489483 |
System and method for look ahead detection of electrical problems at a motor of a vehicle
A system for sensing short circuits and open circuits prior to operation of a motor (i.e., while the motor is in a static state), thereby sparing the electrical system from destructive effects of...
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7450356 |
Rotation speed controller for fans
A specially designed rotation speed controller for fans, in addition to basic components like variable resistor, the controller has also been equipped with special components such as TRIAC, micro...
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7375934 |
Power converter controlling apparatus and method applying a fault protection scheme in a motor drive system
A method and apparatus control a power converter ( 20 ) of a motor drive system. The power converter ( 20 ) is controlled during a first operating mode by applying a current control scheme, which...
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7365450 |
Current cutoff circuit and electric steering wheel lock
An electric cutoff circuit for preventing overheating of a load. The current shutoff circuit includes an FET connected to a motor circuit. A relay fault detection circuit is connected to the motor...
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7342371 |
System and method for detecting motor run condition
A motor control system for detecting motor run condition comprises power switches for connection to an AC line for controlling application of AC power to the motor. An input receives a motor start...
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7321214 |
Motor control system
A controller is operable in one of a plurality of operational modes, which include an estimated temperature computation performing mode for performing computing of an estimated temperature of the...
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7321213 |
Motor controller
A motor controller is provided with: an estimated temperature calculating means that calculates an estimated temperature of a motor; and a control unit that can perform a driving control of the...
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7276870 |
Arrangement for overload protection and method for reducing the current consumption in the event of mains voltage fluctuations
The arrangement as overload protection for the mains voltage (U) comprises an electric motor ( 1 ), a compression unit having a compressor ( 2 ), a mains voltage-monitoring unit ( 3 ), a device for...
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7227325 |
Method and arrangement for protecting a frequency converter
A method and an arrangement for protecting a frequency converter in a system comprising a motor and a frequency converter supplying it via a bipolar or multipolar supply connection, the arrangement...
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7224557 |
Method and system of controlling asynchronous contactors for a multi-phase electric load
Control of an induction motor is carried out to limit damaging arcing stress and mechanical stresses placed on the control contactor assembly and the induction motor resulting from the simultaneous...
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7177124 |
Brushless DC fan motor driving circuit
The present invention is a brushless DC fan motor driving circuit, comprising a control unit, a Hall element, a temperature sensor with negative temperature coefficient, and a motor, as tied in...
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7123458 |
Method and circuit arrangement for protecting an electric motor from an overload
A method and a circuit for protecting an electric motor and/or its trigger circuit against overload in the emergency-operation mode in a motor vehicle direct-current fan motor operated by means of...
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7091689 |
Driving circuit for a two-phase DC brushless fan motor
The present invention is a driving circuit for a two-phase DC brushless fan motor comprises a control unit, a Hall element, a motor and a motor protection circuit, an MOS element, a reverse...
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7061736 |
Method to project electronics from load dump
A method for averting damage that may be caused by a transient energy surge during a load dump event, the method including detecting the load dump event and in response causing the consumption of...
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7035064 |
Method and circuit arrangement with adaptive overload protection for power switching devices
Dynamic thresholds for power circuit switch operation are calculated in real-time using instantaneous operating parameter measurements. The dynamic thresholds are self-adapting and are used to...
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7006338 |
System and method for individual phase motor over voltage protection
A motor controller comprises a plurality of solid state switches each for connection between an AC line and a motor winding terminal for controlling application of AC power to the motor. A...
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6778367 |
Method and device for detecting the blocking of a stepper motor
The invention relates to a method of detecting the blocking of a three-phase stepper motor featuring three coils, characterised in that, with the stepper motor having its coils connected in star...
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6744609 |
Motor control circuit having motor protective circuit
When an operation switch of a motor control circuit is switched on or when the operation switch and an automatic operation switch are simultaneously switched on, a switching device is switched on...
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6728084 |
System and method for overvoltage protection of an integrated circuit
A protection system for an integrated circuit is disclosed. A detection system detects an overvoltage condition and provides an overvoltage condition signal to indicate a condition in which...
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6713979 |
Actuator drive circuit
In the invention, pairs of output transistors are provided. An actuator having an inductance is connected to nodes formed between the pairs of output transistors. A drive circuit for the actuator...
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6522256 |
Hybrid current and voltage sensing system
A system and method for sensing current and/or voltage in a utility system including a plurality of power lines. In particular, a central controller is in communication with and enables a...
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6438973 |
Control board alarms
Electronic circuitry provides protection for refrigeration machines by continuously monitoring supply voltage conditions and various other conditions. Information regarding abnormalities detected...
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6259587 |
Direct current motor safety circuits for fluid delivery systems
A safety circuit system for a DC driven device for use with a fluid delivery system includes a first voltage potential DC power line, a second voltage potential DC power line, a controller and a...
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6198241 |
Motor protection for a powered door system
A motor protection circuit for an electric motor driven by a pulse width modulated amplifier. It has a capacitor and a first conduction path connected to a first terminal of the capacitor and...
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6150792 |
Phase monitor
A phase monitor for a short-circuited asynchronous three-phase motor comprises a first and a second sensing unit, both of which are connected to a supply voltage line to the motor in order to sense...
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6108179 |
Emergency shut-down apparatus for motor
Emergency shut-down circuit is provided for a multiplexed circuit. The emergency shut-down circuit includes a plurality of contacts arrayed in parallel to each other and which are synchronously...
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6104156 |
Device for controlling the stopping of a motorized shrouding product
Device for controlling the stopping of a shrouding product driven by an asynchronous motor having a phase-shifting capacitor (1) stopping the motor when the shrouding product encounters an abutment...
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6094021 |
Motor drive apparatus
In a motor drive apparatus, a motor drive circuit includes an H bridge circuit composed of four field effect transistors or FETs, and resistors each having electrical resistance sufficiently higher...
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6009362 |
Anomalous condition detecting apparatus for cooling motor fan
The present invention relates to an apparatus for detecting an anomalous condition of a cooling motor fan to be mounted on a vehicle. The anomalous condition detecting apparatus includes a detector...
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5977742 |
Electric vehicle control device
An electric vehicle control device controls an induction motor with a VVVF inverter. A first calculation means calculates a rotor-resistance correction value of the induction motor based on a...
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5959817 |
Control device for operating a wiper motor
A control device for operating a wiper motor (10) which utilizes the typical path of the wiper motor current (Im) with cyclically recurring minima during the detection of an overload of the wiper...
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5929576 |
Protection apparatus for brushless motor
A protection apparatus used in a brushless motor is arranged by a brushless motor; a commutation signal detecting unit for detecting a position of a movable member of the brushless motor; a speed...
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5870266 |
Bridge control circuit and method
A method and control circuit for an electronic switch, and more particularly the high side switch in a bridge circuit. Control is established by continuous and/or the combination of continuous and...
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5808441 |
Microprocessor based motor control system with phase difference detection
The present invention involves a control system for a motor having a main winding and an auxiliary winding disposed on a stator. A microprocessor determines the phase difference between the line...
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5757151 |
DC pump drive module
A hybrid vehicle utilizes a power unit to store and convert power between a turbine alternator, flywheel and traction motor. The power unit includes a water cooled heater exchanger for cooling...
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5703451 |
Motor driving circuit
Between one end of a motor coil and the ground, a drive transistor is connected. When the drive transistor is turned off, and in particular at the moment when a current flowing through the motor...
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5604653 |
Protection component for a three-phase alternator used in automobile vehicles
A three-phase alternator protection component is associated with a rectifying bridge. Three Shockley diodes and an avalanche diode are interconnected through three electrodes, of a first polarity,...
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5596471 |
Adjustable undervoltage trip fault interrupt circuit
An adjustable undervoltage trip fault interrupt circuit is used to prevent "nuisance" undervoltage fault trips caused by instantaneous sags in the AC power lines of less than a selectable time. The...
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