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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...
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8169177 |
Electric vehicle
An electric vehicle includes a control unit having overcurrent generation judgment unit, inverter selection unit, and inverter drive control unit. The overcurrent generation judgment unit judges...
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8159792 |
Motor control device
In a motor control device that drives a plurality of motors with one DC power supply, detection of a short circuit fault occurring in the motors is realized with an inexpensive configuration. In...
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8144438 |
Motor control center communication system
A motor control center communication system configured to interface with a communication network. The system includes a plurality of motor control units (MCUs), and a MCU controller configured to...
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8094006 |
Portable bearing test device
A portable bearing test device includes a power supply that is operable to supply direct current (DC) electrical power via a plurality of power supply outputs and a circuit common. Independent...
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8085514 |
Modular on-machine controller
A modular control assembly is provided for on-machine control of a desired machine. One embodiment has a machine mountable base and a replaceable control unit, wherein the machine mountable base...
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8045302 |
Compressor protection and grid fault detection device
A compressor monitoring system includes current and voltage monitors, current and voltage averaging modules, a control module, and a switch. The current monitor measures a current drawn by a motor...
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8035934 |
Shift switching device and shift switching method
A shift-by-wire shift switching device and shift switching method that switch a shift range of an automatic transmission using an electric motor. The shift switching device includes a controller...
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8031446 |
Method of detecting output phase loss for motor driver
A method of detecting an output phase loss (OPHL) for a motor drive detects an abnormal OPHL operation when at least one phase of a three-phase current is continually zero. Each phase of the...
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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...
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8018695 |
Fuel pump control apparatus
A control apparatus for controlling a fuel pump includes: an electronic switch provided in a circuit for connecting a power supply to a motor for driving the fuel pump; a current detector which...
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8013547 |
Detection and delimitation of maximum stator currents
A device for driving a magnetic levitation train has at least one controllable power supply unit that feeds at least one multi-phase power supply line, and a long stator with stator windings that...
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8014110 |
Variable speed drive with integral bypass contactor
Systems and methods for operating a variable speed drive to receive an input AC power at a fixed AC input voltage and frequency and provide an output AC power at a variable voltage and variable...
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8004803 |
Variable speed drive
Systems and methods for improved Variable Speed Drives are provided. One embodiment relates to apparatus for common mode and differential mode filtering for motor or compressor bearing protection...
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7980085 |
Compressor diagnostic system
A system is provided and may include logic circuitry in communication with an intelligent device. The logic circuitry may process a refrigeration system operating parameter as a function of time...
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7960927 |
Electric motor control device and drive unit
An electric motor control device includes a power supply unit that supplies power to a three-phase electric motor; a three-phase current sensor that individually detects three respective phase...
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7954334 |
Inverter system and vehicle
An inverter system having a semiconductor device, and a railway vehicle using this inverter, provide a more accurate determination of whether an abnormal heat generation from the inverter is...
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7948192 |
Dual redundant variable field permanent magnet dynamoelectric machine
A dual redundant permanent magnet type dynamoelectric machine includes a dual flux throttle system to selectively disable one of a first motor and a second motor.
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7880418 |
Electromechanical drive system, in particular for progressive cavity pumps for oil wells
The following invention is an electromechanical system (1) that is to be connected to an electricity supply (7), comprising: an electric machine (2) that can operate as an independent generator...
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7852026 |
Motor drive apparatus and motor drive control method
A protection circuit is configured to change control modes in a drive control process of a drive circuit for a motor when overvoltage is applied to a power source line while the motor is driven....
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7848067 |
Soft start motor control using back-EMF
A method of controlling in-rush current to a DC motor is disclosed. The method may include operating the DC motor in a first mode including applying back-EMF across a relay coil to maintain the...
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7848066 |
Motor drive device and electronic device using the same
A motor drive device includes: chopping signal generation means for generating a chopping signal Sa when drive current of a driver has reached a first threshold value; chopping signal cut-off means...
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7848122 |
Terminator for reducing differential-mode and common-mode voltage reflections in AC motor drives
A terminator reduces reflections on power lines connecting an inverter to an AC motor by providing a differential-mode reflection damping element and at least one common-mode reflection damping...
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7843674 |
Motor drive circuit
A motor-drive circuit comprising: a current-passage-control circuit to perform ON/OFF control of a drive transistor connected to a motor coil to pass current through the motor coil; an...
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7843671 |
Electric machine control system
A drive system for an electrical machine is provided. The system includes a control unit and a monitoring unit, which is independent of the control unit. The control unit includes a device that...
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7813089 |
Motor controller and electric power steering apparatus
In a motor controller, if a failed electric current flow in any one of phases of a motor is detected, a motor control signal is generated, based on a phase other than the phase with the failed...
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7795825 |
Over-voltage and under-voltage management for electric drive system
A method of voltage supply management for an electric drive system includes receiving a voltage signal (1002) indicative of a voltage in a supply link, and one or more condition signals that are...
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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 mot...
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7791293 |
Motor controller and electric power steering system
A current sensor of a motor controller detects the current applied to a motor drive circuit and thus a phase where a failure cannot be detected would occur without taking any measures. However, an...
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7768750 |
Cordless power tool
To provide a cordless power tool which can suppress heat generation of a protection unit and prevent the erroneous operation. A cordless power tool 1 includes a body casing 10; a battery 20 which...
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7755317 |
Methods for electric vehicle motor control and rotor position detection fault-tolerant processing
This invention provides methods for electric vehicle motor control and rotor position detection and fault-tolerant processing. The rotor position signal sampled by the system is compared with the...
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7751159 |
Pump controller system and method
A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed...
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7746604 |
Method, system, and computer software code for detection and isolation of electrical ground failure and secondary failure
In an off-road vehicle having a resistor grid network and a blower system as part of a braking system operable to determine at least one of a resistor failure and a blower failure, the system...
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7733616 |
Abnormality detecting device of electric power converting device and abnormality detecting method
Each of three-phase arm of an inverter has first and second switching elements connected in series together at a connection point to the corresponding phase coil of the three-phase motor. Control...
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7706111 |
Motor lock detection circuit
A motor lock detection circuit for detecting lock of a motor, comprising: a binarizing circuit to binarize a signal, obtained from the motor, having a frequency corresponding to rotation speed of...
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7675720 |
Motor protection using accurate slip calculations
An accurate slip calculation for providing monitoring and protection to an electric motor. The slip calculation is made using a minimum value of stator resistance as the initial stator resistance,...
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7652438 |
Drive arrangement for a portable working machine
A drive arrangement for a hand-guided working machine for agriculture, forestry and horticulture applications. The drive arrangement comprises an electric motor, a DC power source for electrical...
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7643256 |
Electromechanical switching circuitry in parallel with solid state switching circuitry selectively switchable to carry a load appropriate to such circuitry
A switching system is provided. The switching system includes electromechanical switching circuitry, such as a micro-electromechanical system switching circuitry. The system may further include...
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7623327 |
Motor protective device
A heating value calculation part obtains a substantial heating value based on the difference between a heating value and a radiating value attributed to a motor supply current. The radiating value...
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7623328 |
Driving control apparatus for motion mechanism and control method of driving control apparatus
When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also...
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7622874 |
Over current detection circuits for motor driver
A motor driver includes an H-bridge having a first differential input, a second differential input, and a differential output; a sensing circuit coupled to the differential output of the H-bridge;...
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7609491 |
Clothes dryer motor with broken belt switch
A clothes dryer includes a motor adapted to be mounted on a frame of the dryer for driving a dryer belt to rotate a drum of the dryer. The motor includes a rotor adapted to rotate the belt, at...
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7589942 |
MEMS based motor starter with motor failure detection
A motor starter is disclosed. The motor starter includes control circuitry integrally arranged with at least one current path and a processor included in the control circuitry. The motor starter...
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7586285 |
Ground fault detection device for motor driving circuit
A motor driving circuit includes an inverter circuit including switching devices connected in a bridge manner, electric-current detection resistances connected between the lower switching devices...
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7565267 |
Life prediction and monitoring of components
A counting unit counts a current supplying duration for a component which determines a life of a device. A prediction unit predicts the device life based on an integrated current supplying duration...
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7561389 |
Alternating-current voltage output apparatus
Inverters, based on signals from a control device, generate a commercial AC voltage across neutral points of 3-phase coils. A Y-capacitor for removing noise is connected to a load outside the...
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7545613 |
Method of controlling seatbelt retracting device with motor
In controlling a seatbelt retracting device having a mechanism for retracting a seatbelt with a motor, a current flowing to the motor is detected, and a rate of increase in the current is...
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7542250 |
Micro-electromechanical system based electric motor starter
A motor starter is provided. The motor starter includes micro-electromechanical system switching circuitry. The system may further include solid state switching circuitry coupled in a parallel...
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7538508 |
Thermal overload protection
A thermal overload protection for an electrical device, particularly an electric motor (M), measures a load current supplied to the electrical device (M), and calculates the thermal load on the...
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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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