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9035583 System for controlling the speed of an electric fan  
The system has a driving circuit for the motor of the electric fan, coupled to the electrical system of a motor vehicle and having a plurality of controlled electronic switches, and an electronic...
9001476 Multimotor variable frequency overload  
An apparatus for protecting a motor includes two or more motor overloads, within a motor overload enclosure, protecting two or more motors. Each motor overload includes one or more current sensors...
8988836 Power circuit, and computer-readable recording medium storing a control program for power circuits  
When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and...
8964338 System and method for compressor motor protection  
A system includes a refrigerant compressor including an electric motor, a current sensor that measures current flow to the electric motor, a switching device configured to close and open to allow...
8947838 Overcurrent fault detection device for electrical drive control system  
According to the present invention, an overcurrent fault detection device includes: an inverter converting DC current to three-phase AC currents for driving a motor; a DC voltage detector; phase...
8947028 Method and system for detecting fault of parallel coil type permanent magnet motor  
Disclosed are a method and system for detecting a fault of a parallel coil type permanent magnet motor. This method includes driving a parallel coil type motor on the basis of a pre-defined...
8913353 Method and system for detecting fault of serial coil type permanent magnet motor  
A method and system for detecting a fault of a serial coil type permanent magnet motor includes driving the motor based on a predefined current reference value, detecting a phase current vector of...
8912893 Circuit monitoring device  
The circuit monitoring device is disclosed. The device is for monitoring circuit resistance. At configurable thresholds digital flags are triggered, the device can be used as a Security/Building...
8907603 Steering control apparatus  
A steering control apparatus includes a direct current power source, a three-phase alternating current motor, and a motor driving circuit. An emergency switching element is provided on at least...
8867181 Protection of motor drive systems from current sensor faults  
Methods and apparatus are provided for detecting a phase current sensor fault in a multi-phase electrical motor. The method comprises, receiving an input torque command T* and measuring a set of...
8837096 Fault monitor for fault tolerant implantable pump  
A implantable pump system comprises an implantable pump motor and an external unit. An inverter comprises respective phases with redundant legs connected in parallel, and respective current...
8716967 Motor control device  
A motor control device for controlling a three-phase brushless motor that has a rotor and field coils includes: a load range determining unit that determines a rotor rotation angle range, in which...
8675321 Start test electronic device and system and method of use thereof  
The present invention is a method and system for monitoring the continuous flow of power delivered by multiple DC Direct current operated starter motors used to start engine driven electrical...
8648560 Electric motor control apparatus  
In an electric motor control apparatus, an electric motor driving unit includes: a current detection unit configured to detect a current flowing through a current detection place in the electric...
8649130 Motor driving apparatus having fault diagnostic function  
A motor driving apparatus capable of detecting during operation a ground fault and a phase-to-phase short circuit by distinguishing one from the other is provided while minimizing an increase in...
8605393 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...
8493012 Protection relay, electrical switching apparatus, and system for determining and outputting fault current available at a load and incident energy or personal protective equipment level operatively associated therewith  
A protection relay for an electrical switching apparatus for a load includes a number of voltage sensors structured to sense voltage applied to the load, a number of current sensors structured to...
8412432 Protective arrangement for the protection of safety-relevant electronic circuits from malfunctions  
A protective circuit arranged on a Printed Circuit Board (PCB) has two conductor loops. At least one supply voltage track, at least one semiconductor switch and at least one control component are...
8405339 System and method for detecting fault in an AC machine  
A system and method for detecting a rotor fault condition in an AC induction machine is disclosed. The system includes a processor programmed to receive voltage and current data from an AC...
8390965 Over-current protection device for multiple high-voltage motive devices and method thereof  
An over-current protection device for multiple high-voltage motive devices is provided. The over-current protection device includes a comparison module and a logic operation module. The comparison...
8384325 Motor driving circuit and method for driving motor  
A motor driving circuit receives a control pulse signal pulse-width modulated according to a target rotational speed, and drives a fan motor. A start pulse signal generating unit generates a start...
8355226 Ground fault sensing device  
A ground fault sensing device for a drive system that converts direct current electrical power from a direct current power supply into alternating current electrical power and drives an electric...
8315021 Motor detecting and protecting apparatus and its method  
A motor detecting and protecting apparatus electrically connected with a motor. The motor detecting and protecting apparatus includes a detecting unit, an error determining unit, a controlling...
8279565 Methods and systems relating to overcurrent circuit protection  
Systems and methods for providing overcurrent circuit protection are disclosed. A method of providing overcurrent circuit protection may include setting a threshold current value according to an...
8278851 Drive apparatus having a stepping motor  
A drive apparatus includes a magnet rotor having a plurality of magnetic poles that are magnetized, a stator having a magnetic pole portion that opposes each pole of the magnet rotor, a coil...
8274768 Inverter device  
The inverter device includes an IGBT bridge circuit, a drive block which has an upper arm photocoupler and a lower arm photocoupler, and a control block including a CPU which generates gate...
8274772 Current detection and limiting method and apparatus  
An apparatus for detecting and controlling current. A current detector for generating a first value that represents an amount of current being delivered to a device. A current limit circuit for...
8270130 Device for sensing the functioning of an electrically powered device  
An electrical monitoring device for monitoring an electrically powered device is provided. The monitoring device includes a frame for placement onto a conductor of the electrically powered device....
8269451 Power conversion device  
A power conversion device includes: an inverter that drives an alternating-current motor by converting a direct-current voltage into an alternating-current voltage of an arbitrary frequency; an...
8245525 Heat source apparatus, heat source system, and method for operating heat source apparatus  
A heat source apparatus in which a control device of the heat source apparatus can ascertain a stoppage of an inverter device and in which a stable operating time of the heat source apparatus can...
8242719 Connection of an electric motor to a supply network  
Method and arrangement for connecting an AC electric motor (M1, M2, . . . MN) to an AC electricity network (L) in a system which comprises a frequency converter (FC), with which the motor is...
8228648 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...
8228647 Electrical power diagnostic system  
An electrical power diagnostic system includes a system housing, a power saw management system, and a user interface. The system housing is electrically connected with the power unit of the power...
8217608 Electric power supply device  
An electric power supply device capable of miniaturizing an FET and wiring and reducing the amount of heat generation even when a motor load goes into a lock state is provided. It is determined...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...