Matches 1 - 50 out of 58 1 2 >


Match Document Document Title
US20090310264 MOTORISED BARRIER ROLLER  
A fire or smoke barrier 1 has a curtain 2 deployed from a motorised roller 3 mounted in a head box 4. Remote from the head box and connected to the motor via a cable 5 is a motor controller...
US20110149445 Fault Clearing for Permanent Magnet Machines  
A permanent magnet machine (PMM) has a kinetic portion electrically coupled to a power conversion portion. Motive power is provided to the kinetic portion by a torque applied to a motive shaft...
US20140340796 System and method of automatic detection and prevention of motor runaway  
A robotic catheter control system includes a plurality of electric motors. Diagnostic logic automatically detects motor runaway fault conditions based on the current motor position, the target...
US20060285261 Pulse adjusting protective circuit  
A pulse adjusting protective circuit includes a driving circuit, a running detecting circuit and a pulse trigger circuit. When the driving circuit cannot work normally, the running detecting...
US20070278870 Arrangement in an Electrical Machine  
The invention relates to an arrangement for indicating a fault in an electrical machine having a stator and a rotor with an air gap between it and the stator. In order to detect impurities or...
US20070183102 Protective device for a consumber branch  
A protective device is for a consumer branch. In order to find an easy, constructive solution which is used to protect the consumer branch in a comprehensive manner, the protective device includes...
US20140196508 SYSTEM AND METHOD FOR SAFELY POWERING AN APPLIANCE USER INTERFACE WITHOUT EXTERNAL POWER  
Systems and methods for safely powering an appliance user interface without external power are provided. One exemplary method includes receiving power generated by rotation of a rotor. The method...
US20120182649 Motor Drive Circuit  
A motor drive circuit comprising: a drive circuit configured to supply a drive current to a drive coil of a motor; a control circuit configured to control an operation of the drive circuit; a...
US20120275068 FAULT TOLERANT ELECTRICAL MACHINE  
A fault tolerant electrical machine including: a plurality of phases; a detector arranged to detect a fault in at least one of the phases; and a controller arranged to intentionally cause a fault...
US20130271881 PROTECTIVE CIRCUIT IN A WINDSCREEN WIPER DRIVE AND WINDSCREEN WIPER DRIVE  
The invention relates to a protective circuit (10) in a screen wiper drive (1), consisting of a parallel circuit having two circuit elements (16, 17), wherein one circuit element (16) consists of...
US20130088799 Asset Condition Monitoring in an Electric Motor  
The motor monitoring system of the present disclosure uses several calculated monitoring values to determine a status of a motor and take a predetermined action when a threshold corresponding with...
US20090079435 Load Drive Circuit  
According to the present invention, the operation of a diagnostic circuit within a load drive circuit, which has been built into an electronic control device, is checked without modifying the...
US20110110001 MOTOR OVERLOAD PROTECTING DEVICE, MOTOR START DEVICE, BACKUP PROTECTING ELEMENT AND PROCESS FOR OBTAINING A BACKUP PROTECTING ELEMENT  
The present invention refers to an electric overload protecting device (100) capable of avoid overheating of motors (400) of refrigeration equipment, and further providing an additional protection...
US20100013420 REVERSE DRIVE CONTROL FOR A MOTORCYCLE  
A vehicle comprising a rotatable wheel (e.g., three rotatable wheels), a forward drive mechanism including a forward drive motor (e.g., an internal combustion engine), and a reverse drive...
US20120243129 SHORTING PROTECTION FOR SYSTEMS HAVING ELECTRIC MACHINES  
Shorting protection for systems having electric machines is provided. A protective device is put in shunt with an electric power system and an electric machine. The protective device is in an open...
US20080137240 System and method for monitoring speed signals from multiple fans  
A system and method is provided for monitoring the speed signals of a first fan and a second fan. The system includes a selection signal generation device, a logic gate, a counter and a control...
US20080291588 Motor control microcomputer and control method for the same  
An object of the present invention is to improve safety of a motor by instantaneously detecting the abnormality of a PWM signal. To achieve the object, provided is a motor control microcomputer...
US20140118865 DISCONNECTION DETECTING DEVICE FOR ROTATING ELECTRICAL MACHINE, METHOD FOR DETECTING DISCONNECTION OF ROTATING ELECTRICAL MACHINE  
A disconnection detecting device that can be applied to a control system of a motor-generator is provided. A disconnection detecting section judges whether logical conjunction (i.e. AND operation)...
US20110249368 METHOD FOR DETECTING EARTH-FAULT CONDITIONS IN A MOTOR CONTROLLER  
The present invention relates to a method for determining the existence of an earth-fault on-the-fly and thereby protecting a motor controller having a high- and a low-side DC-link, and having...
US20110007436 DEVICE AND METHOD FOR TAKING A SAFETY PRECAUTION AN IN ELECTRICAL TOOL  
The invention relates to a device (10) for taking a safety precaution in an electrical tool, said electrical tool comprising an electric motor (EM) with at least one field winding and an armature...
US20100123980 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...
US20150229120 OVER-VOLTAGE PREVENTION DEVICE  
According to one embodiment, an over-voltage prevention device is provided between a secondary-winding side of a wound-rotor induction machine and a frequency converter configured to excite the...
US20140340795 PROTECTION CIRCUIT  
A protection circuit includes a protection module and a fan electrically connected to the protection module. The protection module includes a control chip, an inverter, and an electronic switch....
US20140240874 TRACTION MOTOR DRIVE SYSTEM FOR A LOCOMOTIVE  
A traction motor drive system may include a plurality of armatures arranged in parallel with each other. The traction motor drive system may also include a plurality of field circuits arranged in...
US20100219022 ELECTRIC MOTOR DRIVE  
The invention relates to a switch arrangement of an electric motor drive (1). The electric motor drive comprises safety switches (3) determined by the safety of the drive, a controlled mechanical...
US20110051297 Device, Computer Program Product and Computer-Implemented Method for Backspin Detection in an Electrical Submersible Pump Assembly  
A system for determining whether a motor in an electrical submersible pump is backspinning is described herein. The system comprises a sensor mounted in a well bore proximate to a ground surface,...
US20060098359 Surge-suppression system for submersible electric motors  
A submersible motor having electrical-surge protection. The submersible motor includes a motor housing formed from an electrically-conductive material; a stator-winding assembly disposed within,...
US20140055890 CIRCUIT ASSEMBLY FOR AN ALTERNATING CURRENT CONTACTOR, MOTOR PROTECTION RELAY AND METHOD FOR PRODUCING A POWER SUPPLY UNIT  
A circuit assembly for an alternating current contactor has an excitation coil, wherein the excitation coil has at least one first winding for generating a pick-up and/or release current. A method...
US20060007609 Shaft current control brush ring assembly  
A shaft current control brush ring assembly includes a cup and a brush ring assembly secured within the cup. The cup is secured to a motor faceplate, within a recess formed in the faceplate by...
US20150103449 MOTOR PROTECTION DEVICE, MOTOR PROTECTION METHOD, AND MOTOR CONTROL SYSTEM USING THE SAME  
Disclosed herein are a motor protection device, a motor protection method, and a motor control system using the same. According to the present invention, the motor protection device including: a...
US20130176648 POLE-SLIP PROTECTION SYSTEM AND METHOD FOR SYNCHRONOUS MACHINES  
A method of protecting a synchronous machine (10) connected to an electricity network (12) against pole-slip comprises the steps of continuously monitoring a power transfer angle (δ) between an...
US20130077194 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...
US20140111888 FAULT DETECTION SYSTEM AND METHOD FOR OVERSPEED PROTECTION SPEED SENSORS  
A fault detection system for an over-speed protection system of a rotating machine includes a first speed sensor, second speed sensor, and third speed sensor sensing a speed of a shaft of the...
US20130155552 MOTOR DRIVE DEVICE  
A motor drive device according to the present invention includes a motor having a rotor and a drive coil, a rotor position detector, a speed detector that converts position information into speed...
US20060087774 Protection system against an electric motor overload  
In order to ensure a significantly efficient protection for several electric motors, even serially arranged, the invention provides for a protection system (1) against an electric motor (2)...
US20090323232 ELECTRIC POWER CONVERSION DEVICE, COMPRESSOR MOTOR WITH THE DEVICE, AND AIR CONDITIONER WITH THE MOTOR  
The device is provided with an electric power conversion circuit including switching elements for converting a DC electric power to an AC electric power, a load connected to an output side of the...
US20090108786 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...
US20060256488 Medium voltage motor starter including a contactor having motor protection relay functionality  
A contactor for connecting a medium voltage load, such as a medium voltage three-phase motor, to a medium voltage electrical source, such as a medium voltage three-phase electrical source, and for...
US20120081818 System and Method for Fast Discharge of a Ring Motor Field  
High-power synchronous motors are commonly used in mining operations, for example, in gearless draglines, gearless conveyor drives, and gearless mill drives. Substantial electromagnetic energy is...
US20090091866 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...
US20140063661 MOTOR RELAY WITH INTEGRATED ARC-FLASH DETECTION  
Disclosed herein are various embodiments of devices and related methods for detecting an electrical arc event using a motor management relay and for suppressing the electrical arc event. The motor...
US20050286182 Safety switch  
A safety switch for controlling the operation of a motor, including a sensor for generating an signal representing an operating condition of the motor; a filter for attenuating a rate of change of...
US20100109590 DRIVING DEVICE AND PROTECTION METHOD THEREOF  
A driving device includes a motor, a first rotating portion, a second rotating portion, a piezoelectric assembly, and a controlling unit. The motor includes a rotating shaft. The first rotating...
US20080246427 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...
US20100232076 METHOD FOR MITIGATING NEGATIVE SEQUENCE EFFECT RESULTING FROM NON-SYMMETRICAL SHORT CIRCUIT FAILURE OF SYNCHRONOUS ELECTRIC MACHINE BASED SYSTEMS  
A drive system for a multi-phase electric machine with a permanent magnet rotor, the drive system may comprise conduction paths for each phase. Detectors on each of the conduction paths may...
US20050135024 Electric motor  
An electric motor (1) is driven by an inverter amplifier (2) through a cable (5). An absorber (3) is built in the electric motor (1) to suppress and absorb a surge voltage generated due to the...
US20050122641 Apparatus and method for disabling the operation of high power devices  
A drive circuit for delivering high-level power to a load, and method of stopping a high power load from operating, are disclosed. The drive circuit includes a high power circuit capable of being...
US20080137239 Motor power device and motor including the same  
A motor power device includes a power circuit having a low voltage part that receives and converts AC power and outputs DC voltage, wherein a first power for a motor drive coil and a second power...
US20120140364 DRIVE FORCE DISTRIBUTION CONTROL APPARATUS  
A drive force distribution control apparatus in which if a relay output voltage (Vah) detected by relay-output-voltage detecting means (30) is lower than a first threshold, the relay is repeatedly...
US20050168891 Condition monitor for an electrical distribution device  
The invention is a condition monitor for a switchgear device in an electrical power distribution system. The switchgear device is arranged with an electrically powered actuator for operating a...

Matches 1 - 50 out of 58 1 2 >