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Document Title |
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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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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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7952311 |
Method and apparatus for variation of a rated current
The invention relates to a method for variation of a rated current which is specific of a motor by providing a rated current basic value signal (2) depending on a rated current basic value of the...
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7928681 |
Disk apparatus capable of determining failure of spindle motor
A control portion instructs supply of an offset voltage while a disk remains stopped at the time of start. While the disk remains stopped at the time of start, a differential operational amplifier...
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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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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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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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7688557 |
Control apparatus for transmission mechanism, transmission, vehicle provided therewith, method of controlling the transmission mechanism, and method of estimating heat value of electric motor in the transmission mechanism
A motorcycle has a transmission including a transmission mechanism and an electronic control unit (ECU). The transmission mechanism includes a crankshaft as an input shaft, a driven shaft as an...
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7656625 |
Disc apparatus
A disc apparatus which can accurately judge whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc...
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7638961 |
Drive system and control method of the same
In response to a system-off instruction, the drive system control technique of the invention controls individual motors of an electric cooling water pump and an electric cooling fan to stop (step...
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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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7518837 |
Control device for soft starting and protecting overload of motor
A control device for soft starting and protecting overload of a motor in a power tool is disclosed. The control device comprises a power switch, a varistor, several diodes, several resistors,...
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7501785 |
Starting system for a single-phase induction motor
A starting system for a single-phase induction motor, comprising: a stator having a running coil (11) and a starting coil (12); a power source (F) which supplies current to said running coil (11)...
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7446491 |
Intelligent power management for actuators
A system and method is disclosed for intelligent power management of actuators such as those used in papermaking. Multiple power supply units are connected to a common power bus. The power bus is...
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7265954 |
Method for estimating DC motor coil temperature, DC motor control method and their devices
Resistance of the coil of a DC motor is calculated by using the motor current and the motor voltage, and the coil temperature is estimated by using the resistance-temperature characteristics of the...
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7245198 |
Motor start relay and an electric compressor using same
A motor start relay (100) comprises a positive temperature PTC thermistor, a PTC case 400 of heat resistant resin for receiving the PTC thermistor horizontally, first and second contact/terminals...
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7107957 |
Protected control apparatus
A control apparatus for protected switching of a load encompasses at least two switch units in series with a load, to permit delivery of energy to a load when each switch unit is switched on and to...
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7038895 |
Apparatus for detecting abnormality of relay
An abnormality detection apparatus, which reduces erroneous detection of an open abnormality of a relay, includes a microcomputer that activates the relay and determines whether the output voltage...
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7005827 |
Starting circuit for single-phase induction motor
A starting circuit for a single-phase induction motor includes a motor starting positive characteristic thermistor and a triac arranged in a series connection, and a triac control positive...
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6946967 |
Protective device for an electric motor with sensor and evaluation unit
A protective device includes a signal input intended for connection to a sensor, a signal output intended for connection to an evaluation unit, and an isolation element for galvanically separating...
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6590752 |
Electronic control device
An electronic control device has a power switch for driving and supplying an electrical drive for a fitting which is to be controlled. The invention provides for the power switch to be driven by an...
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6456034 |
Device for controlling the power supply of an electric starter motor of a motor vehicle and a starter unit containing such a device
In a device for controlling the power supply of the electric motor of a starter of a motor vehicle, and of an automobile in particular, a power switch is connected in series with the electric motor...
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6327124 |
Low current ground fault relay
A ground fault relay, especially useful to detect motor leakage currents due to insulation failure. The invention operates in two (2) modes. The first mode is a "look-ahead" mode where possible...
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6252752 |
Overload protection apparatus and a speed reducer having such an apparatus
A semiconductor switch is installed in a power supply line of a motor, and photocouplers, which constitute a switching control circuit for turning on and off the semiconductor switch, are...
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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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5867357 |
Dynamic protection circuit for a motor type load
An express down vehicle window lift motor drive system in which an overcurrent detection circuit (10) interprets the flow of electrical power to the lift motor when the motor current exceeds a...
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5847915 |
Static isolator
Static isolator for the DC supply circuit of a load (MO) in the event of a surge, consisting of a dipole intended to be inserted into the power circuit of the load and comprising means for...
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5796565 |
Apparatus and method for starting and protecting a three-phase motor
Apparatus for protecting and starting a three-phase motor uses the three-phase field rotation torque produced by three voltage coils, connected to a three-phase power supply, spaced 120 degrees...
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5719732 |
Overload protecting device
An overload protecting device which includes a comparator 11 to which an output voltage V10 in proportion to the current flowing through a motor 5 and a start detecting reference voltage E11 are...
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5675896 |
Portable electric working machine
A portable electric working machine of the present invention includes a motor case portion housing an electric motor, a working portion driven by the electric motor, a handle connected to the motor...
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5535082 |
Turn-on control circuit for electric devices
A turn-on control circuit having a comparator supplied with a turn-on voltage increasing gradually during the turn-on phase of a device for protection. When the control voltage reaches a...
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5491978 |
Electronically commutated motor for driving a compressor
A system which drives a compressor of a refrigeration system at one or more speeds. The system includes a motor having a stationary assembly and a rotatable assembly. The stationary assembly...
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5428493 |
Motor starting relay device having PTC thermistors
In a relay device, a first PTC thermistor has one end connected to a first external connecting terminal, and the other end connected to one end of a second PTC thermistor, the other end of which is...
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5418675 |
Protection system for AC generators
A circuit for protecting the ac generator and/or load of a diesel-engine generator set is provided. Included is a circuit for measuring indications of the current in each phase of the ac generator,...
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5339014 |
Apparatus for safety monitoring in protective arrangements with normal and enhanced safety of machinery performing multiple-axis rotations
In an apparatus for safety monitoring of protective arrangements with normal or enhanced safeguard for machinery performing multiple-axis rotations with shutoff contactors in the power supply...
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5337206 |
Three phase power monitor
A three-phase power monitor operates a contactor between a supply of three phase electrical power and a three phase load. A phase integrity detector has three inputs connected respectively to the...
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5260634 |
Constant current driving system for a stepper motor in rotating disk
In order to drive the stepper motor of a floppy disk drive with practically constant current in the face of fluctuations in supply voltage fed from a host system, a power control pulse generator...
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5189388 |
Oil well pump start-up alarm
A visual and audible alarm are connected to a control circuit for an oil well pumping unit. The control circuit includes a time clock which controls the intermittent ON-OFF cycle of operation of...
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4991049 |
Anti-short-cycle circuit
A protective time delay delay circuit delays energization to an electric load until a predetermined time has elapsed from a previous deenergization. A transistor has its emitter connected to an ac...
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4939909 |
Control apparatus for air conditioner
An air-conditioner comprises a refrigerating circuit having a compressor, a condenser, an expansion device and an evaporator which are connected by suitable refrigerant conduits. An electric...
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4933800 |
Motor overload detection with predetermined rotation reversal
An apparatus is provided for controlling an electric motor that is doing some sort of work, whereby the apparatus automatically senses the presence of a work overload. Once the work overload is...
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4933799 |
Highly efficient over current circuit breaker
A highly efficient over current circuit breaker for an electric system is provided with a timer which is adjustable and can be set to produce a first control signal a predetermined time after the...
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4906857 |
Electronic starting motor control having fail safe and overvoltage protection
An electronic starting motor control system for electric starting apparatus of a type that has a solenoid including a solenoid coil. Energization of the solenoid coil causes solenoid contacts to...
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4858053 |
Operational amplifier having an improved feedback system including an integrator having a hurry-up circuit, and an electric motor control using the same for inverse trip selection
A motor controller is adaptable to a wide range of motor currents by using an integrator circuit having an additional feedback arrangement for affecting the effective time constant of the...
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4772977 |
System for protection of electrical machines against damage from residual voltage effects
A system for use with electrical machines allows fast transfers to be made from one power source to another or fast reconnections to be made to a momentarily interrupted power source without...
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4722019 |
Protection methods and systems for refrigeration systems suitable for a variety of different models
Calibrated methods and systems for protecting refrigerant motor/compressors against overload and loss of refrigerant conditions, independent of compressor and system size, while avoiding the need...
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4722018 |
Blocked condenser airflow protection for refrigeration systems
Refrigeration system control systems and methods for protecting a refrigerant motor/compressor, for example in an air conditioner, against conditions of excessive loading. The systems and methods...
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4713717 |
Protected refrigerator compressor motor systems and motor protectors
A motor protector having a thermostat metal element thermally coupled to an electrical motor in a refrigerator compressor motor system has a heater responsive to motor current thermally coupled to...
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4713718 |
Microprocessor based motor protective relay with maximum number of starts per time interval limiter
A motor protection relay is provided which is programmable to limit the number of starts which are allowed in a given interval of time. In accordance with the algorithm associated with the relay...
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4710841 |
System for production of induction machines against damage from residual voltage effects
Protection of induction motors and generators is provided to allow rapid reclosure of the power supply or fast transfer from one power supply to an alternate supply. A switching sequence is...
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