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8133033 |
High voltage bus capacitor pre-charger circuit
A precharge circuit (20, 20′, 20″) charges at least one capacitor (22, 22′, 22″) associated with an electrical device with high capacitance, such as a motor (14) which drives a compressor (16) of...
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8037964 |
Electric power steering apparatus
When stopping operation of an electric power steering apparatus, a motor relay is kept in an on-state even after a power supply relay is in an off-state. A drive control portion sets a target value...
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7893647 |
Arrangement for driving a load element
In a method or system for driving a load element, a drive motor is provided on a drive shaft of the load element that establishes a drive rotation speed of the load element. A rotation torque...
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7755306 |
Electric power control device, electric powered vehicle including the same, and method for controlling electric power of electric vehicle
A load on a vehicle is connected to first and second neutral points in first and second motor generators through a relay circuit and power output lines. A control device controls inverters...
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7737649 |
Apparatus on a spinning room machine for monitoring an electric drive motor
An apparatus on a spinning room machine, especially a spinning preparation machine, is arranged for monitoring an electric drive motor, which is connected to an electronic speed-setting and/or...
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7518323 |
Motor driving device
A motor driving device is disclosed that includes a first drive circuit that drives a first electric motor and increases a rotational speed of the first electric motor according to an increase in a...
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7487023 |
Construction machine
In a hybrid construction machine, its display device displays, toward an operator, an artificial engine sound serving as load information according to a magnitude of a workload, instead of an...
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7479746 |
Power converter for an electric engine start system
An electric engine starting system includes a permanent magnet motor that is used to start the engine and then to generate power for powering a load while the engine is running. A disclosed system...
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7454985 |
Method and device for determining the hydraulic flow rate in a pump driven by a synchronous electric motor
The present invention relates to a method and relevant electronic device (10) for determining the hydraulic flow rate in a pump driven by a synchronous electric motor (12), said motor (12) being of...
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7308383 |
System and method for providing electrical system monitoring and diagnosis
A soft starter system for monitoring and diagnosing electrical power system characteristics includes a motor controller including solid state switches for controlling application of power to a...
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7199534 |
Electric jack stroke limit detection method and device
A method and device for detecting the stroke limit of an electric motor-driven jack while the jack is being used to adjust the attitude of a mobile platform. A controller is programmed to detect...
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7190146 |
Control system and method for an overhead bridge crane
Included herein is a system and method for controlling a velocity vector of an overhead crane. A motor is attached to the crane and is positioned to move the overhead crane and has an output vector...
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7123462 |
Load control device
A load control device having a power control element connected in series to a series circuit of a load and an alternating power supply and a snubber circuit comprises suppressing means for...
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7026771 |
Motor control apparatus and electric appliance using the same
A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed...
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6903526 |
Electronically commutated DC motor comprising a bridge circuit
An electronically commutated DC motor comprises a stator comprising at least one stator winding (22, 24, 26), a rotor (28) electromagnetically interacting with the stator, a positive and a negative...
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6838839 |
Electric circuit of electric vehicle
An electric vehicle includes a drive-motor driving device and a compressor-driving device for air-conditioning. Both of these driving devices share a smoothing capacitor and a radiator. The...
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6771036 |
Position control method and position control system for drive feed equipment
When driving a plurality of paralleled feed drive mechanisms individually by servo motors (105, 106), torque of the servo motors (105, 106) is detected, and in dependence on a difference...
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6577095 |
Brushless alternating current electric servo motor drive
AC servo motor drives which allow several AC drives to be connected in parallel and allow for the connection and reconnection of AC servo motors to be accomplished primarily through a central...
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6342768 |
Displacement apparatus arranged for guiding a carrying device along at least two rails
A displacement apparatus comprising a first rail and a second rail, extending substantially parallel thereto, while on the first rail a first driving gear with a first motor is provided and on the...
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6259222 |
Device and method for regulating maximum loading on an electric motor in an aggregate feed replenishing system
A device for controlling load on a first motor whose load is affected by a second motor, comprises a controller having a first input for being connected to a horsepower transducer connected to the...
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5942862 |
Power output apparatus and method of controlling the same
A power output apparatus (20) of the present invention includes a clutch motor (30), an assist motor (40), an engine (50), and a controller (80) for controlling the clutch motor (30) and the assist...
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5874813 |
Control method, especially for load balancing of a plurality of electromotor drives
A load-balancing method for a multiplicity of controlled drives, especially individual electric motors of the rolls of a leveling machine for metal strip, in which all of the motors have speed and...
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5625262 |
System for equalizing the load of a plurality of motors
A system having two or more A.C. motors driving the same load. The stator windings and rotors of both motors each conduct current having a vector representative of a magnitude and angular position...
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5384520 |
Balanced drive motors with cross-coupled excitation
Balanced-drive multiple motors each including an armature rotatably actuated by a field winding. Cross-coupled series excitation of the field windings is accomplished by electrically connecting the...
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5204591 |
Device for controlling at least one electronic servomotor with high power from a low-voltage network, in particular for motorizing a turret on a tank
Device for controlling at least one electric servomotor with high power from a low-voltage network, in particular for motorizing a turret on a tank, characterized in that it comprises, in...
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5004966 |
Computer activated reward dispensing machine
A machine is designed to be used as an educational tool. The machine is connected to a 120 volt alternating current source of electrical power and to a personal computer. The computer is programmed...
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4987351 |
Load-based control of an AC motor
An AC motor control based on an iterative computation of the motor load and method of accurately determining motor load. At the initiation of motor operation, the load term (%LOAD) is initialized...
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4983892 |
Mechanism for controlling electrically driven antenna
A control apparatus is placed in a drive circuit of a motor of an electrically driven antenna. The drive circuit is provided in parallel with a transmitter-receiver circuit of a...
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RE33314 |
Vending machine power switching apparatus
An improved vending machine power switching apparatus in which a single power switching circuit is associated with a plurality of load selecting relay switches and a switching control circuit, in...
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4885698 |
Overload prevention apparatus for jacking system of offshore structures
An overload prevention apparatus for a jacking system of a rack and pinion type for use in offshore structures is disclosed. Each of the pinions is provided with a torque meter and tachometer for...
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4822185 |
Driving method of a printing apparatus employing a non-stabilized power source
A driving method for a printing apparatus having a non-stabilized power source compensates for power supply fluctuations by selectively driving an additional load, such as another electric...
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4788476 |
Machine for lapping two curved-tooth bevel gears
A lapping machine for correcting the asymmetrical hardening distortions which occur during the hardening of gear wheels, especially bevel gears, is disclosed. This machine is particularly...
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4683786 |
Numerically controlled lathe
A numerically controlled turning machine comprises a main spindle (Hs) and at least two cross slides (K1,K2) each provided with a saddle (W1 and W2, respectively). Another saddle (W3) is provided...
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4559482 |
Automotive rim roll forming drive system
An electric drive system for automotive wheel rim forming equipment having inner and outer forming rolls mounted on driven spindles. The drive system includes separate drives for each forming roll...
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4556826 |
Inching supply torque control
In a drive system for a grinding mill the load torque plus frictional torque may increase considerably as a loaded mill is inched from its rest position and will suddenly decrease when the load...
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4511826 |
Control apparatus for metal saw cutter
A metal saw cutter has a first motor for rotating a workpiece to be cut and a second motor for rotating a metal saw independently of the first motor.A control apparatus of the metal saw cutter has...
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4496883 |
Electric inching impulse control
There is provided an electrical inching control for inching a drive system comprising a grinding mill driven by one or more three phase synchronous motors. The electric inching control includes an...
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4482848 |
Controllable power source
A controllable power source is suitable for driving one or more electric motors from a low voltage battery. A converter steps up the d.c. voltage to a higher level at which the motors are designed...
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4248054 |
Refrigeration system with load balancing control for at least three centrifugal compressors
An improved load balancing control circuit for at least three electric motor-driven centrifugal refrigerant compressors comprises a current transformer secondary 90', 91', 92' and a respective load...
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4208620 |
Plural electric motors driving common load and having interconnections for load control
A twin electric motor drive for a grinding mill has substantially identical synchronous motors mechanically connected to the drive of the mill, and the stator winding which generates a revolving...
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4157671 |
Drive for cutting rollers of paper shredding or cutting apparatus
A drive for paper shredding or cutting apparatus having two counter-rotating cutting rollers each carrying a plurality of cutting knives, the knives of each roller being in engagement. Each roller...
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4152902 |
Control for refrigeration compressors
A device for controlling a single variable capacity compressor, or multiple variable capacity compressors in either parallel flow or series flow chilling systems, senses temperature and load...
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4110668 |
Thyristor pulse controller for plural loads
A pulse controller for controlling the current supply to a plurality of d.c. loads through a respective main thyristor for each load is provided with digital circuitry operable to maintain the...
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4057228 |
Mixing of materials
Powderous, granular, and/or liquidous substances such as thermoplastic or elastomeric materials are mixed with each other or with fillers, additives, etc. in that the mixing operation is continued...
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4056759 |
Driving system for moving paths or escalators
A driving system for moving paths or escalators which use an endles chain adapted to be circulated between a path for transporting passengers, comprising a first and a second sprocket disposed at...
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4051675 |
Drives incorporating variable filling fluid couplings
A fluid coupling, of the kind in which the filling of its working circuit is determined by a movable trimming scoop, is driven by an electric motor. The coupling output drives a high-inertia load...
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4012674 |
Dual motor web material transport system
A ribbon drive and motor control system in which the instantaneous speed and torque output of a pair of motors are controlled interdependently to bidirectionally transfer ribbon or other web...
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3886417 |
Method and apparatus for controlling multiple suspension cranes
Four crane units support a load which it is desired to maintain in a horizontal position. The suspension point nearest the center of gravity is selected. An electric take-up motor controls the...
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3774092 |
DRIVE SYSTEM OF SYNCHRONOUS MOTOROS SHARING A COMMON LOAD
A drive comprising at least two electric synchronous motors coupled to a common load for driving it, and means for starting the motors and making them share the load. Each motor has a primary...
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3732034 |
CONTROL SYSTEM FOR COMPRESSORS OPERATING IN PARALLEL
Control apparatus for controlling the operation of a compressor station comprising at least two compressor plants connected to operate in parallel, includes means providing "raise" and "lower"...
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