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WO/1996/028874A1 |
A self-starting controllable motor having a rotor mounted for rotation with a peripheral segmented portion formed of permanently magnetized material, a stator formed of laminated magnetized material having two legs surrounding the rotor,...
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WO/1996/028700A1 |
When a lock detecting means (17) detects a locked state of a DC motor (4) in a starting stage, a torque increasing means (18, 27, 29 or 31) immediately selects a starting sequence pattern of an output torque that is greater by one step, ...
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WO/1996/020528A1 |
A method and an apparatus for starting a synchronous machine having a rotor and a stator provided with windings. The rotor has an initial position relative to the stator. The method comprises the steps of (a) initialising a starting phas...
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WO/1996/015580A1 |
An electric starter/generator system for a turbine engine capable of transforming mechanical power from the turbine engine to electric power during a generate mode of operation and of transforming electric power from a low voltage dc sou...
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WO/1995/035594A1 |
A time sequence of electromotive force amplitudes (e ref) corresponding to a predetermined law for torque variation during transient operating conditions is stored. For this purpose, voltages (W1, W2, W3) applied to the motor (M) and the...
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WO/1995/035532A1 |
The invention relates to a circuit arrangement for decreasing the energy consumption and for protecting of a variable loaded asynchronous motor, which comprises a sensor stage sensing at least one electric parameter of the asynchronous m...
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WO/1995/028763A1 |
An induction motor the drive of which is controlled by switching Y-connected windings (C1, C2, and C3), comprising switching means (1, S1, and S2) which switch the windings (C1, C2, and C3) and a control means (2) which controls the mean...
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WO/1995/020265A1 |
An electrical apparatus comprises a bridge circuit (10) having a plurality of rectifier legs (12a-c) electrically connected in parallel. Each of the rectifier legs (12a-c) comprises a first and second rectifier (18a-c, 19a-c) coupled in ...
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WO/1995/014326A1 |
This device is for controlling a rotary machine having a movable part rotated by a motor. The device has a fail safe mechanism in which a signal of logical one representing that no motor current is flowing is outputted. The motor (2) rec...
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WO/1995/012918A1 |
The starting of multiple three-phase induction motors is controlled with a simple constitution. At the time of starting, a sequence controller (3) actuates a first electromagnetic relay FM1 for starting and the relay FM1 and the SCR of a...
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WO/1995/005703A1 |
A method for controlling a servomotor when reversing the direction of a feed shaft of a machine tool using said servomotor including the steps of estimating a friction torque by providing disturbance torque estimating means for estimatin...
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WO/1994/028617A1 |
An apparatus and method control the speed of an AC induction motor by varying the frequency and current to the motor from an inverter power supply. A Counter EMF regulator receives a reference signal corresponding to the desired speed, a...
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WO/1994/025386A1 |
A process for the electronic control of people conveyors in which the drive of the people conveyor is switched on and set to a predetermined stand-by speed via at least one frequency converter which is maintained until a monitoring devic...
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WO/1994/023490A1 |
A brushless repulsion motor (10) in which the rotor (17) carried electronic switch circuits (22) for selectively shorting the rotor windings (19) at appropriate times in its rotational cycle. A noncontact reference signal source (24) on ...
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WO/1994/019863A1 |
The invention relates to a process for controlling the revolution speed of a motor using an incremental detector so that the motor is to be simply controlled with lower starting torque and lower starting short-circuit current. To this en...
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WO/1994/008121A1 |
A revolving door lock (1) having outer walls (2-5) laterally defining a passage space comprises at least two revolving doors (10, 11) moving relatively synchronized, said revolving doors (10, 11) having two wings (26-29) rotatable about ...
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WO/1994/003965A1 |
The invention relates to a method of determining rotational speed, size and instantaneous direction of a residual flux of an inverter-supplied squirrel cage induction machine, to be used for starting the squirrel cage induction machine w...
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WO/1994/001919A1 |
A fault-tolerant reluctance motor has a multiphase stator winding. The stator (2) has a different number of poles from the rotor (5). The lead angle and the pole angle beta, betar) embraced by each stator and rotor pole (3, 5) is at leas...
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WO/1993/018576A1 |
A method and means for stopping the backspinning of a submersible pump motor prior to restarting the motor. A control circuit is provided which rectifies A.C. control voltage and applies the resulting D.C. voltage to an induction motor. ...
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WO/1993/012706A1 |
A dishwasher having spray arm, motor and pump components configured and mounted so as to occupy very low height. In one form the complete wash system is arranged as a drawer which slides in and out of a cabinet. The cabinet opening is st...
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WO/1993/011603A1 |
A starting control circuit (30) is provided for use with a mechanical duty single phase alternating current motor having a start winding (10) and a main or run winding (12). Both the main (12) and start (10) windings are electrically con...
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WO/1992/012570A1 |
Described is a circuit for influencing the start-up and/or braking behaviour of three-phase asynchronous motors whose phase windings (5, 6, 7) are connected up in a star configuration for continuous operation and which have terminals for...
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WO/1991/015053A2 |
An electronic switch supply unit contains a blocking oscillator with a transformer (5). The primary coil (51) of the transformer is connected in series with the collector-emitter section of a transistor (1) parallel with the input voltag...
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WO/1991/012651A1 |
A current converter (11) having an output connectable to a load (14) which has a starting current exceeding its normal operating current. The current converter also has an input connectable to a solar panel (12) and an energy storage dev...
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WO/1991/011052A1 |
A motor controller (10) for a single or multiphase induction motor (51) with control loop (59a, 59b, 59c) including auxiliary winding (61), capacitor (63) and saturable reactor (65). Auxiliary winding (61) is electro-magnetically coupled...
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WO/1991/010281A1 |
The invention relates to a method and to an arrangement for starting an electric machine having three or more phase circuits (phase 1 - phase 3) with varying reluctance, in dependence on the position of the machine rotor in relation to i...
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WO/1991/007005A1 |
A multiple-stator synchronous induction motor which is started as an ordinary induction motor and then switched into synchronous operation when the rotational speed becomes close to the synchronous speed. The motor includes a plurality o...
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WO/1990/008423A1 |
A motor (30) and manual actuated switch (26) includes a motor control circuit (10) for controlling the motor to rotate in either a clockwise or counterclockwise direction to actuate a mechanical switch between the open circuit and short ...
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WO/1990/006621A1 |
The problem of maintaining precision control of a synchronous motor (12) is solved in a motor start control (10) which utilizes an estimate of the amplitude of the fundamental wave component as a feedback value. The motor (12) receives p...
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WO/1990/006620A1 |
The problem of excess size and weight resulting from the use of current sensors in a VSCF start system is solved by a motor control system (10) which utilizes a current estimator (68) to develop a current feedback value. The current esti...
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WO/1990/006015A1 |
The problem of reducing the effect of inaccuracies in rotor position detection for an engine starting system is solved in an engine start control apparatus (10) operating a generator (12) as a synchronous motor which employs acceleration...
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WO/1989/007858A1 |
This invention relates to a motor output change-over control unit used for a main shaft operating motor of a machine tool. A conventional unit of this kind produces a wide range constant motor output by gears, and a main shaft operating ...
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WO/1989/006065A1 |
Low-speed revolution characteristics of a three-phase induction motor are improved by an inverter of the PWM system by quickly switching DELTA-Y connection using semiconductor switches (1, 2, 3, 4, 5), e.g., triacs.
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WO/1989/003936A1 |
A starting system and method for starting a prime mover (10) connected to a generator (15) by an actuable torque link (12) utilizes a hybrid permanent magnet/induction machine (17) having a rotor (34) coupled to a rotor of the main gener...
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WO/1989/001569A1 |
Prior starting/generating systems which operate a generator as a motor to start a prime mover have been inefficient since motive power was delivered to the prime mover through hydrostatic trim and differential components of a constant sp...
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WO/1988/006377A1 |
A field coil is split into a plurality of sections which are connected in parallel with the battery for starting and are connected in series for generating the power after the engine is started. Thus a sufficiently large field magnetomot...
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WO/1988/001111A1 |
A system for driving a constant current drive type DC motor, which enables the supply of a low power to switching element(s) in a constant current drive circuit therein during, and in particular, at a start-up of the motor. In the DC mot...
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WO/1987/002526A1 |
An improved switching control apparatus (1) for switching a number of alternating current (AC) devices (20), such as AC vend motors, uses a reduced number of AC power switching elements (10) such as relays by dividing the AC devices into...
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WO/1986/006185A1 |
An electric power controller controls a power-source voltage (Ein) with a thyristor (18), supplies the power to a plurality of devices (14), (16), and is equipped with means (28) which detects predetermined operation of a predetermined d...
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WO/1985/004060A1 |
A soft-start control (54) for use with a push-pull converter-regulator (10) having a flux balancing circuit (48). The push-pull converter (10) is responsive to a pulse with modulated waveform to provide a DC output, the converter having ...
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WO/1985/002886A1 |
A power conversion system for converting between electric and motive power may be utilized either in a generating mode to generate electric power from motive power supplied by a prime mover (24) or in a starting mode wherein motive power...
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WO/1984/004635A1 |
A MOSFET "H" switch circuit (30) for providing bidirectional control to a DC motor (32). The power MOSFET's (40, 42, 44, 46) employed have significant advantages over bipolar and darlington power transistors and allow for microcomputer i...
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WO/1984/004005A1 |
In order to minimise the initial in-rush current produced on first energisation of a polyphase induction motor (10), careful control is exercised over the firing of controlled switching means (11) connected in series with each of the sup...
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WO/1984/002404A1 |
Motor power-factor controllers (12) act, in the presence of varying motor loads, to maintain the phase lag angle (O/M) between motor voltage and current at a preset demand or reference phase-lag value (O/R) by regulating the firing angle...
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WO/1983/003928A1 |
Each phase conductor of the motor comprises n resistances (1, 2, 3, 4), wherein n is an integer. A control device (9) allows by means of switches (5, 6, 7, 8) to incorporate those resistances in series with the motor connected to the con...
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WO/1982/004165A1 |
Starting control circuit for an alternating current motor having a run winding (22) and a start winding (24) and a mechanical rotational output (26). The motor is powered by an alternating current source (30). A reference oscillator (32)...
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WO/1982/002127A1 |
A digital servo control system for a d.c. motor (20) to achieve stepping motor precision and a wider speed control range than either a conventional d.c. motor or a stepping motor, as may be typically utilized in an IV syring pump. Motor ...
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WO/1981/003586A1 |
A motor voltage control device for single-phase and for three-phase motors, for controlling the voltage supplied to the motor to thereby decrease power when the motor is less than fully loaded. The single-phase device (10) includes a sof...
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WO/1981/000651A1 |
Induction motors traditionally have a high breakaway torque to running torque ratio to prevent motor damage from excessive current as the motor slows down under a heavy load. Such design characteristic results in motor flux density being...
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WO/1980/002487A1 |
Voltage-to-frequency-converter, in response to primary variable analog input signal (Vc), generates one or more trains (C; F) of output pulses. For each train, its frequency vs. primary input signal characteristic is in three ranges or m...
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