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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/1994/018751A1 |
A method of detecting and regulating load is provided for controlling a servomotor to prevent continuous overload on a machine, when an abnormal load is detected. When a load torque Td2 detected by an observer exceeds a reference value T...
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WO/1994/000909A1 |
A reluctance motor and a brushless direct current motor capable of operating at a high efficiency, at a high speed and with a high torque. When one excitating coil or armature coil is deenergized, the magnetic energy accumulated in the m...
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WO/1993/026081A1 |
A vector controller of an induction motor connected with an inverter, which can be used not only on a power side but also on a regeneration side, comprises means for detecting the difference of sign between the rotor's electric angular v...
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WO/1993/023919A1 |
According to the invention, a numerically controlled electric motor driving system is provided including a control mechanism for energy recovery. The system includes a motor with an outer rare-earth metal made magnetic pole rotor (3) whi...
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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/1993/015550A1 |
A reluctance motor, which has a small diameter, a high rotating speed and a high efficiency, or which has a large output torque, little vibration and, if necessary, which can be regeneratively braked. The rotor of the reluctance motor is...
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WO/1993/013589A1 |
The present invention aims at providing a motor operation method capable of preventing demagnetization of an electric motor due to over-cooling in an ultralow-temperature environment, and an electric motor capable of withstanding the use...
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WO/1993/006643A1 |
In an electrical device, an electricity consumer (2) is powered by a battery (B) via an electronic switch (21). To indicate the state of charge of the battery there is a display (9) and a timer (5) ascertains the period for which the con...
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WO/1993/003531A1 |
A dynamic braking resistor (10) for stabilizing a power system (12) during power system disturbances includes a braking resistor (25) for coupling with a power system bus (16). A controller (40) monitors a power system parameter, such as...
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WO/1992/017935A1 |
An improved electrical circuit configuration for a chopper circuit is disclosed which is particularly adapted for use with an inductive load such as a braking resistor (38) of the type used in many rapid transit vehicles. Instead of conn...
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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/1992/008274A1 |
Described is a circuit for limiting the cut-off voltage which occurs when an actuator motor (M) is controlled by means of width-modulated d.c. pulses. The circuit comprises a power transistor (T2) which is turned on by a capacitor (C) fo...
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WO/1992/005626A1 |
An apparatus for controlling a series wound DC machines comprises an element (10) with a diode function connected in parallel with the field winding (6), a first switching element (2) connected between the field winding and one pole of t...
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WO/1991/018391A1 |
In order to reliably stop a disk (CD) independently from its size and mass moment of inertia, a first braking impulse (B1) slows down the disk (CD) until it stands still then accelerates it in the opposite direction. In the meantime, the...
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WO/1991/005299A1 |
A method of producing a drive in accordance with a predetermined law of motion, such as a cycloidal law, for a body linearly driven by an electric motor, according to which, during deceleration of the motor (10) to a stopped condition, a...
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WO/1991/003866A1 |
Several commutator motor designs are proposed which are capable of providing smooth and rapid short-circuit braking together with good commutation. These designs call firstly for the armature to be connected in the motor operation phase ...
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WO/1990/008947A1 |
An apparatus for detecting an abnormal temperature of a regenerative resistor which dissipates the regenerative energy of an electric motor. This apparatus has a heat conductive member (11) provided in contact with the surface of a regen...
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WO/1990/008996A2 |
In a preferred embodiment, a high-frequency, pulse-width-modulated, power-transistor, DC motor speed controller having current limiting in both drive and regenerative modes, essentially constant ramping rates regardless of whether or not...
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WO/1990/001828A1 |
There is described a method for retarding a short-circuit induction motor (1) which is driven from a controllabe a.c. inverter (4), the d.c. input of which is connected to a capacitor (6). When retarding the motor (1) the frequency of th...
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WO/1990/000832A1 |
A switched reluctance motor drive system (10) with phase windings (12) and commutator switches (21-23) is provided with a setting device (15) for operating the commutator switches (21-23). In a first condition the setting device (15) ope...
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WO/1989/012266A1 |
A device for properly detecting the generation of excessive positional deviation in a servo system for a wide range of rotational speed of a servo motor to correctly and quickly determine the overload condition of the servo motor. A cent...
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WO/1989/008942A1 |
A conventional three pole D.C. motor has a third brush (9) placed at an acute angle of 60 degrees to one of the normal brushes (6, 7) and positioned to contact the commutator plates (C1, C2, C3). A motor energizing circuit is normally of...
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WO/1989/008946A1 |
Process for position-stopping of a device (1) provided with a horizontal drum (5) rotated by an asynchronous electric motor (6), characterized in that it comprises means for signalling the position of the drum (5), means for interrupting...
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WO/1989/007165A1 |
In a known stopping process, the motor is brought to a standstill by repeated braking and then driven again until the main shaft of the sewing machine reaches a certain desired position. In the new process, the duration of the stopping p...
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WO/1989/006394A1 |
A spindle orientation controller couples a spindle motor (2) via coupling means (5) with a main spindle (4) which produces a signal (LS) indicating its approximate stop position and a signal (MS) indicating its definite stop position. Th...
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WO/1988/009584A1 |
A control system for an alternating current motor (40), such as an elevator hoisting induction motor, in response to failure of power supply (10), such as service interruption, phase open and so forth, performs in a first emergency contr...
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WO/1988/006817A1 |
A control system for an electric motor includes a detector associated with a regenerated power absorbing circuit for monitoring operation of the regenerated power absorbing circuit for detecting an abnormal condition thereof. The control...
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WO/1988/005225A1 |
A motor controller comprising a discharge circuit (7) which decreases the voltage regenerated by a motor (5) to a drive circuit (4) when an AC servo motor or the like is braked, a protection circuit (8) which protects the discharge circu...
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WO/1988/003337A1 |
To brake commutator motors (2) having an armature (3) and at least one split or continuous field coil (4, 5) independently of an outer energy supply, circuit elements have switching means (8) via which the armature (3) and the field coil...
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WO/1988/002950A1 |
An improved motor control for banknote handling apparatus (10). An improved stacker pusher motor arrangement (200) has a defined cycle of operation. The time it takes the stacker pusher motor (116) to complete a predetermined portion of ...
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WO/1988/001450A1 |
An apparatus for controlling an adjustable-speed alternating current motor coupled to drive an elevator cage. The apparatus includes a converter connected to a source of AC power for converting the AC power into DC power, an inverter con...
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WO/1988/000123A1 |
A method of controlling an injection motor in an injection molding machine having an overheat preventing function to reliably set the injection molding conditions in which the injection motor will not be overheated. When the injection mo...
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WO/1987/007790A1 |
A regeneration control system for a servo motor (9) of an automatic carrier car which is powered by a storage battery (7) and which effects regeneration control during deceleration. A feedback voltage from a tacho-generator (10) of the s...
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WO/1987/002501A1 |
A brake pulse generating circuit determines the direction of rotation of a capstan motor at the edges of signals FG1 and FG2 by using D-type flip-flops (21, 22, 23 and (24) and a NOR gate (25). A brake pulse f having a longer pulse width...
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WO/1986/004753A1 |
Method and device for braking an asynchronous motor by applying a direct current to the field windings. In order to achieve accurate supply time of the braking current the AC voltage appearing at the outer terminals (4, 6) of two mutuall...
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WO/1984/002813A1 |
Control system (28) for controlling the supply of power to a motor (12) having an armature (34) and a plugging diode (38) connected across the armature (34), including a circuit (14) for producing direction command signals, a circuit (98...
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WO/1984/002812A1 |
Control system (46) for controlling the supply of power to a motor (12) to produce plugging electrical braking and current limit control, including a circuit (60) for controlling the direction of energization of the motor (12), a circuit...
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WO/1984/000450A1 |
In an intermittent windshield wiper system in which the time between wiping cycles depends upon the degree of dryness of the windshield and upon the speed of the wiper blades on the downstroke of the wiping cycle toward the dwell positio...
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WO/1983/004349A1 |
An apparatus for processing the regenerative energy of an AC motor comprises a regeneration-detecting logic circuit (7) outputting a regeneration detection signal when it detects that a semiconductor switch for an AC motor drive is not c...
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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/1982/001840A1 |
A torch for gas welding in a narrow deep edge preparation under a shielding gas atmosphere comprises a current collecting mouthpiece (1) with an electrode (2) and a nozzle for feeding the shielding gas to the welding zone, that nozzle be...
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WO/1982/001450A1 |
A direct-current brake control circuit having a construction in which an electromagnetic brake solenoid (35) and a transistor (52) for controlling the current in the solenoid are connected in series with a direct-current source (8), and ...
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WO/1982/001104A1 |
Controllers for brush-type multiple windings electrical motor. There has been a lack of a reliably-operating, efficient controller for such brash-type machine. The invention provides for torque control of a multiple winding electrical mo...
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WO/1981/001920A1 |
Simple and economical device allowing the recovery of energy stored by the grid-leak inductances of the electrical machine connected to the thyratron inverter. According to the invention, the device comprises a transformer of which the p...
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WO/1980/002482A1 |
A propulsion system for an electrically driven traction vehicle includes a chopper (12), a d-c traction motor (11), and means (103, 132, M) effective when the system is operating in a motoring mode for connecting the chopper in series wi...
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WO/1980/001526A1 |
A digital logic control system for a battery-powered direct current motor having an armature (20) and a separately excited field (21). The operator-demanded speed and the actual motor speed are continuously compared to determine whether ...
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JP7480478B2 |
To provide a technique capable of easily releasing braking by a braking device during no braking of a motor.According to a motor controller for drive-controlling a motor provided with a braking device capable of braking an output shaft, ...
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JP7465637B2 |
A motor drive circuit for driving an electric motor includes a plurality of driver circuits, each one of the plurality of driver circuit comprising a high side transistor coupled to a low side transistor in a half bridge arrangement, whe...
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JP7464375B2 |
To stably keep an output mechanism at a target position and control it even when a DC motor is used in an electric actuator.A holding control unit 17B supplies a holding brake current for holding a rotational angle θpt of an output axis...
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