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Patent Searching and Data


Matches 551 - 600 out of 13,506

Document Document Title
WO/1997/036367A1
The invention relates to ac series motors, in particular universal motors, which have a field magnet (16) with field pole arrangements each comprising two pole parts (8, 13), and the field magnet (16) is designed for a predetermined rota...  
WO/1997/032102A1
The invention concerns a variable drive with protection against jamming for movable parts, such as in particular windows and sliding roofs in motor vehicles. According to the invention, the number of revolutions or speed of the drive is ...  
WO/1997/029539A1
An electric brake circuit (10) for bringing an alternating current (AC) motor (12) to a rapid halt. When the AC motor is turned on, a braking capacitor (C1) is charged to a preselected voltage. A shunt regulator (18) prevents the braking...  
WO/1997/022175A1
The invention relates to a series motor (19) with an electrical brake and comprising an armature (20), provided with an armature winding (25), and comprising at least two field coils (22, 23), arranged on pole shoes (21, 24), and switchg...  
WO1997015872A3  
WO/1997/015872A2
A process is disclosed for monitoring the path of displacement of a part that can be moved by a drive towards at least one end position. At least one period of time that corresponds to a selectable number of rotations of a driving shaft ...  
WO/1997/011523A1
An electrical circuit for a switch having a lockout feature is described. The circuit permits both a primary operator and an auxiliary operator to operate a bi-directional motor (30) by activating separate low-current switches (SW1, SW2,...  
WO/1997/010512A1
A sensor capable of confirming the stop of revolution of a motor inclusive of rotation due to inertia. Signal input lines (A, B, C) are connected to three power feed lines (u, v, w) of an A.C. three-phase motor. A high frequency signal c...  
WO/1997/009769A1
Brake in an electric motor having a stator (10) and a rotor rotatably mounted in the stator, comprising a brake disc (12) on the rotor and at least one brake shoe which can be engaged with the brake disc (19). The stator is provided with...  
WO/1997/005691A1
A dynamic brake device having a simple circuit construction for a servo motor. A PWM control circuit (1) of this dynamic brake device generates a brake signal which simultaneously closes all switching devices of either a first group (TRa...  
WO/1996/034450A1
A method and a device for protecting regenerating resistor by which a regenerating resistor is sufficiently protected from thermal damage caused by excessive regeneration by using both a thermostat and an analog simulation circuit in coo...  
WO/1996/028883A1
A circuit for driving an electric motor (10) has a triac (24) connected in parallel to the electric motor (10). The triac (24) receives a first control signal (28) that depends from the voltage at a first terminal (11) of the electric mo...  
WO/1996/019857A1
The proposal is for a circuit for detecting an overload in an adjusting drive (10, 11, 12) operated by an electric motor (10) with provision for detecting the current flowing through said electric motor (10). A motor current evaluator (2...  
WO/1996/019858A1
The proposal is for a circuit and a process for operating an adjustement drive (10, 11, 12) which detect a characteristic (38, 42) of the adjusting drive (10, 11, 12) as a measure of the adjustment force or torque and prepare an overload...  
WO/1996/010223A1
A servomotor control system (100) assists in overcoming the problem of servomotor shut down during failure of a programmable control system (110) or of a servo amplifier (170). The servomotor control system (100) includes the programmabl...  
WO/1996/008066A1
The proposal is for a circuit for operating an electric motor (11) containing a monitoring device (24) for detecting increased load on the electric motor (11). The monitoring device (24) compares a difference in rotation speed (ND) betwe...  
WO/1996/008065A1
The proposal is for circuits for operating an electric motor (11) containing a monitoring device (25) for detecting overloads in the electric motor (11). In a first embodiment, the monitoring device (25) compares the motor voltage (UM) w...  
WO/1996/002443A1
A controller (42) for detecting abnormal operating conditions of a continuous motion machine (12) such as a packaging machine. The acceleration and velocity of each motor (14) for the various axes (16) of the machine (12) are examined by...  
WO1995024229A3  
WO/1995/024229A2
A medical infusion pump (10) including an improved electric motor assembly (256). The medical infusion pump (10) includes a pumping mechanism (250) and a pump chamber (132) in an operative position with respect to the pumping mechanism (...  
WO/1995/020839A1
The aim of the invention is to provide a simple method of stopping pump drives smoothly without chattering occurring. This is achieved by using an a.c. controller to increase the operating angle (D) between the motor current and motor vo...  
WO/1995/009478A1
In a braking circuit for a universal motor, the field coil or coils are connected in series to the armature during braking by means of a semiconductor switch, preferably a field effect transistor or a thyristor. As the semiconductor swit...  
WO/1995/009477A1
Proposed is an electric motor with an electrodynamic brake system in which the same power control stage is utilized both when using the motor and when braking. This enables the exciter current for the separately excited motor to be contr...  
WO/1995/008859A1
A drive assembly for a power operated door comprises a DC motor which is drivingly coupled to a torsion spring shaft assembly of the door. The motor is controlled by a control circuit which includes a current sensing device and a microco...  
WO/1995/002276A1
A motor braking circuit arrangement, for use with a series/universal motor and a power supply for supplying power to the motor, including two separately actuable switches electrically interconnecting a separate braking winding with the m...  
WO/1995/002268A1
In order to control the d.c. motor used to move a window in a motor vehicle, the current drawn by the motor is observed, the direction of movement of the window resulting from the direction of the current and when the window is closed th...  
WO/1995/001003A1
An induction motor controller of a power regenerative system which is constituted to quickly decelerate or stop an induction motor even in the event of a power failure. The controller comprises a power failure detection circuit (10) whic...  
WO/1994/027349A1
The proposal is for an electric motor drive with overload protection for the electric motor (10) which receives input (18) predetermining a reference position for a moving part. When the overload protection responds, the reference positi...  
WO/1994/027358A1
Before turning off a switching element (SW1, SW2, SW3, SW4, SW5, or SW6) at the time of switching the phase (R2, S2, and T2) of a power source to which a regenerated current is fed back, the switching element to be turned on next is turn...  
WO/1994/021027A1
The invention relates to an inverse speed motor, especially a universal motor, with a braking device and a stator having a field winding and a rotating armature powered via a commutator and brushes and a suitable circuit for switching th...  
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...  
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...  
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...  
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...  
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. ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
WO1990008996A3  
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...  
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 ...  
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...  
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...  
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...  

Matches 551 - 600 out of 13,506