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Patent Searching and Data


Matches 751 - 800 out of 22,569

Document Document Title
WO/1999/061920A1
The invention relates to a circuit for detecting the speed of electronically controlled electric motors (M), comprising means for detecting the current rates of rise (TPV, C, OP, D, R1, R2b, R2a, T2, R3b, R3a, T3, à, Rnb, Rna, Tn) and m...  
WO1999049487A3
The invention relates to a drive unit for switching circuit breakers, especially disconnecting and/or grounding switches of medium-voltage switchgear, on and off. Said unit comprises a reversible d.c. motor and a switching device which c...  
WO/1999/055566A1
The invention relates to a method and device which serves to control a pump of a brake system according to demand. To this end, a total control is firstly (t0) carried out for the time TAnstMax (t1-t0) of the pump motor after the pump ha...  
WO/1999/054991A1
A hybrid DC motor controller is provided for driving a DC motor. A switch is connected in series with the DC motor, and a capacitor is coupled in parallel with the DC motor and the switch. The speed of the DC motor is controlled by the c...  
WO/1999/054992A1
An excitation circuit (3) is disclosed for balancing the phase voltages in a two phase motor. The excitation circuit (3) includes a first switch (S1) and second switch (S2) and a port (15) for receiving a signal to drive the switches. Th...  
WO/1999/049487A2
The invention relates to a drive unit for switching circuit breakers, especially disconnecting and/or grounding switches of medium-voltage switchgear, on and off. Said unit comprises a reversible d.c. motor and a switching device which c...  
WO/1999/043078A1
The present invention relates to a method and a device for measuring the rotation speed of electronically switched fans (L), wherein said method comprises measuring the maximal rates of current increase in the current fluctuations genera...  
WO1999027640A3
Electrical direct current actuators are frequently used in electronic control and regulation devices. Said actuators have a distinct low-pass behavior with respect to the actuating signal. Typical examples for such actuators are electric...  
WO/1999/035734A1
A motor actuator (10) for preventing a motor (m) from drawing excess current for longer than a predetermined time delay period including dynamic brakes for simultaneously braking motor rotation when motor (m) operation is terminated for ...  
WO1998058825A3
A window wiper motor system (14) for an automotive vehicle includes an incremental wiper position detection device. A window wiper feedback pattern (231) is disposed on a stationary circuit board (207) mounted within a gear enclosure wit...  
WO/1999/029033A1
A timing generating circuit (4A) generates and outputs two signals which do not temporally overlap with each other. One of the signals is a PWM signal for driving a first MOSFET (10) serving as a switching element; the other is a pulse s...  
WO/1999/029032A1
Method for eliminating torque vibrations in a frequency converter controlled a.c. motor used in an elevator system. In the method, the torque vibrations are minimised on the basis of the characteristic frequency of the motor supply curre...  
WO/1999/027640A2
Electrical direct current actuators are frequently used in electronic control and regulation devices. Said actuators have a distinct low-pass behavior with respect to the actuating signal. Typical examples for such actuators are electric...  
WO/1999/027642A1
The invention relates to a control system for a commutator motor control which is operated by phase-fired control. Allocation of a first and second control device in a single operating state without transition makes it possible to obtain...  
WO/1999/019966A1
A multi-functional apparatus (41) employs an intermittent motion mechanism (103; 105; 107). An electromagnetic device selectively causes movement of the intermittent motion mechanism (103; 105; 107) thereby moving a mechanical device (45...  
WO/1999/017436A1
A motor control system is provided comprising an electrically charged battery, an electrical motor, a battery voltage sensor, a motor speed sensor, an armature voltage sensor, an armature current sensor, and a microprocessor. The magnitu...  
WO/1999/014847A1
The Variable Speed Universal Machine (VSUM) is an electrical, AC rotating machine assembly capable of operating as a motor or alternator. The VSUM, operating as a motor, uses a fixed or variable-frequency AC or DC power source to provide...  
WO/1999/014835A1
The present invention relates to a control system that uses an electric motor which can be controlled through a final stage. A control circuit including a micro-processor is associated to the final stage and provides a pulse-width modula...  
WO1998051552A3  
WO/1999/005780A1
The invention relates to a control circuit for a dc motor with clocked control, comprising an electrolytic capacitor connected in parallel and a freewheeling diode. The aim of the invention is to reduce noise radiation. To this end, an i...  
WO/1999/005763A1
The invention relates to a control circuit for a direct current motor with a reverse pole protection device, which is connected to the electric circuit of the electrolytic capacitor and the free-wheeling diode in order to reduce losses i...  
WO/1999/004484A1
The invention uses a small D.C. motor as a base the winding of which is designed to allow a high idle rate with a simultaneous high starting torque. Thus a motor with a characteristic speed curve (3) having a steep slope is provided. Thr...  
WO/1998/058825A2
A window wiper motor system (14) for an automotive vehicle includes an incremental wiper position detection device. A window wiper feedback pattern (231) is disposed on a stationary circuit board (207) mounted within a gear enclosure wit...  
WO/1998/058445A1
The invention relates to a method for controlling at least two electrical consumers in a single circuit arrangement with pulse width modulated signals. According to the invention, a supply current which flows during the pulse pause of sa...  
WO/1998/051552A2
The present invention pertains to the field of transportation and relates to electric actuators for vehicles which are supplied from a DC circuit. This invention may be used for electric actuators in electrical load-lifting devices such ...  
WO/1998/051002A1
An H-Bridge motor controller having a floating, electrically isolated high side FET driver design where the motor driver circuitry is electrically isolated from the logic circuitry. Back EMF generation during motor operation is minimized...  
WO/1998/048090A1
The invention concerns a drive unit for a shaft of a device working in synchrony with the shanks of a mechanical loom to form a leno selvage. The shaft (111) can be driven by a first electric motor (110) (drive motor) which is coupled to...  
WO/1998/040945A1
The invention relates to a method for electronic control of the movement of electrically actuated units, especially window lifters, sun-roofs or the like in motor vehicles, which are provided with a regulating device connected to a drive...  
WO/1998/038728A1
A relay circuit is provided for operating a bidirectional dc motor (12) including an H-bridge relay circuit having a first and a second relay (18, 20). The first relay is capable of operatively engaging a first contact at a first time pe...  
WO/1998/037493A1
A drive unit for electrically operated doors, windows, screening devices and the like, comprises a drive unit casing (5) containing a motion transfer member (4) in engagement with a reversible drive motor (1) with an associated motor con...  
WO/1998/029939A1
An adjustable speed control for use on a children's ride-on vehicle, where the speed control includes a switch assembly (32) interposed between battery (24) and motors (20, 22) of the vehicle. Switch assembly (32) is selectively operable...  
WO1998019388A3  
WO1998019387A3  
WO/1998/023967A1
The invention relates to a method for the continuous detection of a rotational speed of electric motors, in which the rotational speed is supplied, for regulation purposes, to a secondary unit of a motor vehicle, in particular to a servo...  
WO/1998/019388A2
A hot-air appliance comprises a fan motor (M) connected in series with a heating element (H1) to receive a.c. mains voltage (L, N). The speed of the motor (M) is controlled by periodically short-circuiting the motor (M) by means of an el...  
WO/1998/019387A2
A hot-air appliance comprises a fan motor (M) connected in series with a heating element (H1) to receive a.c. mains voltage (L, N). The alternating voltage across the motor (M) is rectified (D5, C) and serves to power additional electron...  
WO/1998/014788A1
The invention relates to an electrical circuit to detect load current for a clocked, controlled load having at least one inductive component associated to a free-wheeling circuit. The circuit comprises a shunt resistor whose voltage drop...  
WO/1998/006296A1
The invention concerns an electrical circuit (1) for an electric consumer, in particular for an electric hair-dryer, fan heater, or the like. The circuit (1) comprises two heating resistors (2, 6) which are disposed parallel with each ot...  
WO/1998/001941A1
A microprocessor based control system generates optimal field and armature currents for a separately excited DC motor. The current levels for the field and armature coils are set by feedback control. Armature and field current setpoints ...  
WO/1997/039523A1
A PWM controlled multiphase DC motor apparatus has a multiphase DC motor, a current sensor, and a PWM controller. The DC motor has multiple windings which turn on and off during commutation at a commutation frequency. The current sensor ...  
WO/1997/037118A1
The low cost speed governor is used to provide stable device speed over a wide range of selected reference speeds and loads. The speed governor includes a means for changing the pulse width of a pulsed reference signal as a function of t...  
WO/1997/032389A1
The driver comprises a H-bridge (1) and a control circuit (2). The H-bridge comprises four switches (41, 42, 43, 44). The control circuit (2) comprises a pulse modulator (50) to generate a pulse signal (Vpwm) responsive to an input signa...  
WO/1997/023946A1
A current supply device for an electric d.c. motor (21) of a drive system, mainly for reciprocating driving movements, especially with different drive rotation speeds and/or detection of the travel of the object driven thereby, especiall...  
WO/1997/023947A1
A device including a storage battery (2) with a standard voltage (VB) higher than the nominal voltage (VM) of the motor (1), and a step-down static converter (5) arranged between the storage battery (2) and the motor (1) for supplying a ...  
WO/1997/021268A1
The invention relates to a process for adjusting a real value (actual value) of a physical quantity to a preset value (ideal value) with the following steps: (a) the difference between the ideal value and the actual value (referred to be...  
WO/1997/018620A1
A digital motor control is described which is programmable and has dual digital phase with sliding proportionality such that the motor control adaptively alters a speed of a motor by both changing sign and altering motor speed proportion...  
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/1997/008817A1
A method for controlling the speed of a motor driven by an unregulated voltage supply is disclosed. The disclosed method comprises obtaining a ripple signal (VR) representative of the ripple component of the supply voltage, and modulatin...  
WO/1997/005716A1
A system for reducing Radio Frequency Interference (RFI) produced by motors which are powered by Pulse Width Modulation (PWM). It is believed that the PWM induces radiation at the PWM frequency and harmonics. The invention shields power ...  
WO/1997/003364A1
The invention pertains to a process and a circuit arrangement for determining the speed of a d.c. motor. The invention provides that in determining the speed (n), dependencies of pertinent motor data on the operating state of the d.c. mo...  

Matches 751 - 800 out of 22,569