Siemens Vdo Automotive Corporation

Siemens Canada Limited

Corneliu Dragoi

Attila Simofi-Ilyes

Andrew Lakerdas

Peter A Kershaw

John Edward Makaran

Martin Volkening

Stefan Zenon Smorowski

Dragan Radakovic

Rodney Vanwyck

A speed control and stall protection systemfor an electric DC brush motor includes a DC brush motor M. At least one relay Kis connected between the motor and a power supply. A speed sensing circuitis constructed and arranged to generate a signal indicative of a speed of the motor. A motor control and protection circuitis constructed and arranged to receive 1) the signal from the speed sensing circuit and 2) a control signal input for operating the at least one relay to control operation of the motor. When a stall condition is determined based on the signal from the speed sensing circuit, the motor control and protection circuit is constructed and arranged to control the at least one relay to disconnect power to the motor.

System and method for speed control and stall protection combination for electric motors such as in engine cooling applications

A stator and armature assemblyis provided for a permanent magnet DC motor. The assembly includes an armaturehaving a lamination coreand windings, and a stator structureassociated with the armature. The armature is constructed and arranged to rotate with respect to the stator structure. The stator structure includes at least one permanent magnetproviding a certain flux, and at least one wound core structurehaving a coreand a coilwound about the core so as to define an alternate pole with respect to the permanent magnet. When current to the coil is controlled, flux of the stator structurecan be increased or decreased relative to the certain flux. In this way a motor can operate at different speeds.

Flux modifier for a permanent magnet brush-type motor using wound field coils combined with permanent magnets

A method of detecting a rotor condition of a dc motor is provided. The motoris part of a motor control circuithaving a free-wheeling diodein parallel with the motor. The method establishes a threshold voltage for back emf voltage evaluation. The motor is energized to operate at a certain speed. Current is cut-off to the motor via a switchfor a time sufficient for current through the free-wheeling diode to decay to zero. The back emf voltage detected at leads of the motor is then compared via a comparatorto the threshold voltage.

Stall protection based on back EMF detection

A system and method for protecting a motor from a stall condition includes a brush motor having power brushes and that convey power to windings of the motor, and one sensing brush constructed and arranged to sense a speed of rotation of an armature motor. A controller is constructed and arranged to compare a sensed speed of rotation with a minimum speed value that is indicative of a stall condition. A relay is constructed and arranged to disconnect power to the motor if the sensed speed is below the minimum speed value.

Stall protection for brush motors with rotation sensing brush device

A jump bar shunt structure includes a base constructed and arranged to be mounted to a substrate and to function as a current shunt; a pair of first legs and integral with the base and being constructed and arranged to be connected between terminals of at least two power devices such as MOSFETs; and a pair of second legs and integral with the base and being constructed and arranged to be connected to a printed circuit board so as to define a current sensing connection. The jump bar shunt structure is a single component that carries high current between two or more power devices and converts current into voltage that is used by the current measurement circuitry. The advantage of the jump bar shunt structure is that no high current (motor current) flows through a control PCB.

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London, Canada

Corneliu Dragoi