1
John E Makaran: Control circuit for five-phase brushless DC motor. Siemens Electric, April 28, 1998: US05744921 (87 worldwide citation)

A control system (100) for a five-phase brushless DC motor (102) including a stator having five windings and a rotor (116) mounted for rotation relative to the windings (114). The windings (114) are adapted to be electronically commutated in response to the rotary position of the rotor (116). The co ...


2
John E Makaran: Positive supply lead reverse polarity protection circuit. Siemens VDO Automotive, August 26, 2003: US06611410 (15 worldwide citation)

A protection circuit for use in a power electronic circuit has a positive supply input, a negative supply input, and a snubber. The protection circuit includes a snubber bias lead, a positive voltage lead, a positive supply lead, a switch and a reverse polarity shut off circuit. The snubber bias lea ...


3
John E Makaran, Dragan Radavcovic: Multiple brush-type motor control apparatus and method. Siemens VDO Automotive, August 10, 2004: US06774587 (12 worldwide citation)

A motor circuit includes a first brush-type motor, a second brush-type motor, a switch, and a pulse width modulation circuit. The first brush-type motor has a first voltage connection and a second voltage connection, the second voltage connection adapted to be coupled to a source of DC voltage. The ...


4
John E Makaran, Dragan Radakiovic: Multiple electronically commutated motor control apparatus and method. Siemens VDO Automotive, October 26, 2004: US06809484 (10 worldwide citation)

A cooling system includes multiple cooling fans, each driven by a corresponding fan motor controller. Each fan motor controller includes electronic commutation circuitry that is responsive to a modulated signal to control the speed of the associated motor and fan. The controller for one motor includ ...


5
John E Makaran, Jerzy Muszynski: Stall or reduced-speed protection system for electric motor. Siemens Electric, October 7, 1997: US05675464 (9 worldwide citation)

A protection system for an electric motor is disclosed. The system is adapted for providing protection to the motor in the event of a stall or reduced-speed condition. The system includes a sensor providing a first signal representative of the speed of the motor, a detection circuit receiving the fi ...


6
John E Makaran, Andrew Lakerdas: Spread spectrum motor control circuit. Siemens Automotive, August 13, 2002: US06433507 (8 worldwide citation)

A motor control circuit for use in a motor circuit includes a varying duty cycle pulse width modulation circuit and a switch. The varying duty cycle pulse width modulation circuit is operable to generate a PWM signal having a varying duty cycle, wherein an average of said varying duty cycle correspo ...


7
John E Makaran: Electronic variable speed control of dual motor configuration. Siemens VDO Automotive, August 8, 2006: US07088062 (5 worldwide citation)

A dual motor configuration 10 includes a primary brushless motor 18 electronically controlled to be driven at various speeds throughout a range of motor speeds. A secondary brush motor 24 electronically controlled be driven at various speeds throughout a range of motor speeds. The secondary brush mo ...


8
John E Makaran: Dual motor arrangement and control method. Siemens Canada, July 24, 2007: US07248005 (5 worldwide citation)

A dual motor arrangement includes a first motor M1, a first MOSFET Q1 constructed and arranged to control operation of the first motor, a second motor M2, a second MOSFET Q2 constructed and arranged to control operation of the second motor, an RFI filter structure L1, C_RFI, a freewheeling circuit L ...


9
John E Makaran: Overload protection for DC motors. Siemens VDO Automotive, August 15, 2006: US07091685 (3 worldwide citation)

A closed-loop system 10 is provided for controlling a DC motor. The system includes a DC motor 12, a controller 18 associated with the motor and constructed and arranged to control operation of the motor, a voltage sensor 14 constructed and arranged to measure a voltage supplied to the motor, a spee ...


10
Andrew Lakerdas, Attila Simofi Ilyes, John E Makaran, Corneliu Dragoi, Peter A Kershaw, Martin Volkening: Flux modifier for a permanent magnet brush-type motor using wound field coils combined with permanent magnets. Siemens VDO Automotive, February 7, 2006: US06995490 (2 worldwide citation)

A stator and armature assembly 12 is provided for a permanent magnet DC motor. The assembly includes an armature 13 having a lamination core 14 and windings 15, and a stator structure 16 associated with the armature. The armature is constructed and arranged to rotate with respect to the stator struc ...