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| Number | Title | Issue Date |
| 7402965 | DC common bus self-protection method and system A system and method in accordance with the present technique for protecting motor drives from damage due to misconfiguration while coupled to a common DC bus, comprises sensing electrical operating parameters of the motor drives, automatically determining whether ea... | 07/22/2008 |
| 7352141 | Device and method to monitor an apparatus An apparatus for monitoring and control of one or more electric motors, including a motor controller, equipped with a soft starter. The soft starter includes memory for storing operations and event data, as well as a human-machine interface for making the event info... | 04/01/2008 |
| 7294980 | Fan control system A fan control system. The system includes a plurality of fans, each having a control device. One of the fans is designated as a master fan and others are served as slave fans according to a specific designation method, wherein the control device of the master fan ac... | 11/13/2007 |
| 7248004 | Cooling fan, in particular for motor vehicles A radiator blower, in particular for motor vehicles, is indicated that comprises a plurality of individual fans (11, 12), each having an electrical drive motor (13, 14), and a plurality of switches (S1, S2, S3), each capable of bei... | 07/24/2007 |
| 7242105 | Electric engine start with two motors and single motor drive An electrical starter-generator system includes a first starter-generator and a second starter-generator. A single drive controls both the first starter-generator and the second starter-generator such that their electrical current and power inputs are minimized and ... | 07/10/2007 |
| 7208894 | Electric vehicle motor and control system with high efficiency regeneration The present invention is an electric vehicle power system that uses multiple permanent magnet motor/generators connected in series or parallel and multiple battery step switching. Motor, torque and speed are controlled by steps in series connection and then in paral... | 04/24/2007 |
| 7206176 | Circuit and method for protecting against overload of an electric motor The invention relates to a circuit (1) for protecting against overload of an electric motor (2), more particularly an electrically powered air blower for a vehicle, with the purpose of providing sufficient and appropriate protection even when several e... | 04/17/2007 |
| 7154237 | Unified power control method of double-ended inverter drive systems for hybrid vehicles A method of providing a unified power control of a motor including providing a first inverter system, a second inverter system, and a motor coupled therebetween; coupling the first inverter system coupled to a first energy source; coupling the second inverter system... | 12/26/2006 |
| 7135826 | Fan control system A fan control system. The system includes a plurality of fans, each having a control device. One of the fans is designated as a master fan and others are served as slave fans according to a specific designation method, wherein the control device of the master fan ac... | 11/14/2006 |
| 7038421 | Method and system for multiple servo motor control A system for control of a plurality of motors comprising: an inverter including at least three legs, with each leg including two series switching devices configured to receive a command from a controller. The system also includes a first motor operably connected to ... | 05/02/2006 |
| 7032696 | Electric vehicle A method for carrying out a boosting operation includes detecting that a boosting operation has been carried out for making a current value of an electric motor larger than a normal full open throttle value, detecting that an electric motor has not rotated, detectin... | 04/25/2006 |
| 7023169 | Method for changing speed of motor group A method for changing the speed of a motor group, in particular for starting or stopping it, the motor group comprising a plurality of squirrel-cage induction motors or synchronous motors and network converters arranged for their control, when the nominal supply pow... | 04/04/2006 |
| 6933698 | Method of driving a servo motor with a built-in drive circuit Disclosed is a method of driving a servo motor with a built-in drive circuit in which a common rectifying circuit is provided on a distribution board to which a plurality of the servo motors with built-in drive circuits are connected, to thereby achieve a reduction ... | 08/23/2005 |
| 6927549 | Electric motor control unit An electric motor control unit mounted in an automotive vehicle having a motor that is variable in its rotational speed. A temperature sensing element is arranged to contact a busbar so that relays permit switching operation in response to detection of abnormal heat... | 08/09/2005 |
| 6914855 | Circuit for driving motor coils in stepping motors A circuit for selectively driving n motor coils associated with a plurality of stepping motors, wherein only (n+1) motor coil drivers are needed. A timepiece that utilizes such a circuit is also provided. ... | 07/05/2005 |
| 6897627 | Control device for dual-motor wiper systems An electronic triggering device for a two-motor wiper system with two electric motors is proposed, in which the triggering device includes a parallel circuit of three half bridges; one of the three half bridges intended for triggering both electric motors in common.... | 05/24/2005 |
| 6856106 | H-bridge apparatus and method An apparatus has a first H-bridge having a first motor contact on a shared first side and a second motor contact on a second side. The apparatus also has a half H-bridge having a third motor contact on a third side, wherein the shared first side of the first H-bridg... | 02/15/2005 |
| 6814546 | Multifan-equipped apparatus for cooling objects mounted at local interior regions and provided with fan-unit assembly and operation monitoring means having an error detector A multifan-equipped apparatus in which a plurality of objects mounted are controllably cooled by blowing air using a fan-unit assembly composed of a plurality of fan units. The plural fan units are divided into a plurality of groups; the fan units in the same group ... | 11/09/2004 |
| 6812657 | Motor control for two motors A load in an electrical apparatus is driven by two motors M1, M2. Switching means (R1, R2) switches the motors M1, M2 between: a series configuration, in which the motors M1, M2 are connected in series across a... | 11/02/2004 |
| 6653810 | Motor control system A motor controller circuit for controlling an electric motor in response to motor commands from a host controller. The controller circuit includes a motor driver circuit for providing motor driver signals to the motor in response to motor driver commands.... | 11/25/2003 |
| 6614194 | Motor fan control apparatus Two motor fans are driven by two 4-pole direct current motors, respectively. Rotational speed of the two motors is controlled in three stages, namely low speed, intermediate speed and high speed. Specifically, at the time of low speed operation the two mo... | 09/02/2003 |
| 6522096 | Control circuit for a robot power supply A mechanism controller for controlling power to motors of a mechanism having several motors, such as a robot. Each motor has a resolver for indicating the motor position. A driver unit is associated with each motor to supply power to the motor. Each drive... | 02/18/2003 |
| 6404151 | Electric vehicle drive An electric vehicle drive has an electric machine which can be alternatively driven as a motor or as a generator and has a d.c. connection to which a supply voltage can be applied, from a first energy source and/or a second energy source. The first energy... | 06/11/2002 |
| 6404150 | Accessory motor drive power supply system for an electric vehicle An electric vehicle accessory motor drive power supply system (40) that utilizes a single power supply design to provide efficient variable speed motor control to both brushless and brush-type DC motors (42,44). The power supply system includes at least o... | 06/11/2002 |
| 6281645 | Motor control system and image forming apparatus using the same A motor control system includes a processor having a clock output terminal for outputting clock pulses in desired cycles, a plurality of motors, and a plurality of motor drivers which are provided one for each motor and drive the corresponding motors on t... | 08/28/2001 |
| 6028404 | Motor drive circuit system utilizing multiple DC power driving devices switchable between parallel, and series/parallel combinations At least two components that use DC power to drive at least two motors, such as DC armatures, field windings, etc., collectively referred to as DC driving devices, are connected together by switching components which can be operated to selectively connect... | 02/22/2000 |
| 5136222 | Controller for automated apparatus, and method of controlling said apparatus A controller for an automated apparatus includes a plurality of operating units which operate independently while cooperating with one another, each operating unit driving a plurality of input/output elements. The controller includes a program control dev... | 08/04/1992 |
| 4841202 | Speed-limited electrically compensated constant speed drive An electrically compensated constant speed drive which is speed limited so that power flow through the speed compensation link is unidirectional includes a permanent magnet generator which is interconnected with a permanent magnet motor by a power convert... | 06/20/1989 |
| 4697124 | Integral series parallel and power brake controller for a transit vehicle An integral series parallel changeover and power dynamic brake controller apparatus for a transit vehicle disclosed. The controller utilizes a single cam shaft to operate switches for the series parallel function and the power brake function. The apparatu... | 09/29/1987 |
| 4695776 | Power converter for an electrically-compensated constant speed drive An electrically-compensated constant speed drive according to the present invention includes a speed summer having first and second input shafts and an output shaft at which constant speed motive power is developed wherein the first input shaft is coupled... | 09/22/1987 |
| 4638222 | DC motor driving circuit for eliminating spurious transition conditions In a DC motor driving device, upon detection of a change in the content of an input digital signal, supply of signals to switch elements from the output terminals of the decoder is suspended for a predetermined period of time following the detection of th... | 01/20/1987 |
| 4634942 | Apparatus for controlling electric cars Apparatus for controlling d-c shunt motors of electric cars utilizes first chopper circuits connected in series with the armatures of the d-c motors for controlling armature currents upon receipt of a first set of control signals and second chopper circui... | 01/06/1987 |
| 4549119 | Control system and method for operating mining machine traction motors and the like Method and apparatus for controlling DC traction motors on opposite sides of a vehicle, particularly a mining machine, by means of an SCR converter. The motors are accelerated while controlling the firing angles of the SCR's such that the current and volt... | 10/22/1985 |
| 4532458 | Variable-speed electrical machines An arrangement to provide variation of the speed or other operating parameters of an electrical machine without connection to the rotor. The machine is of the induction type having a winding in separate parts to create a flux movable in the air-gap differ... | 07/30/1985 |
| 4492907 | Combined series and parallel servo control for aircraft A flight control system increases the automatic control authority over, preferably, a helicopter yaw axis. A limited authority series servo is complemented with a full authority parallel servo. The parallel servo is driven by a combination of a trim comma... | 01/08/1985 |
| 4453111 | Electric drive for submarines A direct current electric motor marine propulsion system is provided with a pair of shunt wound direct current electric motors which are alternatively connected in a series/parallel circuit configuration. A forward biased diode between the motors in the s... | 06/05/1984 |
| 4309642 | Device for feeding a wire electrode Device for feeding a consumable wire electrode. Two feeding units are mounted in tandem. Each of the feeding units is provided with a pair of rolls and coupled to a direct current motor driving one of the rolls in the pair. The two motors are connected in... | 01/05/1982 |
| 4288727 | Modular motor and control means and method An arrangement of electric motors which are coupled together both mechanically and electrically comprises series pass elements and current sensing devices in the power circuits of the respective motors, each current sensing device having an output voltage... | 09/08/1981 |
| 4251757 | Power control system and apparatus thereof Power control system comprising an intermittent device for applying intermittent voltage between intermittent voltage terminals; the intermittent device having a DC input terminal and at least one pair of intermittent terminals; a plurality of pairs of re... | 02/17/1981 |
| 4208620 | Plural electric motors driving common load and having interconnections for load control A twin electric motor drive for a grinding mill has substantially identical synchronous motors mechanically connected to the drive of the mill, and the stator winding which generates a revolving magnetic field in each motor comprises a plurality of phase ... | 06/17/1980 |
