Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 7378810 | Method and apparatus for spindle motor control Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of dif... | 05/27/2008 |
| 7369757 | Systems and methods for regulating power in a medical device A system for controlling a motor for use in a ventilation system may include a motor, a voltage adjustment system, a user interface, and a motor controller. The voltage adjustment system may be configured to adjust a voltage applied to the motor. The user interface ... | 05/06/2008 |
| 7352144 | Motor driving device having MOSFET, MOSFET, and motor having MOSFET Each connection point of three series circuits formed by connecting two MOSFETs in series between positive and negative terminals of a direct-current power source is connected to a driving coil of a motor. The MOSFET is composed of an FET main body, and a parasitic ... | 04/01/2008 |
| 7340158 | Method and circuit configuration for controlling a polyphase brushless electric motor A method is specified for controlling a polyphase brushless electric motor, wherein the motor phase currents which are associated with the phases are produced by clocked variation of the respectively applied electrical potential. In this case, the motor phase curren... | 03/04/2008 |
| 7312550 | Architecture for electric machine In one aspect, an alternator is described which includes a current control apparatus including a stator winding and a control winding, wherein current control in the control winding regulates the stator winding. In another aspect, a gas turbine engine includes a mul... | 12/25/2007 |
| 7288923 | Voltage-limited electric machine An electric alternator having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits around different portions of the winding which may be configured relative to one another... | 10/30/2007 |
| 7283733 | System and method for regulating a load by utilizing pulse width modulation The invention is directed to a system and method for regulating a load (such as a CPU). A pulse-width-modulation (PWM) regulator calculates the duty cycle of the control pulse from a PWM controller, and then compares the duty cycle to a predetermined threshold. Ther... | 10/16/2007 |
| 7274865 | General purpose 100% solid state drive for direct current rotary machines General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as mo... | 09/25/2007 |
| 7272303 | Method and control circuit for driving an electric motor of a seatbelt retractor An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are provided each of which has a trigger input and a control signal outp... | 09/18/2007 |
| 7262539 | Saturation control of electric machine The invention includes an electric alternator/motor having a rotor, stator and at least one winding in the stator adapted to conduct a current, the machine also having and first and second magnetic circuits, one of which includes a saturable portion in which saturat... | 08/28/2007 |
| 7259492 | Rotor axial activation modulation of electric machinery due to reverse torque The invention involves installation of a helical nut structure, or a helical nut and ball or roller bearing structure, between an electric machinery transmission shaft and a driven transmission element. Depending on the torque between the electric machinery rotor, a... | 08/21/2007 |
| 7230400 | Electronically commutated motor In an electronically commutated motor (M), rotor position signals are generated by means of a galvanomagnetic rotor position sensor (40). A timer (CNT_HL) brings about an advanced commutation which occurs only once the motor has reached a specific rotation sp... | 06/12/2007 |
| 7230399 | Vehicular generator-motor system A vehicular generator-motor 1 is composed of a rotor, a stator having three phase armature winding 2, and a converter 4. The rotor is provided with a field winding 3 for magnetizing a plurality of magnetic pole pieces 14a... | 06/12/2007 |
| 7196485 | Universal low-power ceiling fan controller A universal low-power ceiling fan controller includes a brushless DC motor in a ceiling fan casing, a microprocessor connected to a power supply that operates with a remote-control device and has a transmitter and a receiver for transmitting data signals to the micr... | 03/27/2007 |
| 7187853 | Speed control of a d.c. motor The invention relates to a circuit and a method for the speed control of a d.c. motor, particularly the speed control of a fan driven by this d.c. motor, which is used as part of an air distribution system in passenger and commercial motor vehicles. The circuit for ... | 03/06/2007 |
| 7133603 | Motor driving apparatus, digital camera, and motor controlling method A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a moto... | 11/07/2006 |
| 7126313 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 10/24/2006 |
| 7062159 | Device for correcting a digital estimate of an electric signal A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signa... | 06/13/2006 |
| 7038412 | Device with an electromotor An arrangement having an electric motor (10) has a microcontroller (12) for influencing at least one motor function and a nonvolatile storage element (14) for storing at least one variable as a definition for that motor function. The arrangement... | 05/02/2006 |
| 6965183 | Architecture for electric machine The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be us... | 11/15/2005 |
| 6956340 | Method for processing data for an electronically commutated motor and motor for carrying out said method The invention relates to a computer-controlled electronically commutated motor (ECM) and to an improved method for processing data therein. The computer's program executes the steps of: a) defining, in recurrent steps, the rotor position region in which a current pu... | 10/18/2005 |
| 6949906 | Driving circuit and method for preventing voltage surges on supply lines while driving a DC motor A driving circuit of a DC motor includes a control circuit for providing a control signal, and a motor drive circuit commanded by the control circuit for providing respective command signals for the switches of an output power stage connected to the DC motor. The ou... | 09/27/2005 |
| 6934468 | Brushless DC motor and circuit for controlling the same Disclosed is a multiphase brushless DC motor of a concentrated winding type having shunt connection, and a control circuit. The brushless DC motor includes a rotor made up of a permanent magnet with M number of poles, and a stator operating in K number of phases by ... | 08/23/2005 |
| 6696811 | Method for regulating an electrical machine by means of a pulse-width modulation inverter The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can ... | 02/24/2004 |
| 6674962 | Limited-pool random frequency for DC brush motor low frequency PWM speed control A motor control system 10 includes an engine cooling module 14 including a DC motor 12. The system includes a switch 18 constructed and arranged to be controlled by a pulse width modulated (PWM) signal 26. The switch 18 is operatively associated with the ... | 01/06/2004 |
| 6633144 | System and method for measuring parameters of a DC motor field A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing ... | 10/14/2003 |
| 6611116 | Anti-spin control for a separately excited motor drive system Methods and apparatus for controlling performance of electric motors in a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field c... | 08/26/2003 |
| 6580874 | Field current control method in motor In separately excited DC brush motors ML and MR, an armature current control circuit for feeding power to armatures 61 and a field current control circuit for feeding power to a field system 62 form separate systems and are independently controllable exce... | 06/17/2003 |
| 6408130 | Electric drive system with an electronically commuted DC motor in order to reduce torque irregularities The invention relates to an electric drive device with a DC motor (2) comprising a control circuit with an electronic commutator (3). The invention is characterized in that a derivation of a control signal (V_i_ref) is obtained from an induced motor volta... | 06/18/2002 |
| 5929582 | Direct current electrical motor system and method of using same The DC electrical motor system includes a motor having an armature DC transducer coupled to an armature current controller by a sensor/detector arrangement to control the armature current. A field DC transducer coupled to a field current controller by ano... | 07/27/1999 |
| 5814958 | Method and apparatus for the electronic control of electric motor driven golf car A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse ... | 09/29/1998 |
| 5796225 | Electric vehicle power control system The present invention utilizes batteries in series addition and through controlled switching maintains current and voltage more constant as the batteries power a consuming device. The invention is described in its application to an electric motor powered ... | 08/18/1998 |
| 5793175 | Performance event sensing for control of electric motor driven golf car A system is provided for controlling a D-C motor which is constructed to propel a golf car. The motor is controlled to provide performance according to a predetermined field current map which calls for a particular performance response to specified perfor... | 08/11/1998 |
| 5757161 | Apparatus and method for limiting the speed of an electric motor A motor control apparatus for detecting motor overspeed in an electric car to prevent destruction of the motor and assure the safety of the vehicle. Torque control is applied when the motor speed is less than a specified rotational velocity. When the moto... | 05/26/1998 |
| 5642023 | Method and apparatus for the electronic control of electric motor driven golf car A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse ... | 06/24/1997 |
| 5590235 | DC motor control with periodic reset An electric motor (10) particularly a low-voltage collectorless dc motor, has a microprocessor (18, 40) with a reset input (24). Further, it has a device (26) which, during the running of the motor, generates signals (R) which depend upon the rotational p... | 12/31/1996 |
| 5574341 | Compound motor limiting control circuit for controllable shunt field winding by means A control circuit for controlling the excitation current in a compound motor includes a limiting switch connected in series with the shunt field winding of the compound motor. The limiting switch is closed whenever either the speed of the motor is excessi... | 11/12/1996 |
| 5483615 | Direct current electrical motor system and method of using same A direct current (DC) electrical motor system includes a DC electrical motor having energy conversion armature windings conducting a first electric current, and an electromagnetic field windings conducting a second electric current. The system also includ... | 01/09/1996 |
| 5455884 | Stepped compound voltage control circuit of battery in combination with field-control DC motor driving circuit A multiple output stepped compound voltage supply includes a field intensity control which enables a DC motor control circuit to provide continuous linear or pulse modulation control among the stepped voltages in relation to the voltage output.... | 10/03/1995 |
| 5392378 | Speed controlling system and a predictor A predictor (20) and a learning device (20) are newly provided to a conventional speed controlling system for a rotating body, according to the present invention. The predictor predicts an instantaneous speed error on the basis of a plurality of speed err... | 02/21/1995 |
