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 |
| 7786687 | Apparatus and method for control of an active front steering (AFS) system A motor control strategy for a motor in a front steering system for a vehicle that reduces vibrations from the motor being transferred to a vehicle hand-wheel. The control strategy also includes operating the electric motor in a commutation freeze mode if a position... | 08/31/2010 |
| 7781994 | Method and circuit for regulating the speed of a commutator series-wound motor The invention relates to a method and a circuit for regulating the speed of a commutator series-wound motor, especially a universal motor (10), which is supplied with a current from an a.c. voltage source (22) by means of a semiconductor switching elem... | 08/24/2010 |
| 7589483 | Motor control A washing machine and a method of operating same is disclosed. A electronically commutated motor for using in a washing machine is also disclosed. The washing machine has an agitator operated by an electronically commutated motor. An agitate cycle of the washing mac... | 09/15/2009 |
| 7518324 | Universal motor speed controller Moderately accurate closed loop speed control of a universal motor is attained without the need for any type of speed sensor. Motor armature (across the brushes) voltage is sensed and supplied to a control circuit for processing along with sensed motor current and z... | 04/14/2009 |
| 7342372 | Method for power control of an electric motor The invention relates to a method for power control of an electric motor, in particular a motor for driving the suction fan of a vacuum cleaner connected to an AC mains power supply. The power control is effected by varying the phase angle of the electric alternatin... | 03/11/2008 |
| 7330004 | Method and apparatus for quiet variable motor speed control An apparatus for controlling the speed of an AC motor comprising a switch adapted to be coupled in parallel with power terminals for the AC motor; a capacitor coupled in series with the parallel combination of the switch and the motor; the capacitor adapted to provi... | 02/12/2008 |
| 7323839 | Direct current motor controlling method A direct current motor controlling method includes a mean for transforming a duty signal to computed value by a microprocessor unit. The microprocessor unit computes the computed value and then produces a target value by executing a dichotomy method, a rotation meth... | 01/29/2008 |
| 7323845 | Apparatus for controlling operation of compressor and method therefore Provided is an apparatus for controlling an operation of a compressor which can always apply a constant voltage to the compressor without noise and a method therefor. The apparatus for controlling the operation of the compressor includes: a triac electrically connec... | 01/29/2008 |
| 7319282 | Switch circuit A switch circuit for controlling the supply of electrical power from an electrical power source to a load includes a power supply switch comprising input, output and control terminals. The circuit further includes an electronic switching device connected to the cont... | 01/15/2008 |
| 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 |
| 7274866 | Power tool and method for controlling a power tool A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the controller, and a speed sensor for monitoring the speed of the motor to generat... | 09/25/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7218071 | Method and apparatus for increasing AC motor torque output at low frequency Methods and apparatus are provided for controlling AC motor torque output. The method comprises the steps of producing a current based on a first comparison of a fundamental output frequency of the AC motor with a predetermined frequency and a second comparison of a... | 05/15/2007 |
| 7190129 | System and method for drift compensation when using pulse count controlled motors A system of detecting position drift in the motor due to lost pulses. Due to imperfections in the motor, the timing of the commutation pulses is not uniform but forms a unique repeatable signature. The system identifies lost pulses by using a pattern recognition tec... | 03/13/2007 |
| 7190091 | Selectable source input power supply A selectable source input power supply is disclosed. According to one embodiment, a power supply is provided comprising an input stage including an input connector to couple the power supply to either of an AC input voltage or a DC input voltage, and an actuatable i... | 03/13/2007 |
| 7183734 | Sensorless control of two-phase brushless DC motor A motor control system for a two-phase brushless DC motor uses measured EMF voltage from the passive set of stator coils to control commutation. A microcontroller receives the EMF voltage measurement and compares it to a threshold voltage value, which may be speed-d... | 02/27/2007 |
| 7174973 | Power tool interface This interface is an apparatus for controlling a power supply delivering power to a DC powered tool. The interface is connected between the DC power supply and the DC tool wherein the interface is configured to read signals from the tool and control the power suppli... | 02/13/2007 |
| 7145302 | Method and apparatus for driving a brushless direct current motor A method for driving a DC motor includes generating a first voltage pulse, based on a pre-determined speed input and duty cycle, and configured to generate motor current of reference current value sufficient to achieve a desired speed according to the speed input. S... | 12/05/2006 |
| 7145308 | Floating armature electric motor and method of assembly An apparatus for converting electrical energy into mechanical energy includes a plurality of iron segments disposed in a circular, generally donut-shaped body that is substantially non-magnetic, and which forms a rotor of an electric motor. Each of a first plurality... | 12/05/2006 |
| 7141944 | Device and method for controlling an electrical motor mounted on the crossarm of a bridge circuit Device for controling an electrical motor mounted on the crossarm of a bridge circuit whose motor current is controllable with semiconductor components formed in a first bridge branch by an electromagnetic switching device and in a second bridge branch by two serial... | 11/28/2006 |
| 7138776 | Method and apparatus for controlling brushless DC motors in implantable medical devices Methods and apparatus for controlling a polyphase motor in implantable medical device applications are provided. In one embodiment, the polyphase motor is a brushless DC motor. The back emf of a selected phase of the motor is sampled while a drive voltage of the sel... | 11/21/2006 |
| 7132808 | Solid state series motor control A solid state series motor control includes first and second FORWARD DRIVE elements, first and second REVERSE DRIVE elements, first and second diodes, a current sensor, and a capacitance. The series motor control is conf... | 11/07/2006 |
| 7129657 | Single track brush-based position encoder for rotating shaft A position sensor generates a signal representative of the angular position and, if desired, angular velocity of a rotating object using only a single circular track and plural brushes that ride on the track when the object rotates. The single circular track can hav... | 10/31/2006 |
| 7088066 | Automatic output power limiting electrical device An eletrical device derives power from an incoming power source to produce output plower to drive the device. The device includes circuitry that determines at lehst one characteristic of the incoming power source, and adjusts the output power used to drive the devic... | 08/08/2006 |
| 7084590 | Booster and motor controller A voltage sensor (101) is connected to output terminals (P, N) of a booster. The voltage sensor (101) detects a boosted voltage, and outputs the detected voltage to a first drive controller (102). The first drive controller (102) outputs ... | 08/01/2006 |
| 7081734 | Ride-through method and system for HVACandR chillers A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An inductio... | 07/25/2006 |
| 7065435 | Control system for controlling the climate of a vehicle A control system for controlling the climate of a vehicle includes a control element, a temperature sensor, a motor and a microprocessor. The microprocessor may receive a temperature signal indicative of the temperature at the control element and may receive at leas... | 06/20/2006 |
| 7055620 | Hand-held machine tool The invention is based on a hand power tool having an electric motor (12) located in a housing (10), via which an insertable tool (16) situated in a tool mount (14) is capable of being driven in a rotating manner, and having a safety devi... | 06/06/2006 |
| 7036605 | Power tools A detector is disclosed that detects impact sounds, e.g., a hammer striking an anvil or oil pulses from an oil unit. The detector may comprise a receiver that selectively converts sound within a narrow frequency range into electric signals. Preferably, the impact so... | 05/02/2006 |
| 7034477 | Domestic electrical appliance including an electric motor Domestic electrical appliance, including a universal electric motor powered by direct current via an electrical circuit linked to a DC electrical voltage source, said circuit including a chopper arrangement, including a capacitor in parallel with the DC voltage sour... | 04/25/2006 |
| 6998804 | Electric motor with electronic brake A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as seri... | 02/14/2006 |
| 6995534 | Method of controlling the commutation in an electronically commutated motor, and an electronically commutated motor for carrying out said method A method is disclosed for controlling the commutation in an electronically commutated motor (20) which comprises a stator having at least one phase (24, 26), and a permanent-magnet rotor (22), and with which a current limiter (36, 58) and... | 02/07/2006 |
| 6965208 | Motor speed detecting device for use between motor and system A motor speed detecting device for use between a motor and a system is provided. A motor speed detecting device for use between a motor and a system includes a first input terminal and a second input terminal, wherein the first and second input terminals are electri... | 11/15/2005 |
| 6959587 | Heatable tank leakage diagnosis unit, particularly for motor vehicles In a method and an arrangement for checking the tightness of a vessel (10), especially of a tank-venting system of a motor vehicle, the vessel (10) is charged with a pressure generated by a motor-driven pressure source (30) and the motor current... | 11/01/2005 |
| 6960895 | Coupled RFI choke as stall detection means for brush type DC motor A brush type DC motor 10 having an armature 15 and positive and negative power leads is provided. The motor includes an RFI choke 12 as a transformer in series with at least one of the positive and negative power leads to amplify current such th... | 11/01/2005 |
| 6948578 | Motor in wheel electric drive system A vehicle is powered by an electric linear induction motor (LIM) in at least one of the vehicle wheels and the height from the ground and/or wheelbase changed by the wheel structure and its connection to the vehicle chassis. The LIM is disposed radially outwardly fr... | 09/27/2005 |
| 6930459 | Method for reducing the influence of a DC current component in the load current of an asynchronous motor A method with which the load current and thus the load moment of an asynchronous motor that is controlled via a phase-controlled two-phase thyristor power controller, can be easily influenced so as to allow a smooth starting operation. According to a first embodimen... | 08/16/2005 |
| 6909573 | Disk drive including means for preventing rotation A motor controller includes DC motor, driving mechanism, voltage generator circuit and control unit. The driving mechanism moves an object having a predetermined mass against a load applied to the object and by transmitting a rotational force of the motor to the obj... | 06/21/2005 |
| 6879124 | Method to detect the true zero-crossing points of the phase back EMF for sensorless control of brushless DC motors In the present system and method, ZCP level signals of each phase voltage are first obtained. Among the detected ZCP level signals, some ZCPs are generated by phase back EMF, which are true ZCPs and other ZCPs by commutations, which are false ZCPs. The duration of t... | 04/12/2005 |
| 6798162 | 12/42 volt DC brush motor control system A system 10 provides a variable output voltage to a DC brush motor. The system includes a DC brush motor 14, a DC voltage source 12, a step-up, step-down DC/DC converter 16 including a switch 18. The DC/DC converter is constructed ... | 09/28/2004 |
