Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 8188698 | Integrated fan drive system for air-cooled heat exchanger (ACHE) An integrated fan drive system for air-cooled heat exchangers. The integrated fan drive system has a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan that is directly connected to the rotatable shaft, and a variable frequency drive devic... | 05/29/2012 |
| 8174215 | Motor speed controller In a motor speed controller, feedback control is implemented at a gain independent of the target rotational speed ωT while the increase in the circuit size or processing load is reduced. The rotational speed ω of the motor is controlled on the basis of ... | 05/08/2012 |
| 8174214 | Three-phase low-loss rectifier with active gate drive A three-phase bridge rectifier circuit (BRC) connectable to an AC voltage source (ACVS) via input lines (151, 153, 155) and a load (109) via output lines (157, 159). ACVS (102, 104, 106) supplies BRC (100) with AC voltage waveforms... | 05/08/2012 |
| 8159160 | Apparatus, system, and method for improved fan control in a power supply An apparatus, system, and method are disclosed for controlling fan speed in a power supply. The apparatus measures input power to the power supply and measures the output power provided by the power supply over an interval. The apparatus determines values for the in... | 04/17/2012 |
| 8143819 | Optimized power demand control system for electrical motors An energy conservation system that realizes optimized power demand control for alternating current electrical motors equipped with variable frequency drives is implemented by switching an electrical motor via bypass systems from a variable frequency and speed drive ... | 03/27/2012 |
| 8111028 | Integrated fan drive system for cooling tower An integrated fan drive system for a cooling tower comprising a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan comprising a hub that is directly connected to the rotatable shaft and a plurality of fan blades that are attached to the hu... | 02/07/2012 |
| 8106610 | Heat dissipation device and fan module thereof A heat dissipation device has a main controller and a fan module having a motor coil, a connection interface, a PWM driving circuit and a fan monitor chip. The connection interface has a control pin, an error report pin, a power supply pin and a ground pin. The cont... | 01/31/2012 |
| 8044616 | Method and apparatus for initializing operation of a disk drive A system for controlling a disk in a disk drive includes a motor control circuit and a first circuit that retrieves firmware speed control instructions from non-volatile memory. During retrieval of the firmware speed control instructions, at least one of the motor c... | 10/25/2011 |
| 8022646 | 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... | 09/20/2011 |
| 8018183 | Motor speed controller A speed controller used in a control loop of a motor includes a comparator, a processing device, and an arithmetic logical unit (ALU). The comparator compares a received instruction speed or a received measured speed of the motor with a predetermined speed value, ou... | 09/13/2011 |
| 8013550 | Model train remote control system having realistic speed and special effects control The model train control system includes a remote control device that receives user input with respect to various train functions such as desired speed and effects, and that generates commands based on that input in order to cause the model train to perform in a desi... | 09/06/2011 |
| 8013549 | Counter electro-motoric force based functional status detection of an electro-motor The present invention relates to a circuit for detecting a functional status of an electro-motor. Typical electro-motors need additional components to identify the functional status of the motor. This means additional weight for such motors determining the functiona... | 09/06/2011 |
| 8004223 | Wheel driving apparatus and electric vehicle including the same An electric bike includes a wheel driving apparatus. The wheel driving apparatus includes an electric wheel drive motor which drives a wheel, a gap changer which changes a gap length in the wheel drive motor, and a motor control unit which controls the wheel drive m... | 08/23/2011 |
| 7994744 | Method of controlling speed of brushless motor of ceiling fan and the circuit thereof The present invention relates to a method and a circuit of controlling a speed of a brushless motor of a ceiling fan. The circuit includes a motor PWM duty consumption sampling unit and a motor speed sampling to sense a PWM duty and a speed of the brushless motor. A... | 08/09/2011 |
| 7956561 | Rotor position sensing system of brushless motor A rotor position detecting circuit includes a first position detecting circuit having a low-pass filter that shapes up phase voltage induced in a phase coil and a first comparator that compares the output voltage of the low-pass filter with a threshold level to form... | 06/07/2011 |
| 7928674 | Motor speed control systems A motor speed control system includes a pulse outputting device capable of outputting a pulse each time a motor rotates, a pulse interval determining device capable of determining a pulse interval between the pulses outputted, and a comparative value calculating dev... | 04/19/2011 |
| 7884561 | Method and apparatus for speed control selection in electronically commutated motor This invention relates to a method of speed control selection for an electronically commutated motor comprising the following steps: (a) a motor controller receives an input signal T from a speed control selection circuit; (b) the motor controller retrieves a corres... | 02/08/2011 |
| 7880413 | Model railroad velocity controller Control over velocity of a model train may be determined based upon the speed of rotation of a control knob. A processor receives electronic pulses indicating rotation of the knob beyond a predetermined increment of angular distance. The processor calculates the amo... | 02/01/2011 |
| 7880414 | Control and motor arrangement for use in model train A control and motor arrangement in accordance with the present invention includes a motor configured to generate a locomotive force for propelling the model train. The control and motor arrangement further includes a command control interface configured to receive c... | 02/01/2011 |
| 7863839 | Fan speed control system A fan speed control system for a machine is disclosed. The control system may include a fan to provide a flow of coolant to the machine. The system may further include a first sensor configured to generate a first signal indicative of an operational parameter of the... | 01/04/2011 |
| 7855522 | Motor control method and motor control apparatus A motor control method includes the steps of: measuring a time period from an output of a drive detection signal to a next output of a drive detection signal; storing the measurement result at each time of output of a drive detection signal as a measured cycle; calc... | 12/21/2010 |
| 7839104 | Motor drive circuit, fan motor, electronic device, and notebook personal computer A motor drive circuit includes: a pulse generation circuit configured to generate a pulse signal whose duty ratio of one logic level is increased as a drive voltage is increased in accordance with a target rotation speed of a motor; and a drive control circuit that ... | 11/23/2010 |
| 7808192 | Heat dissipation system A heat dissipation system includes at least one fan, at least two controllers, a signal generator, and a signal converter. The controllers are electrically connected to the fan and generate an enable signal according to a feedback signal of the fan. The signal gener... | 10/05/2010 |
| 7800323 | Method and device for estimating the speed of an electric motor The invention relates to a device and a method for estimating the rotational speed ω of an electric motor when freewheeling, the method being carried out in a variable speed drive for controlling the motor by generating reference alternating voltages Va, Vb. The me... | 09/21/2010 |
| 7781996 | Speed control device for electric motor In a speed control device including a speed instruction generating unit, an addition computing unit, a speed control unit, a current controlling unit, an inertia estimating unit, an inertia setting unit, a switching unit and a constant setting unit, when it is possi... | 08/24/2010 |
| 7777435 | Adjustable frequency pump control system An adjustable frequency pump control system (10) that is primarily designed for use in commercial pool filtration systems. The system (10) automatically selects one of three operating speeds that control the speed of a motor that operates a circulation... | 08/17/2010 |
| 7733042 | Rotor position detection circuit and motor driving device A rotor position detection circuit detects a position of a rotor in a motor from a detection signal of an induced voltage generated in a stator coil. The circuit includes: a first low pass filter having a first reference potential for filtering the detection signal;... | 06/08/2010 |
| 7705549 | Series resistor assembly for an electric motor, circuit arrangement comprising a series resistor assembly for operating an electric motor and use of said assembly The invention relates to a series resistor assembly (1) for an electric motor (M), in particular for an electrically driven ventilating fan in a vehicle. Said assembly comprises a series resistor (2) for controlling the RPM of the electric motor (M) in... | 04/27/2010 |
| 7701158 | Fan system and speed detecting device thereof A fan system includes a driving device, a speed detecting device and a logic device. The driving device generates a speed detecting signal and a predetermined alarm signal. The speed detecting device, which is electrically connected with the driving device, receives... | 04/20/2010 |
| 7679300 | Trigger switch A trigger switch performs speed control of a motor according to a pull-in amount of a trigger. A wiring path for lead wires connects the trigger switch and an auxiliary device. The wiring path is formed in an insulating wall. The insulating wall isolates a pair of p... | 03/16/2010 |
| 7633250 | Fan The present invention provides a fan that has a fan motor and two signal lines including a number-of-rotations switching control signal line and a rotational state outputting signal line, makes the fan motor rotate at a number of rotations determined by a number-of-... | 12/15/2009 |
| 7619379 | Motor control device and setting method thereof A motor control device includes a recording module and a controlling module. The recording module has a revolution speed table recording a plurality of predetermined revolution speed values. The controlling module receives a reference revolution speed control signal... | 11/17/2009 |
| 7619380 | Method and apparatus for controlling rotational speed of fan An apparatus for controlling rotational speed of a fan includes a sensor module, a single chip microcomputer (SCM) module, and a driving module. The sensor module collects rotational speed signals of a fan, and converts the rotational speed signals to voltage signal... | 11/17/2009 |
| 7615946 | Fan speed control device A fan speed control device includes a management selection module, a first and a second buffers, a resistor, a transistor, and a switch. Depending upon whether a motherboard supports a system of a baseboard management control or not, the fan speed control device sel... | 11/10/2009 |
| 7612508 | System and method for communication with an information handling system cooling fan An escape sequence coded in power commands from a system controller, such as a BMC, to a cooling fan controller directs the cooling fan to send identification information coded in tachometer readings to the system controller for use by an information handling system... | 11/03/2009 |
| 7598690 | Start-up circuit for DC fan A start-up circuit which decreases a start-up current and stabilizes running of a DC fan. The start-up circuit includes a digital-analog converter for convert a digital control signal from a control chip to an analog control signal, a voltage sampling device connect... | 10/06/2009 |
| 7595598 | Magnetizing motor and magnetizing method thereof A magnetizing motor having a permanent magnet body covering an outer circumferential surface of a rotor body, includes a speed detecting unit that detects a speed of the magnetizing motor; and a controlling unit that compares the speed detected by the speed detectin... | 09/29/2009 |
| 7573214 | 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... | 08/11/2009 |
| 7548034 | Centrifuge A centrifuge including: a rotor rotating with a sample contained therein; a rotating shaft rotatably engaged with the rotor; a motor rotating the rotor and the rotating shaft; a belt transmitting rotational force of the motor to the rotating shaft; a rotor speed det... | 06/16/2009 |
| 7538503 | Hand-held power tool, in particular a trimmer or the like, having an electric drive motor A hand-held power tool has an electric drive motor having a drive shaft and a tool connected to the drive shaft and rotatably driven by the drive shaft. The drive motor has a control device that has correlated therewith at least a first operating curve and a second ... | 05/26/2009 |
