Abstract: The present invention includes a phase angle detection unit generating a phase angle signal switched at a timing at which a cogging torque generated with the rotation of a rotor of a brushless DC motor reaches near a peak on a negative side hindering the rotation of the rotor, an inverter circuit energizing coils of respective phases of the brushless DC motor by switching elements according to an input of a driving signal, an energization period calculation unit calculating an energization period Tw from a target rotation speed set for the brushless DC motor, and a drive control unit energizing the coils sequentially by outputting the driving signal to the respective switching elements for each energization period, gradually increasing a duty of the driving signals to the switching elements at a start of each energization period, and decreasing the duty after the phase angle signal is switched.

Abstract: A work vehicle including a hydraulic circuit having a cooled return line with a cooler, a bypass return line that bypasses the cooler on the cooled return line, and a controller that electronically controls the flow of hydraulic fluid between the cooled return line and the bypass return line.

Abstract: A method and device for controlling an electric motor, in particular a machine tool drive, wherein during a sensorless open-loop control mode of operation of the electric motor the speed and the torque are determined from the motor current and the motor voltage, and the moment of inertia of the electric motor torque are determined from the determined motor current and the determined motor voltage, wherefrom then a control torque is determined, which is then associated with an open-loop torque control value and supplied as the torque setpoint value to a control element for setting the motor current and/or the motor voltage in the open-loop mode of operation. As long as the speed is below a minimum speed, the control element receives as input variable a control or pilot control torque generated from a predefined moment of inertia for a sensorless closed-loop control mode of operation of the electric motor.

Abstract: A fan control circuit includes a first switch element, a second switch element, and a fan connector. A first control terminal of the first switch element is connected to a fan control terminal to receive a pulse width modulation signal. A first terminal of the first switch element is connected to a first voltage source. A second control terminal of the second switch element is connected to the first terminal of the first switch element. A fourth terminal of the second switch is connected to a second voltage source via a NTC resistor. A first pin of the fan connector is connected to ground. A second pin of the fan connector is connected to a third terminal of the second switch element. A third pin of the fan connector is connected to a signal receiving terminal. The third pin is configured to receive a feedback signal indicating a rotating speeding of the fan.

Abstract: A circuit for controlling a rotation speed of a computer fan includes a control chip, a conversion circuit, a fan header, a first switch, and a second switch. When a first terminal of the first switch is connected to a second terminal of the first switch, and a first terminal of the second switch is connected to a second terminal of the second switch, the conversion circuit converts a control signal received from the control chip to a voltage signal, and outputs the voltage signal to a power pin of the fan header. When the first terminal of the first switch is connected to a third terminal of the first switch, and the first terminal of the second switch is connected to a third terminal of the second switch, a control pin of the fan header receives the control signal, the power pin receives power from a first power supply.

Abstract: A robot including a controller and multiple servos, each acting as an actuator, and a supply voltage generator circuit connected to a transmission line between the controller, which controls using the RS485 communication protocol, and the servos. The reference voltage generator circuit maintains one of a pair of differential signals (or an inversion signal) at a constant potential between a high level and a low level. As a result, a TTL communication scheme servo can be mounted and controlled, along with a RS485 scheme servo. A supply voltage generator circuit is formed of a Zener diode and a voltage divider circuit. Without being limited to incorporation at some midpoint on the transmission path, the supply voltage generator circuit can be incorporated in a controller or a hub for splitting a transmission path.

Abstract: A motor driving circuit for adjusting speed of the motor by changing output voltage is disclosed. One end of the motor is coupled to a variable voltage source. The motor driving circuit includes a motor-driving unit, a control unit and a determining unit. The motor-driving unit includes a first end coupled to another end of the motor, a second end coupled to a ground and a third end, and is utilized for driving the motor. The control unit is utilized for controlling the voltage between the first end and the third end of the motor-driving unit. The determining unit is coupled between the variable voltage source and the control unit, and is utilized for controlling the control unit to adjust the voltage between the first end and the third end of the motor-driving unit according to magnitude of the voltage of the variable voltage source.

Abstract: A system can control a rotary speed of a computer fan according to the type of the computer fan. If the computer fan is determined to be a 3-pin fan, the system can output a changeable voltage to control the rotary speed of the 3-pin fan.

Abstract: The invention relates to an electronic control device for regulating the voltage across a high-side load, especially for regulating a fan in a motor vehicle, with a control voltage (V1) which is referenced to system ground and which is mirrored to the positive high-side supply voltage, wherein the control voltage (V1) is supplied to the base of a first transistor (Q1) operated in common-emitter connection, which transistor (Q1) has, in the emitter circuit, a first resistor (R1) and, in the collector circuit, a second resistor (R2) and, in series with the latter, the base-emitter diode of a second transistor (Q2). Compensation for temperature effects of the base-emitter voltage of the first transistor is performed by the base-emitter path of a second transistor of the same conductivity type in series with the first transistor.

Abstract: A fan system includes a connecting device, a controlling device and a fan device. The connecting device has a plurality of pins receiving at least one driving signal and a start signal. The control device is electrically connected to the pins of the connecting device and has a start control unit. The start control unit generates a first enabling signal in accordance with the start signal. The control device synchronously outputs the first enabling signal and the driving signal. The fan device is electrically connected to the control device and has a plurality of fans. The fan device synchronously transmits the driving signal to the fans and synchronously drives the fans to rotate in accordance with the first enabling signal.

Abstract: If a PWM duty instruction D1 determined by a duty calculation circuit exceeds an upper limit value, a duty signal processing circuit in a motor drive apparatus divides a switching current supply period in each of the phases into a first current supply period and a second current supply period. In the first current supply period, the duty is set to the upper limit value. In the second current supply period, the duty is set to 100%, and the length of the second current supply period is set depending upon the duty instruction.

Abstract: A circuit for controlling rotation speed of a computer fan includes a fan connector providing for controlling the rotation speed of the computer fan, a rotation speed detector providing for detecting the rotation speed of the computer fan, a BIOS chip connected to the fan connector via the rotation speed detector and provided for receiving, and comparing rotation speed signals from the rotation speed detector, a super I/O chip connected to the BIOS chip and provided for outputting either a PWM signal or another PWM signal to be converted to a voltage signal to control rotation speed of the computer fan according to the result of the comparison, a integrated circuit connected to the super I/O chip and the fan connector and configured for converting the another PWM signal to an analog voltage signal.

Abstract: A circuit for controlling rotation speed of a computer fan includes a fan header for connecting to a 4-pin fan or a 3-pin fan, a jumper device, an amplifier, and a controller. The jumper device has a first pin for receiving a controlling signal, and connected to a first power source, a second pin connected to the fan header, and a third pin connected to the first power source. The amplifier has an input terminal connected to the third pin of the jumper device via an integrator. The controller has a first terminal connected to an output terminal of the amplifier, a second terminal connected to a second power source, and a third terminal connected to the fan header and connected to a positive input terminal of the amplifier via a resistor. The first pin of the jumper device is selectively connected to the second or third pin.

Abstract: A motor driving system includes a power supply, a driver, a motor, and a control unit. The driver includes a driving module and a power converting module. The driving module is connected to the power supply. The power converting module is connected to the power supply. The motor includes a power terminal connected to the power converting module. The control unit is connected to the power converting module. The power supply is configured to provide power for the driver. The driving module is configured to control the motor. The control unit is configured to control the power converting module to output a changeable voltage to the motor.

Abstract: A motor control is provided with both open loop and closed loop controllers. The open loop and closed loop controllers provide commutation signals back to gate drives for an inverter, wherein the commutation signals utilize sinusoidal signals in open loop control, and utilize six step commutation in closed loop control.

Abstract: A refrigerant system (10, 100, 200) is provided with a power control system (30, 130, 230). The power control system adjusts the speed of the motors driving the refrigerant system components such as a compressor, a fan or a pump via a variable speed device (75, 175, 275) or bypasses the variable speed device (75, 175, 275) for normal operating speeds. A single power control system may be provided for the entire refrigerant system or each component may be independently controlled.

Abstract: 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 different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: A circuit for controlling rotation speed of a computer fan includes a fan header for connecting to a 4-pin fan or a 3-pin fan, a jumper device, an amplifier, and a controller. The jumper device has a first pin for receiving a controlling signal, and connected to a first power source, a second pin connected to the fan header, and a third pin connected to the first power source. The amplifier has an input terminal connected to the third pin of the jumper device via an integrator. The controller has a first terminal connected to an output terminal of the amplifier, a second terminal connected to a second power source, and a third terminal connected to the fan header and connected to a positive input terminal of the amplifier via a resistor. The first pin of the jumper device is selectively connected to the second or third pin.

Abstract: A drive control device is provided with a determining section and a voltage increasing section. The determining section determines if the actual acceleration is deficient in comparison with the acceleration requested by the driver or if the generator output is deficient in comparison with the acceleration requested by the driver. The voltage increasing section increases the voltage supplied to the electric generator from a vehicle mounted electric power source when the determining section determines that the actual acceleration or the generator output is deficient. As a result, the generator output deficiency is eliminated and the required motor torque is produced, thereby enabling the vehicle to start into motion appropriately in accordance with the acceleration requested by the driver.

Abstract: A motor control device includes a rotation speed control circuits a voltage transforming circuit, a buffering circuit and a driving circuit. The rotation speed control circuit provides a rotation speed control signal. The voltage transforming circuit is electrically connected to the rotation speed control circuit and transforms the rotation speed control signal to a speed control voltage signal. The buffering circuit, electrically connected to the voltage transforming circuit, receives the speed control voltage signal and delays or buffers output of the speed control voltage signal. The driving circuit, electrically connected to the buffering circuit, receives the speed control voltage signal from the buffering circuit and generates a driving signal according to the speed control voltage signal so as to control the operation of the motor.

Abstract: Electrically powered devices are provided that are generally capable of automatically adjusting an operating speed of a tool removably connected to the device. The device includes circuitry that evaluates tool wear for the tool removably connected to the device, produces a tool wear speed related signal, and adjusts the operating speed of the tool based on the speed related signal. The device may further be capable of automatically setting the initial operating speed of the particular tool removably connected to the device by identifying the particular tool and setting the initial operating speed which may later be adjusted.

Abstract: A steam-vacuum cleaner with an electric power controlling function and a method thereof are provided. The steam-vacuum cleaner includes a suction motor which rotates to generate a suction force; a heater which emits heat to generate a steam; a power supply part which supplies an electric power to the suction motor and the heater; an electric power measuring part which measure a total electric power supplied from the power supplier and consumed in the suction motor and the heater; and a controller which controls at least one of a rotational velocity of the suction motor and a magnitude of heat emitted from the heater such that the total electric power of the suction motor and the heater is maintained less than a threshold value. Accordingly, steam and vacuum cleaning functions are simultaneously performed within the limit of power capacity of a wire.

Abstract: A control apparatus for multiplexing a single distributed control amplifier to control multiple axes of motion in a multi-axis machine. In one example, the control apparatus comprises a distributed control motor amplifier, a first motor constructed and arranged to provide movement along a first axis of motion, a second motor constructed and arranged to provide movement along a second axis of motion, a first relay having a switch coupled to the distributed control motor amplifier, a first contact coupled to the first motor, a second contact coupled to the second motor, and an input for receiving an actuation signal, wherein the relay is configured to be manipulated between a first state in which the switch is electrically connected to the first contact a second state in which the switch is electrically connected to the second contact, in response to the actuation signal.

Abstract: A method for emulating induction motor operation using an electronically commutated motor (ECM) is described herein. The method includes receiving, at the ECM, a desired operating torque, accessing induction motor operating characteristics stored within the ECM, and calculating a new torque demand if a speed associated with the desired operating torque is greater than a breakdown speed of the induction motor. The method also includes setting an output torque for the motor substantially equal to the torque demand for the motor if the speed associated with the desired operating torque is less than the breakdown speed of the induction motor, moving the output torque toward the demanded torque if not substantially equal, and operating the motor at the output torque.

Abstract: The disclosed embodiments relate to circuits that produce synchronized output signals. More specifically, there is provided a synchronization circuit adapted to receive an input signal, the synchronization circuit comprising a delay monitor adapted to produce a delayed input signal, a counter adapted to determine a difference between the input signal and the delayed input signal and produce a coarse timing signal in response thereto, a circuit adapted to produce a fine timing signal based on the input signal, and a circuit adapted to combine the coarse timing signal and the fine timing signal to produce an output signal.

Abstract: A fan system includes a connecting device, a controlling device and a fan device. The connecting device includes a first pin receiving at least one driving signal, and a second pin receiving a start signal, wherein a length of the first pin is greater than a length of the second pin. The controlling device is electrically connected with the connecting device and includes an enabling unit. The enabling unit generates at least one first enabling signal according to the start signal, and the controlling device outputs the driving signal and the first enabling signal. The fan device is electrically connected with the controlling device and includes at least one fan. The fan device transmits the driving signal to the fan and drives the fan according to the first enabling signal.

Abstract: A fan system includes a connecting device, a controlling device and a fan device. The connecting device has a plurality of pins receiving at least one driving signal and a start signal. The control device is electrically connected to the pins of the connecting device and has a start control unit. The start control unit generates a first enabling signal in accordance with the start signal. The control device synchronously outputs the first enabling signal and the driving signal. The fan device is electrically connected to the control device and has a plurality of fans. The fan device synchronously transmits the driving signal to the fans and synchronously drives the fans to rotate in accordance with the first enabling signal.

Abstract: 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 different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: Apparatus for reconstructing the phase currents of a multiphase load driven by a multiphase inverter fed by a DC link and controlled by a PWM controller, the apparatus including a sensor in the DC link, first and second sampling arrangements for sampling the current in the DC link by obtaining an output from said sensor, the first sampling arrangement obtaining a first sample of the current in the DC link during a first time period corresponding to a first switching pattern of said multiphase inverter and storing said first sample; the second sampling arrangement obtaining a second sample of the current in the DC link during a second time period after said first time period and corresponding to a second switching pattern of said multiphase inverter and storing said second sample; an A/D converter for converting said first sample to a digital signal during a time period after said first time period and for converting said second sample to a digital signal during a following third time period.

Abstract: A brushless DC motor drive system includes a pole-position detector for detecting respective pole positions of permanent magnets of a rotor of a brushless DC motor. A present speed computing unit computes a present speed of the brushless DC motor on the basis of an output signal from the pole-position detector. A speed differential computing unit computes a speed differential between a speed command and the present speed. An energization start time computing unit computes an energization start time in a present instance on the basis of an energization start time in a preceding instance, and the speed differential. An energization start instruction unit instructs energization start upon the elapse of the energization start time in the present instance from a phase changeover point in time. An energization completion time computing unit computes an energization completion time by subtracting the energization start time in the present instance from preceding pulse time.

Abstract: A method and apparatus for controlling the speed of a DC electric motor receives a periodic commutation signal having a fixed duration on cycle and an off cycle. The commutation signal then is modified to form a periodic modified commutation signal having substantially the same period duration as the commutation signal. The modified commutation signal has a single on cycle per period. The method and apparatus then determine a desired speed of the motor, and vary the duration of the on cycle of the commutation signal to form the on cycle of the modified commutation signal. The on cycle of the modified commutation signal has a duration that is less than the fixed duration. By varying in this manner, the rotor rotates at substantially the desired speed.

Abstract: A serial fan set and rotation speed-matching curve generation method thereof are provided. The serial fan set comprises a rotation speed control module, a first fan and a second fan, in which the rotation speed control module is used to receive the power signal and produce the rotation speed driving signal corresponding to the power signal in accordance with the relations of the rotation speed-matching curve, so that the first fan and the second fan are operated at the matching rotation speed, thus producing the optimum operation efficiency and achieving the purpose of controlling the serial fan set.

Abstract: A method for determining an effective resistance of a voltage controlled DC motor having a nominal resistance includes driving the DC motor with a signal so that the DC motor has a targeted acceleration, and sensing an effective acceleration of the DC motor. The effective resistance of the DC motor is determined as a function of the nominal resistance, the targeted acceleration and the effective acceleration.

Abstract: The present invention concerns a motor vehicle comprising at least one electric motor, an energy storage device for providing drive energy for the electric motor, a plug connector connected to the energy storage device for connection to a current source and a control means for controlling the flow of current from the current source to the energy storage device. Therefore the object of the invention is to provide a motor vehicle which can contribute to moderating the loading at consumption peaks in the network. A motor vehicle comprising at least one electric motor, an energy storage device for providing drive energy for the electric motor, a plug connector connected to the energy storage device for connection to a current source and a control means for controlling the flow of current from the current source to the energy storage device, characterized in that the control means permits a flow of current from the energy storage device to the current source (network).

Abstract: A method of operating a cooling fan in a cooling system for a vehicle includes determining a required speed of the cooling fan. First and second signals are provided to a motor controller operatively connected to a motor having a rotatable portion connected to the cooling fan. The first signal coarsely controls a rotational speed of the motor by adjusting a voltage level provided to the motor and the second signal finely controls the rotational speed of the motor by pulse width modulation so that the cooling fan rotates at the required speed.

Abstract: A permanent magnet DC brushless motor control assembly permits a user to select the permanent magnet DC brushless motor operating characteristics by selecting appropriate control circuits to interface with the motor. The assembly includes a permanent magnet DC brushless motor, a commutator electrically coupled to the motor, and at least one control module electrically coupled to the commutator, to control operating characteristics of the permanent magnet DC brushless motor.

Abstract: A speed control circuit for a brushless dc motor includes a motor drive circuit, a drive member and a PWM control circuit. The motor drive circuit includes at least one coil and at least one transistor serially connected to the coil. The drive member is provided with a plurality of output terminals adapted to output a driving signal to the transistor of the motor drive circuit. The PWM control circuit is in connection between the transistor of the motor drive circuit and the output terminal of the drive member, thereby turning the transistor on or off.

Abstract: A drive unit, in particular for a fan in motor vehicles, is indicated, comprising an electric motor (12) operated on a DC line (UBat), and comprising a device (13) for controlling the speed of the motor (12) by changing the operating voltage applied at the motor (12).

Abstract: An object of the invention is to provide a motor controller and a mechanism characteristic measurement method, which enable measurement of a frequency response of a mechanism without involvement of positional displacement or torque saturation, as well as simultaneous measurement of a frequency characteristic and identification of inertia. A detector (20) detects the position of a motor, and a differentiator (26) calculates the speed of the motor from the position of the motor. An command generation section (11) fixes a position command to a current position. A position control section (12) generates a speed command such that the position command matches the position of the motor. A speed control section (13) generates such a torque command that the speed command coincides with the speed of the motor.

Abstract: An electronically commutatable motor having field windings activatable in sequence with a commutation frequency via semiconductor output stages using control signals connectable and disconnectable from a direct voltage supply, the control signals being clocked using pulse width modulation. Noise generation from connection and disconnection of the current applied to field windings is minimized by flattening of the rising and/or falling edges of the current in the field windings. The pulse width ratio increases in the rising edges of the control signals from a low initial value to an operating value assigned to the setpoint as a function of a selected setpoint for the motor speed or output, and, in the falling edges of the control signals, the pulse width ratio starts from the existing operating value and is reduced to a lower final turn-off value as a function of the existing actual value of the speed or the output of the motor.

Abstract: A children's ride-on vehicle having an electronic speed controller adapted to regulate at least one of the timing and rate of application of a selected rotational input. The vehicle includes a body with a seat, a steering mechanism positioned for operation by a child to steer at least one of the vehicle's wheels, and a drive assembly with an actuator positioned for actuation by a child sitting on the seat to cause the driven rotation of at least one of the vehicle's wheels by a battery-powered motor assembly. In some embodiments, the drive assembly includes one or more user input devices that enable a child sitting on the seat to select at least one of the relative speed and direction of the vehicle. The drive assembly also includes an electronic speed controller that controls electronically the transmission of a selected rotational input to the vehicle's driven wheel assembly.

Abstract: The invention relates to a method for control of the speed of rotation of a separately excited direct current motor for model vehicles, the speed of rotation of the motor being controlled by means of a pulse sequence, the motor being alternately supplied with a supply voltage during a switch-on period and disconnected from the supply voltage during a switch-off period, the duration of the switch-off period being dependent on the deviation of an actual value from a set value for the speed of rotation of the motor. In order to further develop the method in such a way that the separately excited motor has a low noise output and stable control is possible over a wide range of speed of rotation, it is proposed that a pulse width modulated signal is provided, the pulse width of which is dependent on the average torque loading of the motor, and that the pulse width modulated signal is combined with the pulse sequence by an AND-operation.

Abstract: The invention relates to a method for control of the speed of rotation of a separately excited direct current motor for model vehicles, the speed of rotation of the motor being controlled by means of a pulse sequence, the motor being alternately supplied with a supply voltage during a switch-on period and disconnected from the supply voltage during a switch-off period, the duration of the switch-off period being dependent on the deviation of an actual value from a set value for the speed of rotation of the motor. In order to further develop the method in such a way that the separately excited motor has a low noise output and stable control is possible over a wide range of speed of rotation, it is proposed that a pulse width modulated signal is provided, the pulse width of which is dependent on the average torque loading of the motor, and that the pulse width modulated signal is combined with the pulse sequence by an AND-operation.

Abstract: There is provided a brushless DC fan motor which can eliminate an oscillator for PWM, control the motor speed at a low cost with high accuracy, and efficiently adjust the temperature in a housing for electronic appliances when radiating the heat in the housing. The brushless DC fan motor with the rotational speed thereof controlled by controlling the voltage of a control input terminal of a drive circuit comprises a differential amplifier in which the voltage signal for controlling the speed is inputted in a first input terminal and the reference voltage signal is inputted in a second input terminal. The differential amplifier is linear in the input-output characteristic, and can set the rise characteristic of a desired gradient, and control the motor speed with high accuracy without using the PWM signal for the input signal. The voltage signal from the output terminal of the differential amplifier is given to the control input terminal of the drive circuit.

Abstract: A system, which may be a cooling system for a motor vehicle engine, has two direct current motors together with switching circuits which provide selective connection of the windings of the two motors to a direct current voltage source in such a way as to obtain different operating modes for each motor. One of the motors has four brushes, the first of which is permanently connected to the first polarity of the source, while its second, third and fourth brushes are arranged so that they can be connected to the appropriate source polarities respectively through either three interruptors or two. The second motor has two brushes permanently connected, respectively, to the same first source polarity and to the third or fourth brush of the first motor.

Abstract: A sphere which may be rotationally displaced by manual action, protruding from a control panel, is mechanically connected for resolving its rotary motion into motions about two axes perpendicular to each other, for control of the direction and speed operation of a video recorder and playback equipment. When any of several particular rotary displacements of the sphere have taken place, a controllable brake system bears on the mechanical coupling between the sphere and at least one of in the electronic transducers to exert a brake torque to simulate an index position. One such position is a neutral setting or "rest position". The y axis is used for gradual speed change and the x axis is used for stepwise speed change. The axis for gradual speed change has an initial threshold on each side of the rest position to determine direction. On the other axis, the speed steps may be separate for each direction, respectively on opposite sides of the rest position.

Abstract: An arrangement is disclosed for controlling fan motors in fan-powered terminal units which permit the air flow of the terminal units to be factory preset and reset using a voltmeter. The fan motor is responsive to the pulse width of pulses of a pulse width modulated signal to provide an air flow which is proportional to the pulse width. By adjusting the pulse width, the air flow may be set as desired. A pulse width modulated signal having pulses with a set amplitude and frequency is generated. The dc voltage of the pulse width modulated signal is measured using a voltmeter. As the pulses have a set amplitude and frequency, the pulse width of the pulses may be adjusted by controlling the dc voltage of the pulse width modulated signal. The fan motor is programmed to deliver the set air flow over a range of static pressures.