Abstract: A power tool includes a housing, a motor disposed in the housing, an output spindle configured to be driven by the motor, an input switch, and a controller configured to control power being delivered to the motor. The controller is operable in one of: (a) a normal mode where the controller causes continuous electric power to be delivered to the motor during actuation of the input switch in a first range of positions; and (b) a feathering mode where the controller causes discontinuous electric power to be delivered to the motor during actuation of the input switch in a second range of positions that is different from the first range of positions motor to simulate feathering the input switch.

Abstract: Systems and methods are provided for amplifying multiple input signals to generate multiple output signals. An example system includes a first channel, a second channel, and a third channel. The first channel is configured to receive one or more first input signals, process information associated with the one or more first input signals and a first ramp signal, and generate one or more first output signals. The second channel is configured to receive one or more second input signals, process information associated with the one or more second input signals and a second ramp signal, and generate one or more second output signals. The first ramp signal corresponds to a first phase. The second ramp signal corresponds to a second phase. The first phase and the second phase are different.

Abstract: A gate driver controller, inverter circuit apparatus, and associated discharge method for electric vehicles are disclosed. An example gate driver controller includes a mode determiner to set a mode of operation of the gate driver. The example device includes a gate driver control to control the gate driver to set the gate driver to: a) on, b) off, or c) generate a pulse width modulation signal. When in a first operating mode and set to on, stored energy is to be transferred from a capacitor to a motor winding inductor via a power transistor activated by the gate driver to dissipate a first portion of the stored energy. When in a second operating mode, a second portion of the stored energy is to be transferred from the motor winding inductor to the power transistor to dissipate the second portion of the stored energy.

Abstract: A power tool includes a housing, a motor disposed in the housing, an output spindle configured to be driven by the motor, an input switch, and a controller configured to control power being delivered to the motor. The controller is operable in one of: (a) a normal mode where the controller causes continuous electric power to be delivered to the motor during actuation of the input switch in a first range of positions; and (b) a feathering mode where the controller causes discontinuous electric power to be delivered to the motor during actuation of the input switch in a second range of positions that is different from the first range of positions motor to simulate feathering the input switch.

Abstract: A circuit for controlling power to a load from a rectified AC supply is disclosed. The load like an LED or another type is driven by a power device such as a MOSFET or a transistor. The power device is biased from a resistive string which also includes a thyristor switch in series combination. At a specific trigger or conduction angle of the thyristor switch the proper bias for the power device is obtained to enable the load current to remains fairly constant with AC supply voltage fluctuations or loading. Furthermore the trigger circuit of the thyristor switch is properly configured in order for the load current to stay constant or even change with ambient temperature variations as well.

Abstract: A galley (10) for an aircraft comprises a plurality of electrical kitchen appliances (24) that differ functionally from one another. Of these, at least a partial number of at least two electrical appliances comprise in each case an operator control unit (26), which is manufactured structurally separate from a main functional part of the relevant appliance and has an arrangement of operator control elements for operator control of the appliance. The operator control units are in this case designed to be of an identical construction to one another from appliance to appliance.

Abstract: A power tool system includes: a power tool including an AC motor; a portable battery pack; and a power supply device that converts a DC power supplied from the portable battery pack into an AC power to supply the AC power to the AC motor.

Abstract: A hand power tool includes a drive unit, an electronic unit, and a switching unit. The switching unit includes at least one actuating element configured to activate and deactivate the drive unit. The switching unit also includes at least one switching element configured to be positioned in at least one first switching position to set at least one first operating mode. The at least one switching element is also configured to be positioned in at least one second switching position to set at least one second operating mode.

Abstract: Embodiments of the present invention include a composite electromechanical machine which can operate as a motor, a generator (including dynamo or alternator), or any combination thereof. In an aspect, the present composite electromechanical machine comprises at least a double-sided magnetic plane (e.g., rotor or stator) to form two rotor/stator pairs, together with a controller to configure the multiple rotor/stator pair. The controller can configure or convert the multiple rotor/stator pairs into motors, generators, or nonoperation, and also can change the windings characteristics of the magnetic planes. The controller can add new functionality and characteristics to the present composite electromechanical machine. Other embodiments can also be included.

Abstract: A variable-delay-time control system for a motor is provided. The system includes a control unit, a driving unit, and a motor. The control unit is used to output at least one control signal according to at least one predetermined signal, and the control signal has a variable delay time. The driving unit is connected to the control unit, and is used to receive the control signal and generate a driving signal. The motor is connected to the driving unit, and conduction time of the motor is controlled according to the driving signal and the variable delay time. With the variable-delay-time control system of the present invention, the delay time of the control signal is variable, so the motor can operate at a high efficiency (for example, at a reduced current). Moreover, as the variable-delay time can be adjusted according to the predetermined signal, the motor can operate at a high efficiency in different operating states, thus improving the overall efficiency of the motor.

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: 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 rotation speed control circuit of a power supply system is provided, which is applicable for controlling the rotation speed of the fan according to a loading state outputted by the power supply system. The fan rotation speed control circuit of the power supply system includes a waveform generating module, for generating an oscillating waveform signal; a current retrieving module, for retrieving a current signal corresponding to the loading state; a rotation speed control signal generating module, for comparing the oscillating waveform signal with the current signal, and generating a rotation speed control signal; a signal amplifying module, for amplifying an amplitude of the rotation speed control signal and outputting the amplified rotation speed control signal to the fan, so as to control the rotation speed of the fan.

Abstract: Certain exemplary embodiments can include a static DC electric drive system for mining equipment. The drive system can include: an active front end adapted to receive an AC voltage and output a substantially constant DC voltage; and a DC chopper coupled to the active front end, the DC chopper adapted to receive the substantially constant DC voltage and output a variable DC voltage.

Abstract: A system air fans integrated control apparatus for a computer system which has a plurality of heat sources and a plurality of air fans corresponding to the heat sources includes a plurality of detection units to detect the heat sources and output a plurality of temperature alteration parameter signals, a signal integration and determination circuit to receive and interpret the temperature alteration parameter signals to determine a rotation speed regulation signal, and an air fan driving circuit which is linked to the signal integration and determination circuit and an external driving power source. Upon receiving the rotation speed regulation signal the driving power of the external driving power source to the air fans is regulated synchronously. Thereby multiple heat sources are detected at the same time and multiple air fans are integrated to perform heat dissipating to reduce accumulating heat in the system environment.

Abstract: A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sine wave signal to a varied Hall PWM signal. The speed signal generator is connected to an external PWM input signal to set speed of a fan motor and a low speed voltage to determine a present speed setting signal. The speed signal generator further obtains the varied Hall PWM signal to compare the present speed setting signal to generate a SPWM signal to the PWM driver. The PWM driver outputs a SPWM signal to the full-bridge switching circuit and then coil current is formed close to a sine wave signal to decrease the electromagnetic noise.

Abstract: A DC motor includes a power source, a stator and a rotor. Permanent magnets are mounted to either the stator or the rotor. Electromagnets are mounted to the other of either the stator or the rotor. Each electromagnet includes two coils which are each branched with a capacitor. A switching means, responding to the rotor, switches between a first mode in which the power supply is connected across a branch for energizing the coil and charging the capacitor and a second mode in which the branch terminals are closed for discharging the capacitor into the coil. The switching means and branches are arranged such that the coils of a particular electromagnet maintain the same polarity while also alternating between opposite polarities.

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 multi-mode motor controller architecture includes a motor, an integrated circuit controller, and an integrated circuit driver circuit. The integrated circuit controller includes a pulse generator, a DAC, an ADC, and a digital compensator circuit. The integrated circuit driver circuit is in communication with the controller and includes an error amplifier, first and second output amplifiers for driving the motor, and a sense amplifier. The motor controller architecture is configurable to operate in a linear mode, a pulsed mode, or a switchable linear/pulsed mode. The controller architecture can be implemented with external compensation circuitry, such as a resistor-capacitor circuit, or with the digital compensation circuitry located within the controller integrated circuit.

Abstract: Upon receipt of a reference voltage signal Vi and a multiplicity of logic control signals L1 and L2, the loading drive system converts the signals received into a first control voltage Vi1 and a second control voltage Vi2 in such that the voltage difference between the two logic control signals L1 and L2 represents the reference voltage signal, and the polarity of the difference represents the logic control signals. When the first and the second control voltages Vi1 and Vi2 are below a predetermined level, the one lower than the predetermined level is converted to zero Volt, and then the differences Vi1−Vi2 and Vi2−Vi1 are formed to define a first and a second output voltages, Vo1 and Vo2, respectively. Thus, the logic control signals and the reference voltage signal can be supplied from the controller to the loading driver by a fewer number of signal lines, and so are input and output terminals or pins associated with the signals.

Abstract: A speed control circuit of a direct current motor comprises a switching regulator IC 10. The switching regulator IC 10 is composed of a reference voltage generator 12 which generates a reference voltage of 5V, a first operational amplifier OP1, a second operational amplifier OP2, a third operational amplifier OP3, a triangular wave generator 14 which generates a triangular wave, and a transistor TR1. The speed control circuit is constructed using a general switching regulator IC; therefore, it is possible to cheaply and readily manufacture the speed control circuit of the direct current motor.

Abstract: A wiper-washer system for vehicles comprises at least one wiper drivable by a wiper motor and a washer device which includes a water reservoir and a water pump motor. The wiper and water pump motors are activated through a switching arrangement. The wiper motor is in the form of a direct current motor with a gearbox, designed for only a single rated speed. In addition a hybrid electronics unit provided with a control, a driver and a power output stage is fitted directly on or in the housing of the wiper motor. It is advantageous that the direct current motor for the wiper is of simpler construction and operates at more favourable working conditions than a two-speed direct current motor conventionally used. By means of the hybrid electronics unit the working current is supplied to the wiper motor in the absence of mechanical contact devices. Compared with conventional wiper-washer systems the outlay on cabling is reduced. Advantageous embodiments of the system are also described.

Abstract: A vehicle fan motor controller includes a simple planar ceramic base providing a plurality of printed resistors. The resistors include electrically conductive paths printed on the ceramic overcoated with a thick resistive film. The thick film substantially covers the base to promote heat transfer to air moving in the fan duct in which the controller is placed. The thick film resistors are on both sides of the base to reduce overall size and improve heat transfer. A thermal fuse comprising a spring metal member held in a normally closed position by a meltable material opens in response to a predetermined high temperature.