Abstract: A DC motor device includes a first converting circuit, a second converting circuit, and a DC motor. A switch element is coupled to the DC motor device, and provides an alternating current to the first or second converting circuit. The first converting circuit receives the alternating current, and generates a first rotation speed signal. The second converting circuit receives the alternating current, and generates a second rotation speed signal. The DC motor is driven at a rotation speed according to the first or second rotation speed signal.

Abstract: In an impact driver, a link unit (a link sleeve and first and second elongated protrusions) is provided between the mode switching ring for selecting an operation mode and the slide button for selecting the rotation speed. With the link unit, a switching operation of a slide button to the high-speed side is performed in coordination with a selecting operation of a mode switching ring to an impact mode or a vibration drill mode and the rotation speed is held at high speed.

Abstract: A circuit, for controlling a vehicle having an electric motor, the circuit comprising throttle means operable to generate an output signal; adjuster means operable to modify the output signal to above a predetermined minimum level, and controller means operable to receive the modified output signal and derive an input signal for provision to the electric motor.

Abstract: The present invention has a communication connection means (21) which mutually connects communicatably control units (Ca, Cb) for individually controlling operations of robots (Ra, Rb) to constitute a network, input means (37a, 37b) which are respectively installed in the control units and input operation instructions of the robots, and timing signal generation means (69a, 69b). The control units are selectively set to any one of an independent function execution mode, a master function execution mode, and a slave function execution mode, and among the control units, the control unit (Ca) to perform a master operation is set to the master function execution mode, and the residual control unit (Cb) is set to the slave function execution mode, and by correcting a minimum interruption period (Ts(b)) of the slave side control unit (Cb), a control time (ta11, ta12, ta13) to the master robot (Ra) of the master side control unit (Ca) is delayed by a predetermined time (T) to perform the cooperative operation.

Abstract: A technique is provided for controlling operation of motors of different sized or ratings. Components used to apply and interrupt current to the motors may be shared in control devices for the different motors. The components may include contactors or circuit interrupters, and instantaneous trip devices. The components may be sized for the higher rated motors, and be oversized for the lower rated motors. Control circuitry permits the devices to be controlled in accordance with the characteristics of the particular motor to which the devices are applied, providing accurate circuit interruption while reducing the number of different components and component packages in a product family for the various motors.

Abstract: A cooling fan with built-in adjustable speed structure of the invention is provided herein. The cooling fan of the invention fan has built-in fan speed controlling parts installed inside, in addition, has a fan speed controlling interface, such as a knob or a keystroke, positioned on the fan frame for a user to directly adjust fan speed as needed without additional wirings to be connected. The invention can be used at any environment where needs a cooling fan.

Abstract: A method for controlling operations of power seats for a vehicle, comprises the steps of moving a first seat toward a second seat by a first reversible motor, causing a seat cushion of the first seat to be tipped up, by a second reversible motor, relative to a seat back of the first seat which stands up, sensing loads which are applied to the first and second reversible motors, once stopping the driving of the first reversible motor, when excessive load of the first reversible motor is sensed during the movement of the first seat toward the second seat, thereafter returning the first seat to a position at which the excessive load of the first reversible motor is not sensed and stopping the movement of the first seat, once stopping the tipping-up of the seat cushion, when excessive load of the second reversible motor is sensed during the tipping-up of the seat cushion, and thereafter returning the seat cushion to an original posture thereof and stopping the movement of the seat cushion.

Abstract: Disclosed is a pole-change type motor that provides a variable-speed (two-pole or four-pole type) operation system capable of reducing the load of the motor of the normal operation system and improving the cooling efficiency. In case of a quick operation, the motor switches over to the two-pole type according to the control of a relay section. At this time, the load of the motor is reduced by offsetting an abnormal magnetic field distribution formed due to the same polarity of adjacent main windings using compensation windings of an opposite polarity. If the quick operation is needed, the motor switches over to the two-pole type, and operates at a high speed to achieve the quick cooling. Then, if a standard operation is possible with the lapse of the predetermined time, the motor switches over to the four-pole type, and operates at a low speed to achieve an effective cooling.

Abstract: An electric motor comprises a stator 13, a rotor 11, windings on the stator, a sleeve 15 at one end of the motor for supporting or defining a bearing for the rotor and for attachment to a fuel pump. The sleeve 15 forms the sole means of aligning the rotor 11 and an impeller of the pump. The motor may be a brushless D.C. motor having sensors for sensing the position of the rotor relative to the stator, electronic circuitry for switching the current in the windings in response to outputs from the sensors so as to cause the rotor to rotate relative to the stator.

Abstract: A double pole, double throw switching arrangement for effecting dynamic rotor braking of user controlled operation of a reversible direct current servo motor. Two columns of stationary center and oppositely disposed side contacts are disposed in spaced parallel arrangement on the switch base. One side contact in one column is connected to the opposite side contact in the other column and to the B+ supply. The remaining side contacts in each column are connected to a ground strap having a portion disposed for wiping contact. A pair of commonly user actuated moveable contact members are disposed for sliding contact with each column of contacts. The center contact in each column is connected to one end of a separate forward and reverse motor coil. In the neutral position both motor coil contacts are grounded. User movement of the common actuator in one direction simultaneously causes the moveable contact members to keep one motor coil grounded and connect the other motor coil to B+.

Abstract: A control device for operating a machine is disclosed. The control device includes a joystick having a central axis and being universally moveable along a first and second axis in a plane perpendicular to the central axis, and a rotatable operator control station that houses the joystick. A joystick position sensor senses the position of the joystick and responsively generates a set of operator command signals corresponding to the displacement and direction of the joystick from the central axis in the first and second axis. A operator station position sensor senses the rotational position of the operator station and responsively generates a position signal. A controller receives the operator command and position signals, and responsively transposes the function of the joystick axis to correspond to the orientation of the machine.

Abstract: A three state switch detection circuit converts a three state input to a two-bit binary output readable by a micro-controller or other digital logic. The circuit utilized complementary NPN and PNP transistors having coupled emitters and coupled bases connected by a resistor. The collector of the PNP transistor is connected by a resistor to ground while a complementary resistor ties the collector of the NPN transistor to V.sub.BATT. Additional circuitry preferably converts the voltage output from the collectors to a suitable voltage level readable by the micro-controller or other digital logic device.

Abstract: In known electrically operated handheld machine tools, a potentiometer serving to control output must be balanced so that a desired tap resistance can be tapped at the potentiometer in a determined adjustment position of the potentiometer. To reduce manufacturing expenses, this balancing is effected without required additional structural component parts or costly additional devices.The potentiometer (20) has a resistance path (21) with which a slider (22) is in electrically conducting contact by pressing. The slider (22) can be actuated manually by an actuating member (15). The slider (22) and actuating member (15) have means (26) for adjusting their relative position with respect to one another after their insertion into a housing (11) of the handheld machine tool.