Abstract: An electric-powered personal transport vehicle with a board to support a weight of a user and one or more wheels driven by one or more electric motors is discussed. The electric motors are powered by one or more batteries. A throttle has a thumb wheel speed controller on a handlebar. The thumb wheel speed controller has a horizontal manipulation between accelerate, neutral, and brake input positions such that pressing the thumbwheel speed controller in a vertical direction will not result in an unintentional acceleration or braking.

Abstract: A stapling end effector includes an anvil assembly having a distal end and defining a plurality of staple forming pockets, and a cartridge assembly pivotal relative to the anvil assembly such that the end effector is movable between open and clamped positions. The anvil assembly supports a plurality of staples corresponding to the plurality of staple forming pockets. The surgical stapling instrument further includes a sensing tip disposed on a distal end of the end effector. The sensing tip is formed of a flexible material and includes at least one sensor for measuring at least one mechanical property. The mechanical property may include force, pressure or torque.

Abstract: A device handle is disclosed for grinding substances inside a body lumen, the device handle comprising: a high-speed drive source configured to rotate a treatment member connected to a distal end of a drive shaft; and a low-speed drive source connected to a revolution shaft, and wherein the revolution shaft is configured to cause the treatment member to move about a central axis of the revolution shaft, and wherein the central axis of a proximal portion of the revolution shaft is different from a central axis of the treatment member.

Abstract: An endoscope power supply system includes an endoscope including an imaging unit that images an object, a housing apparatus to which the endoscope is detachably connected, a plurality of power source units that are provided in the housing apparatus and configured to output electric power different from one another, switches each provided in an output stage of each of the power source units of the housing apparatus and formed of two FETs that are back-to-back connected, and a controller that is provided in the housing apparatus, selects a power source unit necessary to operate the endoscope from the power source units, and controls the switches to output electric power generated by the selected power source unit to the endoscope.

Abstract: A shell structure for a thyristor trigger unit comprises an integrally-formed shell body with a holder and a cuboid structure, and a side plate. The cuboid structure is a cuboid with an opening in its front where an open face is formed at the front opening of the cuboid. The cuboid further includes a rear panel, a left panel, a right panel, an upper panel, and a lower panel. The holder includes a square retaining plate and two triangular stiffener plates. The square retaining plate is formed by a bottom panel extending towards a side of the left panel in a long side direction of the cuboid while the triangular stiffener plates are fixedly connected between the square retaining plate and the left panel. The side plate is mated with and detachably mounted on the open face to produce a sealed 6-face cuboid structure by sealing off said open face.

Abstract: An introduction device applies urging force linearly generated by a spring to a nut portion screwed to a drive shaft to convert the urging force to the rotation direction of the drive shaft. This conversion returns an RL operation dial provided at the end of the drive shaft in a direction opposite to the rotation direction in which the RL operation dial is operated, and then returns the RL operation dial to an original neutral position.

Abstract: A power tool comprises a housing, a direct current motor arranged in the housing, a speed reduction mechanism coupled to a shaft of the motor, a tool head driven by the speed reduction mechanism, a first direct current power source, and a switching device. The motor comprises a common brush, a high speed brush and a low speed brush which are in sliding contact with a commutator. The switching device is configured to selectively connect the common brush and the high speed brush with the power source to operate the motor in a high speed mode and to connect the common brush and the low speed brush with the power source to operate the motor in a low speed mode.

Abstract: A fan control system includes a controller that is coupled to a plurality of fan couplers. A computer-readable medium is coupled to the controller and includes a first fan identification corresponding to a first fan, a second fan identification corresponding to a second fan, and at least one fan property associated with each of the first fan identification and the second fan identification. The controller is operable to monitor at least one operating parameter of each of the first fan and the second fan when the first fan and the second fan are coupled to a respective fan coupler. The controller is further operable to use the at least one fan property associated with each of the first fan identification and the second fan identification and the at least one operating parameter of each of the first fan and the second fan in order to adjust a speed of the second fan relative to a speed of the first fan.

Abstract: An apparatus, system, and method are disclosed for controlling fan speed. A power sensing module senses input voltage and current of a power supply. The power supply includes one or more stages and regulates at least one output bus. A power calculation module calculates input power from the input voltage and the input current. A temperature sensing module senses an ambient temperature and/or a temperature at a component cooled by a fan. A fan speed calculation module calculates a fan speed signal for the fan. The fan speed signal is a function of the input power calculated by the power calculation module and the sensed temperature sensed by the temperature sensing module for at least a portion of a fan speed range. A fan speed transmission module transmits the fan speed signal to the fan and adjusts a fan speed based on the fan speed signal.

Abstract: An AC motor speed controller includes a plurality of capacitors that may be selectively switched, by means of controllably conductive switches, into series electrical connection with an AC motor and an AC voltage source to control the speed of the motor. To change the speed of the motor, a control circuit renders a first switch conductive, in response to a first detected AC voltage zero crossing, to charge a first capacitor to a predetermined voltage. The control circuit then renders a second switch conductive, in response to a subsequent second detected AC voltage zero crossing, to charge a second capacitor to the predetermined voltage. The control circuit then renders both switches simultaneously conductive at a predetermined time after a subsequent third detected AC voltage zero crossing. The capacitors will thereby be charged to the same voltage prior to being switched into series with the motor, thereby resulting in reduced acoustic noise when changing motor speeds.

Abstract: The invention teaches a speed control system for a brushless DC motor for a ceiling fan, comprising a power circuit 1, a microprocessor circuit 2, a power drive circuit 3, a speed regulation circuit, and a brushless DC permanent magnetic motor 5, wherein the input terminal of the power circuit 1 is connected to the output terminal 101 of an AC power source, the output terminal of the power circuit 1 serves to power the various circuits, the output terminal of the microprocessor circuit 2 is connected to the input terminal of the power drive circuit 3, the output terminal of the power drive circuit 3 is connected to the coil windings 501 of the brushless DC permanent magnetic motor, and the output terminal of the speed regulation circuit is connected to the input terminal of the microprocessor circuit 2. The speed control system of the invention provides the advantages of low energy consumption, low noise during the operation of the motor, and a stable operation at low speeds.

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 motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a motor, thereby enabling to activate the motor at any one of a high speed and a low speed.

Abstract: A processor for controlling a sensorless, brushless DC motor is disclosed comprising a first output for providing a control signal to a potentiometer controlling the speed and voltage of the DC motor. The processor also includes a second input for receiving a back-EMF voltage from an open phase of a three phase winding. The processor determines a digital error signal from the back-EMF voltage and generates a control signal responsive to the digital error signal. The control signal decreases the speed of the motor when the digital error signal is in a first range. The processor decreases both the speed and voltage of the motor when the digital error signal is in a second range. The processor increases the speed of the motor when the digital error signal is in a third range. The processor increases both the speed and voltage of the motor when the digital error signal is in a fourth range.

Abstract: The invention concerns a motor controller for a motor with a feedback potentiometer, preferably for central air valve actuation. In the field of climate control, for example for utility vehicles and motor vehicles, the air ducts in heating, air conditioning and/or ventilation systems have valves to control the flow of air or water. These valves are adjusted either mechanically, e.g. by Bowden cables or flexible shafts, or using motors. It is proposed that a continuous rotation potentiometer be employed as a feedback potentiometer and specially designed control electronics be used to control a motor with the continuous rotation potentiometer. In the control electronics for the motor controller, an angular difference between an adjusted control potentiometer and the motor feedback potentiometer is determined in order to determine therefrom the shortest adjustment path to the chosen setpoint position for the motor when the angular difference is greater than 180 degrees.

Abstract: A system for controlling a brushless direct current (BLDC) motor includes a power supply having a controllably alterable voltage output, and a controller in electrical communication with the power supply and the motor. The controller receives the voltage output of the power supply and can provide a pulse-width-modulated input voltage to the motor. Additionally, the controller can measure an average input current to the motor and a speed of the motor and thereafter alter the voltage output of the power supply based upon the average input current to the motor and the speed of the motor. In a further embodiment, the system can include an acoustic coating disposed about an outer surface of the motor and the controller.

Abstract: The method of setting rotation speed of a drive motor of a work machine, in which the drive motor has a device for control of motor rotation speed and for control of the travel speed independently of the rotation speed, includes setting the rotation speed of the drive motor to be constant during working operation and setting the rotation speed of the drive motor during transport or road travel of the work machine automatically according to the set travel speed of the work machine or according to whether the work machine is in working operation or in transport or road travel. A suitable apparatus is described for performing the method.

Abstract: An air purifier unit having a mounting assembly that allows the mounting of the unit underneath a cabinet or on any like flat surface. A cartridge filter is provided and easily ejected or replaced through a filter door in the face of the enclosure. A motor speed indicator circuit enables the user to visually monitor the speed of the motor and blower. Air is drawn into the housing of the unit through an intake opening on the bottom surface of the housing, forced through a cartridge filter, and expelled out an air exhaust opening.

Abstract: A direct current motor having a primary armature winding, a secondary armature winding and a switching circuit adapted to selectively energize the primary winding and the secondary winding to achieve three-speed motor operation is disclosed. The system is adapted to achieve a high speed of the motor by energizing only the primary winding, a medium speed of the motor by energizing only the secondary winding, and a low speed of the motor by energizing both the primary winding and the secondary winding. The system also includes a voltage source providing a direct current level voltage with respect to an electric ground and a switching circuit adapted to operate the motor. The switching circuit is coupled to the voltage supply for energizing the primary winding only to achieve a high speed, energizing only the secondary winding to achieve a medium speed, and energizing both the primary winding and the secondary winding in series with each other to achieve a low speed.

Abstract: A motor control circuit for a power tool includes a function switch which has a first battery contact, a speed control contact, a bypass contact and, a second battery contact connected in that order in a line. The function switch also has a movable contact which sequentially connects the first battery contact to the bypass contact, the speed control contact to the second battery contact, and the bypass contact to the second battery contact. A solid state switch has conduction path connecting the speed control contact to the second motor terminal wherein the conduction path is controlled in response to an oscillator signal.

Abstract: An adjustable speed control for use on a children's ride-on vehicle, where the speed control includes a switch assembly interposed between the battery and the motor of the vehicle. The switch assembly is selectively operable to connect the battery to the motor in one of a number of speed configurations, including a first speed configuration and a second speed configuration. An actuator is connected to the switch assembly and manipulable by a user to allow the user to operate the switch assembly to select a particular speed configuration from among the number of speed configurations. In one embodiment, a diode is disposed in series between the motor and battery in one of the speed configurations to provide a relatively current independent voltage drop between the motor and the battery. In an alternative embodiment, a childproof cover is disposed proximal to the actuator.

Abstract: A direct current (DC) electric motor is shifted between higher and lower operating speeds in response to motor operating conditions to prevent motor stalling, overheating and burnout. Switches are performed between two or among more than two operating curves defined for the DC motor with switches preferably taking place approximately at points of intersection of the operating curves. The high or higher speed curve typically results from inducing inefficiency into the motor such that continued operation along the high or higher speed curve can lead to motor stalling and even burnout. At or near the intersection points of motor operating curves, operation is switched from the high or higher speed operating curve to a lower speed, higher efficiency operating curve such that motor current is immediately reduced for the same motor speed and torque. If the motor is able to once again operate along the high or higher speed curve, a switch-back is made at or near the point of intersection.

Abstract: An electric tool including a variable speed switch assembly including a potentiometer having a central rotatable member defining a bore with a noncircular cross section and a molded plastic speed control wheel housing the potentiometer. The speed control wheel includes a central post with a cross section corresponding to the cross section of the central potentiometer bore such that the central post can be housed in the central bore in only one relative position with respect to the central rotatable member. The variable speed switch assembly also includes a switch cover having projections which snap into designated holes provided in a circuit board such that the switch cover and the circuit cannot be incorrectly assembled. The switch cover includes a stop member that extends into a semi-circular recess in the speed control wheel to provide mechanical stops so that rotational movement of the speed control wheel corresponds with the range of the potentiometer.

Abstract: A power tool such as a hand held vacuum cleaner, has a housing and nozzle. The housing mounts a motor and switch carrier. A battery pack powers the motor. The electrical arrangements comprise conductors punched from a single strip and fixed in guides formed on the carrier. Terminals of the motor and battery are pressed through slits in some conductors. The conductors pass into tracks formed on a tray of the switch. A mask is positioned on the tray to expose the conductors in discrete switch positions of slide connectors mounted in a switch slide slidably mounted on the tray. A mask (78) is positioned on the tray to expose the conductors in discrete switch positions (A, B, C) of slide connectors (68) mounted in a switch slide (64) slidably mounted on the tray.

Abstract: An electrical implement having a bypass mechanism for controlling a variable speed motor is disclosed. The implement includes a tool, a variable speed electrical motor activatable for driving the tool, a housing supporting the motor and tool, and a control knob for controlling the speed of the motor. The control mechanism includes an on/off switch and a variable speed control circuit. The variable speed control circuit includes a variable resistance rheostat and bypass switch. The control knob controls whether the bypass switch causes current to bypass the rheostat to operate the motor at a predetermined speed or else whether the resistance in the rheostat is variable to change the speed of the motor. The control mechanism includes a cantilevered beam engageable by the control knob to operate the bypass switch. The cantilevered beam is sufficiently flexible to allow for large deflections while placing only limited force across the bypass switch.

Abstract: A speed servo-control apparatus is provided for use in combination with a walking-running exercise machine including a moving belt on which a user may walk or run and a direct current drive input for controlling the speed of the moving belt. The apparatus has a frame bracket and a control unit rotatably mounted to the frame bracket, and is provided with an assembly for mounting the frame bracket at a predetermined position with respect to the machine. The apparatus is also provided with a cord assembly having two opposite extremities, one of the extremities being operatively connected to the control unit and the other of the extremities being attachable to the user of the apparatus so as to rotate the control unit in a given direction when the cord assembly is pulled forward.

Abstract: A speed control device for a DC motor controls the rotational speed of the DC motor through adjustment of a duty cycle of a semiconductor switching element. The rotational speed to be obtained is determined by an amount of operation of an operation member. A second contact switch is arranged to bypass the semiconductor switching element and is turned on to eliminate influence of the internal resistance of the semiconductor switching element. A power source contact switch is provided between a power source and the DC motor and is turned on and off through operation of the operation member.

Abstract: The process of controlling rotational speed of an electric motor of an electric hand tool, including providing an electric motor of an electric hand tool with a rotational speed control comprised of displacement means for providing displacement in response to manual operation of the electric hand tool selected from the group consisting essentially of a linear displacement device for providing linear displacement (s) and an actuating dial for providing arcuate displacement (S); an elastic membrane to which the displacement means is articulatedly connected so that during displacement of the displacement means the elastic membrane deforms as a function of the displacement; actuating means comprising a sensor element coupled to the elastic membrane so that the sensor element produces an electrical output variable as a function of the deformation of the elastic membrane, the sensor element being selected from the group consisting essentially of a Hall sensor, an inductive sensor, and a sensor switch; and an electr

Abstract: A programmable speed selector is provided for automatically adjusting the speed of a Reeves drive. The speed selector includes an output shaft which attaches to the adjustment crank shaft of the Reeves drive and a reversible motor having a drive shaft for driving the output shaft. Push button switches are provided to selectively energize the motor so that the drive shaft can be manually rotated to a plurality of different rotational positions. A sensing device is provided for sensing the direction and number of revolutions of the drive shaft during positioning thereof and a micro-controller is provided for learning the rotational positions and storing them into selected memory locations. Once programmed, the user may select one of the preset speeds on a key pad and the device will automatically control the motor to position the drive shaft in the desired position thereby automatically adjusting the reeves drive to a desired speed.

Abstract: In the pedal assembly of a sewing machine drive device, a potentiometer operating member is guided by a mounting stand secured to the pedal stand, to control the slide shaft of a direct acting type potentiometer, and a speed changing pedal including a depressing board to depress the potentiometer operating member with its one end portion is coupled to the pedal stand with the other end portion. When the speed changing pedal is stepped on, a signal is outputted to change the speed of rotation of the sewing machine according the movement of the pedal thus stepped on. The pedal stand may have an opening with which the pedal is swingably engaged. In addition, signal pedals may be arranged in alignment with the speed changing pedal with the same mounting means provided at the position of those pedals, so as to allow the pedals to swap in position with one another.

Abstract: A dc motor wherein a driving force thereof can be used effectively with a simple and compact mechanical construction and a motor controlling system which can control such a dc motor to be driven efficiently. The motor comprises at least two coils, and change-over means for changing electric connection of the coils to change over the motor, when power is selectively supplied to the coils, between a first mode in which the torque produced is relatively high and the rotational frequency is relatively low and a second mode in which the torque is relatively low and the rotational frequency is relatively high. The motor controlling system includes selecting means for automatically selecting one of the first and second modes to control the change-over means is response to a given condition of the motor.

Abstract: A battery operated device includes a circuit connecting a DC motor (22) and a battery (9) made up of a plurality of cells (10, 11, 12) connected in series with a two-pole switch device (23) including a first switch (24) and a second switch (25). The DC motor (22) receives a lower battery voltage from an intermediate tap (17) of the battery through a first switch (24) and it receives the full battery voltage through an end tap (15) when the second switch (25) is closed so that the motor can be operated at two speeds. Further, elements are provided for preventing a short circuit between the intermediate tap (17) and the end tap (15) of the battery (9) when the second switch (25) is closed. As a result of this switching arrangement, an extensively interrupted-switching is available, so that practically no power lapses occur when switching over from one speed to the other.

Abstract: A motor drive having a sensing input for sensing fault conditions and a speed control input for receiving a speed control signal. The variable speed motor drive is suitable for being powered by a power supply coupled to a supply input and controls motor speed in a variable speed motor based on the speed control signal such that the motor speed corresponds to the level of the speed control signal. The disclosed motor drive includes a power interrupter, coupled between the supply input and the variable speed motor, for controllably interrupting power to the motor as well a a drive controller coupled to the motor drive for monitoring the sensing input and causing the power interrupter to interrupt power when a fault condition occurs. The drive also provides that speed control signal to the speed control input at a level which stops the motor when a fault condition occurs.

Abstract: A motor controller for use on a treadmill to prohibit the treadmill from operating at a high speed immediately upon energization. The controller uses solid state circuitry in a motor speed circuit with a speed setting potentiometer set by the user. The system is adapted so as upon energization a minimum speed is initially achieved. The results are obtained with the interaction of a buffer circuit, solid state circuitry, and an SCR motor speed control circuit.

Abstract: AC power supply is converted to DC by a rectifier circuit. The DC is stepped up by a step-up chopper circuit. The output of the step-up chopper circuit is smoothed by a smoothing circuit. The output of the smoothing circuit is input to an inverter via a current detecting circuit and a voltage detecting circuit. A synchronous motor is connected to the inverter. When the speed of the synchronous motor is judged to be in a high speed region based on the output signal of the voltage detecting circuit, the first speed control apparatus operates the interrupting control of the switching element of the step-up chopper circuit in such a manner that a deviation speed between an instruction speed signal to the motor and the detected speed of the motor reaches to zero.