摘要:
A motor device including a pair of motor units and a driven member meshed with rotary gears of the pair of motor units to drive the driven member, the motor units each including a rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction, a rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the rotary magnet together with the rotary magnet, and a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the rotary magnet and an inner magnetic pole that is arranged on the inner periphery of the rotary magnet and is opposed to the outer magnetic poles, the plural outer magnetic poles and the inner magnetic pole being excited by a coil.
摘要:
A riving current supply device for driving a stepping motor in micro steps supplies a driving current to the stepping motor for a predetermined time for each micro step, and after an elapse of this predetermined time, the driving circuit supplies a current which is smaller than the driving current and which generates a torque larger than the detent torque of the stepping motor.
摘要:
A voltage control device for controlling a driving voltage applied to a motor having a plurality of phases is provided with a switching circuit for changing the motor driving voltage from one voltage value over to another among a plurality of voltage values. The switching circuit is arranged to have a stop phase of the motor excited by a lower driving voltage than a rotation driving voltage in adjusting the stop phase at which the motor has been stopped.
摘要:
A driving circuit of a stepping motor for a floppy disk drive which drives the stepping motor by feeding control signals supplied from a control circuit through drivers in order to feed a carriage, wherein the circuit includes an all zero power circuit which performs logical operation of the feeding control signals and the electricity saving signal therein and outputs all zero signals to the drivers at the electricity saving time in spite of the feeding control signals in supply so that the electric current is completely cut off to be stopped flowing to the drivers and the stepping motor and the power voltage loss can be firmly deleted. Accordingly, the device can be driven in low voltage and the total system can be designed in small sizes and in battery driving operation.
摘要:
During the positioning of a dc stepper motor equipped with a permanent magnet rotor and electronic commutation device, an additional braking moment is enabled through a time delay stage which is triggered by the commutation signals, and/or the desired value of the nominal current regulator current is reduced to a desired holding current value at the end of the delay of the time delay stage.
摘要:
A stepping motor control device is provided with a stopping position determination section and a drive control section. The stopping position determination section determines whether a mover stopping position during the holding state is a stabilized phase or a semistable phase. When it is determined that the mover stopping position is a semistable phase during the holding state by the stopping position determination section, and the control state of the stepping motor transitions from the holding state to the standby state in which the holding of the mover is released due to a trigger signal from a device or the holding state persisting for a fixed time, the drive control section changes the mover stopping position to one of the stabilized phases adjacent to the mover stopping position during the holding state.
摘要:
A light assembly for producing scenographic effects comprising: at least one movable member; at least one electric motor coupled to the at least one movable member; at least one driving circuit, configured to drive the at least one electric motor and having a driving outlet connected to the electric motor; a driving inlet connected to the driving circuit to provide electric power and comprising a first driving terminal and a second driving terminal; and a supply inlet configured to receive electric power from an electric power supply; and a braking system configured to restrain unwanted movements of the movable member and comprising a switch having a first switching terminal and a second switching terminal respectively connected to the first driving terminal and to the second driving terminal; wherein the switch is configured to switch between a first operating configuration, in which the first switching terminal and the second switching terminal are disconnected; and a second operating configuration, in which the first switching terminal and the second switching terminal are connected.
摘要:
A scanning monochromator system which uses a directly coupled stepper motor to drive a spectral-dispersion element. The spectral-dispersion element is directly coupled to the output shaft of the motor. The movement of the motor is controlled with an electronic circuit that controls the motor winding current. The circuit includes a power driven section, a pulse-width modulator section and a computer section. The power driven section switches electrical current through the motor windings and can produce a variable pulse-width ranging from 0 to 100 percent modulation. The pulse-width modulator section accepts values from the computer section and converts these values into variable pulse-width signals for use by the power driver section. The computer section supplies values to the pulse-width modulator section based upon requirements for the motor movement and position. The required motor position is determined by the type of spectral-dispersion element and the desired wavelength selection of the monochromator.
摘要:
A surgical system, adapted to operate with at least one surgical device, has a handpiece containing a motor which is adapted to receive the surgical device. The surgical device is driven through a continuum of positions by the motor output shaft. A controller microprocessor controls the operation of the system. The motor has sensors for generating electrical position signals and the controller is responsive to input signals for defining both a stop position and a reversal position for the surgical device. As a result, the controller initiates operation of the surgical device at the so called stop position and stops operation of the surgical device so that it comes to rest substantially at the stop position. In an oscillatory mode of operation, the controller also forces reversals to occur solely at a reversal position dictated by the system, under the control of the user. In connection with an arthroscopic cutting device, the control enables the surgeon to control, for example, the opening of the aperture through which tissue and fluids are removed from the surgical site during the reversal and start/stop conditions.
摘要:
The device comprises transistors (T1, T2, T3, T4) each connected in series with one of the phases (.phi.1, .phi.2, .phi.3, .phi.4) of the stator of the motor in order to control its power supply by an electrical energy source (+V.sub.BAT). Means (D1, D2, D3, D4) are provided for detecting the simultaneous stopping of conduction in all of the phases and to then control the return to conduction of one of the phases (.phi.4), by an appropriate control of a transistor (T5), in order to lock the rotor with a predetermined holding torque established by this phase. Thus, in the case of a failure of the control of the phases of the motor, the motor remains substantially immobile even if it is subject to the action of a parasitic or resisting torque.Application to a motor for controlling the butterfly valve for the gases of an internal combustion engine.