Asulab S.a.

Smh Management Services Ag

Les Fabriques D'assortiments Reunies

Roger Buhler

Christian Faivre

The invention concerns a method for controlling a continuous rotation miniature motor including a rotor carrying permanent magnets and a stator carrying at least one coil in which an alternating induced voltage is generated when the rotor rotates, this method consisting in maintaining the rotation of said rotor by successive pulses (102) supplied, in respective half periods of the induced voltage (U.sub.i), before the induced voltage reaches a maximum absolute value in each of these half periods. In particular, the time interval (t.sub.1) between a passage through zero of the induced voltage and the beginning of a maintenance pulse (102), provided in the half period following said passage through zero, is constant.

Method for controlling a continuous rotation miniature motor

A drive device comprises a gearbox (1) of the motorcycle type in which a selector shaft (10), via its angular position, enables the gear ratio in which the gearbox will be engaged to be determined. The device is provided with an electronic control device (DCE) designed to automatically place the gearbox (1), or in other words the selector shaft (10), in the position corresponding to the gear selected by the driver or automatically determined as a function of the speed of the vehicle. The electronic control device (DCE) comprises, in particular, means for down-shifting gently despite the absence of a synchronizer in the gearbox.

Motor vehicle drive device

An energizing circuit for an electric motor, driving a clockwork of a timepiece, includes a stator coil coacting with one or more magnet pairs on an associated rotor whose periodic alignment with the coil induces therein a train of monitoring pulses with a frequency proportional to the motor speed. The monitoring pulses are amplified and fed back to the coil, as driving pulses, through a coincidence gate which is opened or closed under the control of a speed-sensing network including a crystal-controlled oscillator whose output wave, stepped down in a frequency divider, is a series of timing pulses fed to a pulse counter which is reset by the monitoring pulses and whose count, therefore, varies inversely with the motor speed. Through a logic circuit and a pair of cascaded flip-flops, the transmission of driving pulses to the coil is inhibited when the count falls short of a lower limit -- indicative of excessive motor speed -- but is allowed to proceed when the count surpasses an upper limit representing an insufficiently low speed. In the range between these two limits, the counter blocks or unblocks the transmission of a driving pulse in dependence upon the relative phasing of the monitoring pulses from the motor and a sequence of reference pulses of fixed cadence, equal to a fraction of the timing-pulse frequency, derived from the frequency divider. The monitoring pulses and the reference pulses are supplied through an anticoincidence network, including a pair of binary memories, to a reversible pulse counter delivering a phasing signal to the logic circuit.

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Le Locle, Switzerland

Roger Buhler