Siemens Aktiengesellschaft

Karl Schalk

Georg Kogler

Hans Kuhnlein

Manfred Liska

An electronic motor has a multi-pole external rotor and a multi-slot stator which is rotatable inside the external rotor. At least two magnetic field sensing elements are arranged in the vicinity of the external rotor and current supply to the stator windings is provided by a commutation device. The prior art stator was provided with obliquely set stator winding slots and involved a complicated winding technique. To eliminate this disadvantage and to be able to use slots lying parallel to the axis, the neutral field lines between each north and south pole of the external rotor are made to lie parallel to the rotor axis in the region of the magnetic field sensing elements and obliquely thereto in the region of the laminated rotor stack.

Electronic motor having a multi-pole external rotor

Input variables are varied cyclically and sequentially in the same direction until the sign of the differential quotient of the magnitude of the error with respect to time changes.

Circuit arrangement for forming a speed-proportional output voltage from

A brushless dc motor, a method for commutating the motor, and a commutation circuit for the motor are disclosed. The commutation signals which are to be supplied to the motor commutator are stored until released by a control signal. Thereupon, the stored commutation signal is supplied to the commutator and maintained until generation of the next control signal. In the meantime, the next commutation signal is stored awaiting the generation of the next control signal whereupon the next commutation signal will be transferred to the commutator. The brushless dc motor may be operated in a stepping mode and circuit means and a method are disclosed for generating the stepping signal and for operating the motor in the stepping mode.

Brushless direct current motor

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.

Direct current stepper motor with a permanent magnet rotor and

In a D.C. motor in which signals generated by an angular position transmitter control the commutation of the current flowing through the stator winding via a selection circuit containing Exclusive OR gates by means of which the polarity of the signals generated by the angular position transmitters can be reversed for the reversal of the direction of rotation, operating modes of 'Operation' and 'Braking' can be specified with only one command input for the Exclusive OR gates using an additional Exclusive OR gate.

Direct current motor with polyphase stator winding and electronic

A commutation device for controlling a brushless d-c motor is disclosed. The commutation device includes a regulator circuit for regulating current supplied to the motor by means of a transistor connected between the power source and a commutation circuit. A threshold hysteresis level detector controls the transistor. During current peaks generated in the commutation circuit, the hysteresis of the level detector is increased to provide stable operation of the regulator with different motors and operating voltages.

Control arrangement for a brushless D-C motor

For compensating the load dependence of the actual speed value in brushless d-c motors, a current pulse, by which a defined discharge of the smoothing capacitor is effected, is picked up by means of a shunt resistor and a diode.

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Nuremberg, Germany

Karl Schalk