Spinning turbine having speed-controlled brakeable electric drive motor

Claim 1

A brakeable speed-controlled electric drive motor for a spinning turbine comprising a commutatorless DC motor having a rotor, a stator, a stator field, a reversed-current circuit for reversing the stator field of the motor for braking a spinning turbine, a stator circuit including control means dependent upon the rotor speed for automatically deenergizing the stator circuit after braking to a given speed of rotation, a DC voltage source having a first terminal of one polarity and a second terminal of the opposite polarity and wherein the stator has a stator winding having four partial winding branches mutually displaced electrically by 90* Y-connected at one end thereof and connected at the one end thereof to the first terminal of the DC voltage source, and the stator circuit comprises a plurality of power transistors having emitter, collector and base electrodes and collector-emitter paths, the other end of each of the partial winding branches being connected to the second terminal of the DC voltage source via the collector-emitter path of a corresponding one of the power transistors, a plurality of first input transistors having emitter, collector and base electrodes, a plurality of second input transistors having emitter, collector and base electrodes, first and second Hall effect generators having Hall voltage electrodes and control current electrodes, and a plurality of first collector resistors, the partial winding branches of each pair of winding branches being displaced electrically by 180* and the corresponding power transistors of the partial winding branches being in control connection with a corresponding one of the Hall effect generators via corresponding first and second input transistors, each Hall voltage electrode of each Hall effect generator being connected to the base electrode of a corresponding one of the first input transistors and to the base electrode of a corresponding one of the second input transistors, the collector electrode of each first input transistor and the collector electrode of each corresponding second input transistor connected to the Hall voltage electrode of the corresponding Hall effect generator other than that to which the first input transistor is connected being connected to the base electrode of the power transistor connected to the corresponding one of the partial winding branches and being connected to the second terminal of the DC voltage source via a corresponding one of the first collector resistors, a common first connecting line connected to the emitter electrodes of the first input transistors, a common second Connecting line connected to the emitter electrodes of the second input transistors, a control transistor having emitter, collector and base electrodes, a first emitter resistor, a first base resistor, switch means selectively connecting the first and second connecting lines to the collector electrode of the control transistor, the emitter electrode of the control transistor being connected to the first terminal of the DC voltage source via the first emitter resistor and the base electrode of the control transistor being connected to the first terminal of the DC voltage source, speed control means having an output connected to the base electrode of the control transistor, and rotor speeddependent control means having an output connected to the base electrode of the control transistor when the stator field is reversed.