Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-05-31
1992-06-23
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
112277, 310152, 318258, H02K 1602, D05B 6918, H02P 324
Patent
active
051246066
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to a drive motor with a stator winding consisting of multiple phase windings, which phase windings can be switched over from continuous operation to positioning operation, and in particular to a main rotor intended for the continuous operation and an auxiliary rotor intended for the positioning operation, the auxiliary rotor being mounted together with the main rotor, on the motor shaft and arranged in the stator field.
BACKGROUND OF THE INVENTION
A driving motor with a stator winding that can be switched over from a single-phase or multi-phase network to a dc network, in whose stator field a squirrel-cage rotor and, together with it, a magnetic rotor mounted on the motor shaft are arranged, is described in French Preliminary Published Patent Application No. 23,86,184. The number of poles and the pole pitch of the magnetic rotor, designed with diametral magnetization direction, correspond to the stator winding poles that can be excited with direct current. The poles of the magnetic rotor are oriented toward the opposite poles of the stator winding when direct current flows through these poles.
The stator winding of the driving motor can be switched over from single-phase or multi-phase network to a direct-current network for different modes of operation, but the manner in which this is done is not specified.
Even though designing the driving motor with a magnetic rotor in which the number of poles and the pole pitch correspond to the stator winding makes it possible, for example, for a stator winding with three phase windings, which is common in asynchronous motors, to decelerate the magnetic rotor in dc operation and to hold it by the stator poles, in whose action zone the rotor poles come to a stop, it is impossible to stop the auxiliary rotor in a predetermined position with the means known from this preliminary published patent application in the case of such a stator winding.
A driving motor, whose stator has a winding consisting of two or more phase windings, is known from West German Offenlegungsschrift No. DE-OS 32,29,351. A plurality of rotors are fastened on the motor shaft one behind the other in the axial direction in the stator field, and at least one of these [rotors] is designed as a squirrel-cage rotor and at least one is designed as a synchronous rotor excited by permanent magnets. In the synchronous rotor, a soft iron yoke, which carries two half-ring-shaped permanent magnets, is arranged on a hub made of nonmagnetizable material.
Even though a similar design of the stator as well as the different rotors are described in this Offenlegungsschrift, the manner in which the stator winding is operated to drive the rotor is not mentioned at all.
West German Offenleguingsschrift No. DE-OS 19,47,721 describes a three-phase squirrel-cage motor, on whose shaft an armature disk rotor is arranged nonrotatably. The rotor is supplied with direct current via carbon brushes and is subject to an axially directed magnetic field of a second stator. Positioning is performed by the armature disk rotor when the speed of the motor shaft drops below an adjustable speed limit during deceleration.
It is disadvantageous in such drive motors that different stators are needed for the different modes, such as continuous operation or positioning operation, which makes the drive motor more complicated and expensive. The additional stator also increases the weight.
The construction and the mode of operation of a self-commutated converter is described in the book Elektrotechnik fur Maschinenbauer by H. Linse (Teubner-Verlag, Stuttgart, 6th revised edition, pp. 303 and 304). One of these self-commutated converters is represented according to FIG. 303.1 of this publication as the control unit of an asynchronous three-phase squirrel-cage motor. A dc intermediate circuit is supplied with constant voltage via a rectifier that is connected to a three-phase power net. A three-phase pulse invertor is connected to this intermediate circuit.
The required alternating current
REFERENCES:
patent: 3521097 (1970-07-01), Trinter
patent: 3749949 (1973-07-01), Muller
patent: 4367435 (1983-01-01), Bailey et al.
patent: 4626719 (1986-12-01), Foster
patent: 4920292 (1990-04-01), Albrecht et al.
Pfaff Industriemaschinen
Rebsch D. L.
Stephan Steven L.
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