Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Having electrical synchronizing interconnections
Patent
1981-12-07
1983-12-13
Truhe, J. V.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Having electrical synchronizing interconnections
318135, 318 38, 310 12, H02K 4103
Patent
active
044207123
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electric drive, and particularly concerns an electric drive for synchronous displacement of mechanically independent machine assemblies moving along equidistant trajectories. Hereinafter the term "mechanically independent machine assemblies" also means such running parts of a machine, the mechanical connection between which can be neglected due to its insufficient rigidity.
BACKGROUND ART
An important requirement to the electric drive of the above type consists in the maintenance of synchronism of displacement of suporting members moving along equidistant trajectories. Numerous attempts to meet this requirement are known.
Thus, known in the art are electric drives for synchronous rotation of mechanically independent shafts (M. G. Chilikin et al. "Teoriya avtomatizirovannogo elektroprivoda"--"Theory of automated electric drive", Moscow, "Energiya", 1979, pp. 538-557). In the above electric drives each shaft is mechanically coupled with a separate synchronous or asynchronous electric motor. Windings of rotors of these motors are electrically connected therebetween.
In the case of a lag of one of the shafts, which would result in the angular deflection of the supporting members, a corresponding motor produces an additional torque to eliminate misalignment, and consequently to a certain degree prevent the angular deflection of the supporting members.
Among the above specified electric drives, the most typical is an electric drive including two d.c. electric motors located equidistantly and electrically connected therebetween (V. P. Andreev, Yu. A. Sabinin. "Osnovy elektroprivoda"-"Fundamentals of electric drives", Moscow-Leningrad, Gosenergoizdat, 1963, pp. 674-675). Each of these motors includes a stationary former of magnetic field, a movable portion disposed within this magnetic field, an excitation winding, a sectionalized armature winding, and a collector with brushes, commutating the sections of the armature winding.
To synchronize the rotation, d.c. electric motors are provided with additional contact rings whereto are connected three symmetric points of the armature winding, shifted relatively one another by 120 electrical degrees. The rings of these motors are electrically connected therebetween. From the viewpoint of the contact rings, said electrical machines operate like placed-in-parallel synchronous generators. In the case of occurrence of a misalignment, a circulating current starts flowing over the armature windings, due to which fact there occur synchronizing torques retaining the machines in the synchronous rotation mode. However, these torques decrease with decreasing speed of rotation of the armatures. The speeds of rotation of the armatures being low, when the electromotive force induced in the armature windings is practically equal to zero, the synchronizing torques also practically vanish, which fact makes inexpedient the use of such an electric drive for shifting lengthy gantries of e.g. thermal cutting machines, where in the displacements at very low speeds, of the order of tens of millimeters per minute, the main processing operation modes are practiced.
DISCLOSURE OF INVENTION
The invention is directed to the provision of an electric drive for synchronous displacement of mechanically independent machine assemblies moving along equidistant trajectories, which, due to the change in the concept of designing the electric motor, ensures an increase in the synchronism of shifting mechanically independent assemblies of processing machines, and consequently elimination of their angular deflection in the course of shifting.
The object set forth is attained by that in an electric drive for synchronous displacement of mechanically independent machine assemblies, comprising at least two d.c. electric motors electrically connected therebetween, each including a stationary former of magnetic field, a movable portion located within the zone of action of this magnetic field, an excitation winding, active conductors of sections of an armature
REFERENCES:
patent: 4151447 (1979-04-01), von der Heide et al.
patent: 4249114 (1981-02-01), Popov et al.
patent: 4348618 (1982-09-01), Nakamura et al.
Belikov Viktor T.
Bushtian Leonid V.
Ivlev Anatoly D.
Shvets Vladimir I.
Sitnichenko Valentin M.
Evans A.
Odessky Ordena Trudovogo Kraskogo
Truhe J. V.
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