RU2035826C1 - Asynchronous motor with open magnetic circuit - Google Patents

Abstract

FIELD: robotics. SUBSTANCE: asynchronous motor has field structure composed of core 1 and polyphase winding 2 and secondary element incorporating core 3 in which slots insulated conductive rods are dropped shorted on one side by common bus 4 and on other side by cylinder 5 mounted for turning about its axis. Cylinder 5 includes conductive and insulation parts, it is attached to secondary element with the aid of supports 6 and is provided with handle 7. Rotational speed of motor is smoothly controlled by closing two or more rods of secondary winding with conductive part of cylinder 5 having irregular section over length of circumference i.e. by changing resistance of secondary winding. EFFECT: expanded application field for drives of rectilinear and reciprocating motions. 2 cl, 5 dwg

Description

 The invention relates to electrical engineering.

 Known asynchronous motor with an open magnetic circuit [1] containing an inductor consisting of a core and a multiphase winding, and a secondary element including a core and a short-circuited winding.

 This engine has a limited range of speed control.

 Closest in technical essence to the claimed one is an asynchronous motor with an open magnetic circuit [2] containing an inductor consisting of a core and a multiphase winding, and a secondary element including a core, in the grooves of which are placed under each other, forming a vertical row of at least two secondary winding rods, closed on one side by a common busbar, and on the other hand by a cylinder mounted to rotate around its axis, and the cylinder contains an electrically conductive part, an external radius which is equal to the radius of the cylinder, and an insulating portion that is complementary to the electroconductive sectional circle and is rigidly bonded to it. This engine is selected as a prototype.

 The limited range of speed regulation is the disadvantage of the prototype.

 The extension of the limits of engine speed control is the purpose of the invention.

 The goal is achieved by the fact that in an asynchronous motor with an open magnetic circuit containing an inductor consisting of a core and a multiphase winding, and a secondary element comprising a core, in the grooves of which are placed under each other, forming a vertical row, at least two rods of the secondary winding, closed on the one hand, a common tire, and on the other hand, a cylinder mounted to rotate around its axis, and the cylinder contains an electrically conductive part, the outer radius of which is equal to the radius of the cylinder, and insulating According to the invention, the radial thickness of the electrically conductive part is made smoothly changing from zero to a value equal to the thickness of the tire closing the secondary winding rods from the opposite side of the cylinder.

 The goal is also achieved by the fact that in each groove of the core of the secondary element is placed at least one more vertical row of rods of the secondary winding.

 The implementation of the radial thickness of the electrically conductive part of the cylinder smoothly changing from zero to a value equal to the thickness of the tire that closes the secondary winding rods on the opposite side of the cylinder, the placement of at least one more vertical row of secondary winding rods in each groove of the core of the secondary constitute the novelty of the technical solution.

 Similar solutions in the field of linear induction motors in related fields of technology were not found. This suggests that the inventive engine has significant differences.

 In FIG. 1 shows an engine, a general view; in FIG. 2-5 show the winding of the secondary element at different positions of the closing cylinder.

 An asynchronous motor with an open magnetic circuit (Fig. 1) contains an inductor consisting of a core 1 and a multiphase winding 2, and a secondary element including a core 3, in the grooves of which are placed under each other, forming a vertical row of at least two rods of the secondary winding ( in Fig. 1), closed on one side by a common bus 4, and on the other hand by a cylinder 5 mounted for rotation around its axis, the cylinder comprising an electrically conductive part whose outer radius is equal to the radius of the cylinder, and insulation part, complementing the electrically conductive in section to the circle and rigidly bonded to it. The cylinder 5 is mounted on the rack 6 and is equipped, for example, with a handle 7 for rotation. The cylinder turning drive may be mechanical, electrical, hydraulic or pneumatic.

 In FIG. 2 the conductive rods 8 of the secondary winding are closed on one side by a bus 4, and the other side is adjacent to a cylinder 5, consisting of an electrically conductive 9 and an insulating 10 parts. In FIG. 2, all the rods 8 of the secondary winding are open, since they are in contact only with the insulating part 10 of the cylinder 5. In FIG. 3, only the lower rods 8 are closed on the “thin” side of the electrically conductive part 9 of cylinder 5. In FIG. 4, all the rods 8 of the secondary winding are closed by the electrically conductive part 9 of the cylinder 5, and the different (in height) rods are closed by parts of the part 9 with different cross sections and, therefore, with different electrical resistances. In FIG. 5 shows fully closed rods 8 of the electrically conductive part 9 of the cylinder 5, and the cross section of the closing sections along the height of the secondary winding is the same and equal to the cross section of the tire 4.

 The engine operates as follows.

 When the inductor winding 2 is connected to a three-phase voltage source, a traveling magnetic field is excited, crossing the secondary winding rods and inducing EMF into them. When only the lower rods are closed (Fig. 3), currents flow in them, interacting with a traveling magnetic field. As a result, a mechanical (starting) force is created, under the action of which the inductor begins to move. The magnitude of the starting force is higher than with the complete shorting of all the rods (Fig. 5). At the same time, the starting current of the motor decreases. Closing along two or more rods of the secondary winding with the electrically conductive part of the cylinder, which has a non-uniform cross section around the circumference and a variable, therefore, active resistance, smoothly regulates the speed of linear movement of the engine. In the nominal mode of operation of the machine, all the rods of the secondary winding are closed by the "thick" side of the electrically conductive part of the cylinder (Fig. 5). In this case, the engine operates with extremely high efficiency for it. Similarly, the engine works with several vertical rows of rods placed in each groove of the core of the secondary element.

 Compared with the prototype, the limits of engine speed regulation are increased and the smoothness of regulation is increased.

Claims (2)

 1. An asynchronous motor with an open magnet wire, comprising an inductor consisting of a core and a multiphase winding, and a secondary element comprising a core, in the grooves of which are placed under each other, forming a vertical row of at least two secondary winding rods closed on one side of a common winding bus, and on the other hand, a cylinder mounted to rotate around its axis, and the cylinder contains an electrically conductive part, the outer radius of which is equal to the radius of the cylinder, and an insulating part complementary to also conduct to a circle in cross section and is rigidly bonded to it, characterized in that the radial thickness of the cylinder is made conductive continuously variable from zero to a value equal to the thickness of the tire of the closing rods of the secondary winding on the opposite side of the cylinder.  2. The engine according to claim 1, characterized in that in each groove of the core of the secondary element is placed at least one more vertical row of rods of the secondary winding.

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