SU978281A1 - Torque ac motor - Google Patents

Description

(5) TORQUE PERMANENT MOTOR MOTOR

CURRENT

The invention relates to electromechanical automation devices and can be used to create a research institute of a DC torque sensor for stabilization and control systems. A DC motor is known, containing a stator with sector permanent magnets oriented towards each other by poles of the same name, pole pieces located between with magnets, a toothed rotor with a coil, a toothed wheel made of a magnet of a soft material and a permanent magnesium that interacts with this wheel f 1} Momen s serration motor and gear nahrd are mutually in antiphase and are subtracted. However, this solution is a compromise, since the angular characteristic of the moment of serration has a complex shape, which is different not only for different types of engines, but can vary, for example, from sample to sample within one type of machine. In addition, when powering the core, i.e. during the formation of the driving moment, the moment developed by the gear wheel and the magnet will be parasitic with respect to the driving moment and reduce the output characteristics of the electric motor. Also known are electrical machines with reduced serration moment due to beveling of the rotor or stator grooves or by introducing into the working gap a thin ring of magnetically soft material bridging the inductor poles, as well as making machi 1 with a smooth rim f2}. However, these design solutions are associated with a decrease in the magnitude of the driving moment developed by the electric motor at the same core current value, and with stringent requirements on the amount of serrated moment, for example in power stabilization systems, the indicated torque losses can be significant.

The closest to the technical essence of the invention is a momemt DC motor containing a stator made in the form of two coaxially annular axially magnetized permanent Mi- nites oriented opposite to one another by the same poles consisting of alternating polarity sectors attached from external the ends to the shunt rings, and the roto with the winding placed in the grooves, the stator is equipped with pole lugs installed between the ma sectors of the thread, a non-magnetic sleeve on which Replaced the specified tips with magnets, and the rotor is located concentric to the stator Z

Due to the clearly pronounced serration of the rotor and the stator, this electric motor has a moment of serration, which can be reduced due to the expected bevel of the teeth of the core.

This, respectively, will reduce the amount of time developed by the electric motor when powering the box. The indicated developmental moment can be compensated by an increase in the current of the core. However, this reduces the reliability and service life of the electric motor, since such an additive increases the value of the current switched by the collector, especially considering that the switched power is proportional to the square of the current.

The purpose of the invention is to increase reliability by reducing the ripple torque.

This goal is achieved by the fact that an active shunt is inserted into a direct current electric motor consisting of a winding of a shunt and a cylindrical toothed magnetic core with radial teeth and a cylindrical back adjacent the end surfaces to the inner ends of the shunt ring and mounted on the non-magnetic sleeve, the shunt teeth, number which is equal to the number of poles of the stator, is made on a cylindrical back and is adjacent to the ends of the pole pieces opposite to the rotor, the shunt winding is made multi-section and each sec. The shunt winding qi is placed on the magnetic circuit tooth.

Figure 1 shows the electric motor, a longitudinal section; 2, the same cross-section.

The electric motor consists of a core (rotor 1, inside which the stator 2 is mounted concentrically to it. The rotor 1 is a laminated core 3, in the slots of which the winding k of the rotor 1 is laid.

The stator 2 is made in the form of coaxial and axially magnetized ring permanent magnets 5 and 6, oriented to each other by the same poles, made in the form of sectors 7 and 8 of alternating polarity, between which pole tips 9 of ferromagnetic material are mounted. From the outer ends of the magnets 5 and 6, shunt rings 10 and 11 are made of magnet of a flexible material, mounted on a nonmagnetic sleeve 12, on which is mounted a cylindrical toothed magnetic core 13 of the active shunt 1.

The magnetic core consists of a backrest 15, adjacent with its ends to the shunt rings 10 and 11, and radial teeth 16, on which sections 17 of the winding 18 of shunt 1 are placed. Fastening permanent magnets 5 and, for example, using glue or by soldering with low-melting solder with soldering temperatures up to 200 ° C, which does not cause irreversible changes in the magnetic properties of permanent magnets.

The device works as follows.

In the absence of current cor 1 and current in the winding 18 of shunt I, the magnetic flux of permanent magnets 7, the input to pole piece 9 is distributed into two circuits, one of which passes successively the working gap, core 3 cor 1, where, passed along the teeth and back cor, enters through the working gap in the pole tip 9 of the next in the tangential direction of the magnet 8, after which

Claims (2)

the passage magnet 8 through shunt rings 10 and 11 returns to magnet 7. Another circuit (shunt) in which the magnetic flux is FM, mine is working. A gap passes a tooth 16, the back 15 of shunt 1 and through rings 10 and 11 approaches a magnet 7 the ratio of these flows will be determined by the magnetic resistances of both circuits. Obviously, the dominant part of the flux passes through the second contour (q almost to having non-ferromagnetic sections and a smaller length of the flow path. Thus, when the current is de-energized, the jaggedness determined by the magnitude of the magnetic flux in the working gap is virtually eliminated and the electric motor does not introduce harmful disturbances into the system, for example, in the stabilization mode of the object. When the motor is operated as a torque sensor and the voltage is applied to the winding k, the winding 18 must be powered by direct current and the developed magnetic flux directed along the working flux Φ displaces the magnetic flux, and the electric motor is not disturbed. Since the powering of the winding 18 is static and this current does not pass through the collector, the required magnetomotive force can be provided with an increased number of turns, and not with the power supply current, therefore the consumption of the winding 18 of shunt 1 can be made insignificant. Thus, the proposed technical solution provides a reduction in the serration moment of the electric motor without an increase in the commutated current of disturbance of the engine operation mode, which leads to an increase in the reliability of the electric motor. The claims of the invention are a centrifugal dc electric motor comprising a gear rotor, in which slots a winding and stator are arranged, made in the form of annular axially magnetized permanent magnets, oriented to each other by opposite poles, consisting of alternating polarity sectors attached from external the ends to the shunt rings and supplied with pole tips installed between the sectors of the magnets, a non-magnetic sleeve on which the shunt rings are fixed, which is to increase reliability by reducing the ripple | rotating -f O ment, an active shunt is inserted, consisting of a winding and a cylindrical tooth of the magnetic circuit with radial teeth and a cylindrical back adjacent the face surfaces to the inner ends of the shunt rings and reinforced on the non-magnetic sleeve, the shunt teeth, the number of which is equal to the number of stator poles , are made on a cylindrical back and are adjacent to the ends of the pole tips opposite to the rotor, the shunt winding is made multi-section and each shunt winding section is placed on the magnetic circuit tooth. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2920261, cl. H 02 K 26/00, 1980. 2.Dubensky A.A. Contactless DC motors. M., Energie, 1967, p. 3- USSR Copyright Certificate of the USSR If i 85527, cl. H 02 K 23/0, 1973A. / / (ls .