SU1367109A1 - Single-phase stepping electric motor - Google Patents

Abstract

This invention relates to electrical engineering, single-phase stepper motors for software devices, time devices, and other discrete-action devices. The purpose of the invention is to improve the dynamic characteristics. The motor contains a stator with a magnetic core 2, an annular winding 1 and a permanent magnet 4 magnetized radially with alternating polarity and adjacent to the magnetic lead 2, and a rotor with clawed teeth 5. The goal is achieved by installing a friction gasket II between the end surfaces 10 and 6 stator and rotor. I il.

Description

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The invention relates to electrical engineering, to electrical steps of motors for software devices of time devices and other systems with a discrete electric drive.

The purpose of the invention is to improve the dynamic characteristics.

The drawing shows a half of the proposed engine, a longitudinal section.

The motor comprises a stator, the ring winding I of which is placed on the magnetic core 2, having a PM 3 and which is simultaneously the motor housing. A permanent magnet 4, magnetized with a radially alternating polarity, adjoins the муrm 3. The rotor with claw-shaped projections (teeth) 5 having a toothed pole equal to the double pole division of the magnet 4, is fixed with an end part 6 on the gear gear 7 and has the possibility of axial movement for a small distance through the gear gear 7, the torque is transmitted from the engine to the actuator. Axis 8 is pressed into the magnetic core 2 and remains stationary, with a washer 9 mounted on it, limiting the axial movement of the rotor. Between the end part 6 of the rotor and the end part 10 of the magnetic circuit 2 is placed friction gasket 11.

To ensure unidirectional rotation of the rotor, its teeth 5 are magnetically asymmetrical with respect to the poles of the permanent magnets 4.

The engine works as follows.

In the absence of current in the winding 1, the teeth 5 of the rotor, being displaced from the neutral, for example, due to magnetic asymmetry, fix the rotor. When a pulse is applied to the winding 1, a magnetic field arises around it, the magnetic flux of which at the beginning of the step processing is directed oppositely to the flux of the poles of the permanent magnet 4, and at the end of the step-by-step step processing согласно according to. Such a change in magnetic flux leads to

the change in the force of attraction in the axial direction of the rotor to the end part 10 of the stator acting through the gasket II, namely, at the beginning of the step this force is substantially less than at the end. This means that the frictional moment created by the force of attraction due to the gasket 11, at the end of the step, acts as a damping type of dry friction and thereby reduces rotor oscillations relative to the new stable position. Subsequent application of a current pulse of opposite polarity to the winding 1 leads to a repetition of the pattern, and the rotor of the motor moves one more step in the same direction. At this point, the engine cycle ends, and with the New impulse of the original polarity, everything repeats.

Thus, the introduction of a friction gasket I 1 in the proposed engine into the end gap between the stator magnetic circuit 2 and the rotor and its axial displacement allows for a damping type of dry friction on the shaft, increasing at the end of the pitch and effectively damping the rotor and thereby improving the dynamic performance of the engine compared with the known engines.

Claims (1)

Invention Formula A single-phase stepper motor containing a stator with a magnetic conductor, an annular winding and a permanent magnet magnetized radially with alternating polarity and adjacent to the magnetic conductor, and a rotor with claw-shaped teeth located between the annular winding and the permanent magnet with a gap relative to the end surface a magnetic circuit, characterized in that, in order to improve the dynamic characteristics, the motor is provided with a friction gasket placed in the gap between the rotor and the magnetic circuit, and mounted with the possibility of axial movement.