SU1644311A1 - Synchronous tachogenerator - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to simplify the manufacturing technology and increase the output voltage. The tacho generator contains a stator 1 with laminated magnetic core 2 and m-phase winding 3 with a diametrical pitch 4 rotor 4 with poles 6 and permanent magnets 7 magnetized in the tangential direction. From the end of the poles 6, 4p additional magnets 8 with axial direction of magnetization are installed along their edges. The polarity of the surfaces of the adjoining magnets 8 is the same polarity of the poles 6. The magnets 8 can be mounted movably with the possibility of moving in axial and tangential directions. from accurate and complex processing of the poles 6, which simplifies the technology. 1 hp f-ly, 3 ill.

Description

1A

The invention relates to low-power electric machines, in particular, synchronous machines with excitation from permanent magnets and a trapezoidal form of emf used as tachogenerators of direct current with a limited angle of rotation or the electric machine of a contactless tachogenerator of direct current with an unlimited angle of rotation.

The aim of the invention is to simplify the manufacturing technology and increase the output voltage.

FIG. 1 shows a synchronous tacho-generator of built-in (packageless) design, longitudinal section; in fig. 2 is a section A-A in FIG. one; in fig. 3 - curve forms of one half-wave phase EMF.

The tacho generator contains a stator 1 with a laminated magnetic core of 2 and 2 p-pole symmetric m-phase concentrated winding 3 with a diametrical pitch, a rotor 4 made of alternating radial poles 6 of magnetically soft material and permanent magnets 7, magnetized in a tangential 6 on a nonmagnetic sleeve direction. The tachogenerator can be made both in its own housing with bearing units, and in packageless design.

The rotor 4 is provided with 6 additional permanent magnet 8 with the axial direction of magnetization, located, for example, from the end along the edges of the poles. The polarity of the surfaces of the adjoining magnets 8 on the side of the end of the rotor 4 is the same polarity of the poles 6. Devices that mount the magnets 8 on the rotor 4 can be structurally implemented in different ways. For example, the magnets 8 can be independently glued to the rotor 4 at desired points. Or the magnets 6 can be assembled on a single non-magnetic frame (base), which is attached to the rotor 4 with studs, screws or other fasteners (Fig. 1 and 2, the mounting device is not shown).

In the case of assembling magnets 8 on a common frame, it is possible to ensure the movement of the entire magnetoelectric system in the axial AND / OR tangential direction and subsequent fixation on the rotor 4.

Tachogenerator works as follows.

When the rotor 4 rotates in the winding 3, an electromotive force (EMF) is induced, the shape of which, due to the scattering fluxes along the edges of poles 6, differs significantly from the trapezoidal one. This reduces the working angle at the top of the trapezium (curve A, fig. 3). When mounted on the end of the rotor 4 of the magnets 8, having the same polarity with the poles 6 of the rotor 4, the axial scattering flows

The flow of additional magnets 8 into the air gap, which leads to a corresponding increase in the magnetic induction in the gap along the edges of the poles 6 and its uniform distribution in the gap. As a result, the magnitude of the output voltage in the phase windings increases (curve B, fig. 3). If the fluxes of additional magnets 8 exceed the dissipation fluxes, an additional flux is created in the gap and the output voltage increases significantly, despite some deterioration in the quality of the output voltage curve. In this case, there is also an expansion of the working angle at the apex of the trapezoid (curve C, Fig. 3).

When using additional magnets 8, there is no need for accurate and complex processing of the poles 6 of the rotor 4 to provide the necessary ratio of the main flow and dispersion flows, which significantly reduces the laboriousness of manufacturing and improves the manufacturability of accurate tachogenerators.

The maximum accuracy of the tachogenerator due to the high stability of the output voltage along the top of the ramp, is achieved by moving additional magnets 8 both along the axis of the rotor 4 and in the tangential direction with subsequent fixation, since this is the most accurate scattering compensation for scatter

0 characteristics of additional magnets 8 and the main magnets 7 of the rotor 4.

The most effective use of the invention is in flat EMs with the ratio of the length of the active part to diameter 1.

Thus, the proposed tachogenerator is simpler to manufacture and has a higher output voltage compared to the known one.

Claims (2)

1. A synchronous tachogenerator containing and a stator with a 2p-pole symmetric m-phase concentrated winding with a diametric pitch and a 2p-pole rotor, made of alternating radial poles, made of a magnet of a soft material and permanent magnets located between the poles magnetized tangentially, or from permanent magnets, characterized in that, in order to simplify the manufacturing technology and increase the output voltage of the tachogenerator, it is equipped with 4p additional permanent magnets, magnetized nnym and axially spaced from the end edges of each pole adjacent the surfaces of them of the same name with them polarity. five 2. The tachogenerator according to claim 1, characterized in that the additional magnets are installed with the possibility of movement and fixation. A - A (turn / on) / 2 FIG. 2