SU1575270A1 - Electric spindle with magnetic suspension of rotor - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used in high-boring devices. The goal is to increase reliability and increase rotational speed. The electric spindle includes a housing 1 with a stator 2 installed in it, a shaft 11 with a rotor 12 mounted in active magnetic supports — axial and radial. At the shaft end, there is a recess where a ferromagnetic cup 19 is installed, in the inner cavity of which an inductive displacement sensor 21 is placed. 1 il.

Description

one

(21) 4410833 / 24-07

(22) 08-1088

(46) 06/30/90. Bksh-. 24

(71) Pskov branch of the Leningrad Polytechnic Institute named after IM „I, Kalinina

(72) N.V.Hmshko, Vo Vo Andreev, A „M„ Vetlicin, Yu0N „Zhuravlev, N„ M0Ilyin

and FoG. Kochevin

(53) 621.313.04 (088.8)

(56) USSR Author's Certificate No. 1152067, class „H 02 K 5/00, 1983.

(54) ELECTROSHPINDEL WITH MAGNETIC IODE - ROTOR WEIGHT

(57) The invention relates to the field of electrical engineering and may be

used in high-speed devices. The goal is to increase reliability and increase rotational speed. The electrical spindle includes a housing 1 with a stator 2 installed in whom, a shaft 11 with a rotor 12 mounted in active magnetic supports — axial and radial. At the shaft end, a recess is made, where a ferromagnetic cup 19 is installed, in the inner cavity of which an inductive displacement sensor 2I is placed. The sensor is shielded from the fields of the active axial magnetic support by the ferromagnetic cup and ferromagnetic insert 23 installed between it and the body 1 or

with e

(I

The invention relates to electrical engineering and can be used in high-speed grinding, milling, and so on. spindle x, turbo expander, inertial energy storage, and other devices that use magnetic rotor suspension.

The purpose of the invention is to increase the reliability of the electrical spindle and increase the speed of rotation of

The drawing shows the proposed electropindello

The electric spindle includes a housing 1, a stator packet of an electric motor 2, radial active magnetic bearings 3 (AMO), 4 position radial sensors pressed into the housings and separated by electromagnetic screens 5, ring electromagnets b,% axial

AMOs fixed in housing 1 and centered relative to each other by a stationary ring 8 emergency supports 9 installed in the cover 10 and on the inner surface of electromagnet 6, shaft i1 with pressed-in rotary engine 12, radial AMO 13, position sensors 14 separated by non-magnetic bushings. 5 and a disk 16 axial AMO, an electronic control unit for electromagnets, a power supply unit 18. From the non-working shaft end, a ferromagnetic glass 19 with a cylindrical washer 20 is pressed into the axial cylindrical recess, opposite to which the axial displacement sensor 21 is located, fixed in the body of the electromagnet 7 by means of a sleeve 22, an insert 23 and a ring 24

3

The magnets 6, 7 of the axial AMO are designed so that the values of the induction field in the working gap under the outer and inner poles are equal, which ensures the maximum bearing capacity of the bearing. The shaft I1 is made of a non-magnetic material, which reduces the heat loss of the electrospins at high speeds of rotation.

The device works as follows.

When the power supply unit 18 and the electronic control unit 17 are successively connected to the network, the shaft with the packages of the rotors 11 is weighed in a magnetic field at some distance relative to the fixed parts of the device and stabilizes: in the radial direction using magnetic forces of the power electromagnets 3, according to the information sensed by the sensors 4, and in the axial direction by the forces of ring electromagnets 6 and 7, controlled by the information sensed by the inductive sensor 21 axial displacements, which are reliably magnetically shielded with a ferromagnetic cup 19 and a ferromagnetic insert 23 from the scattered flux of power electromagnetically inductive sensors, operate on an alternating high-frequency current, their signals in the control unit 17 are converted to a constant voltage,

Q 5

0

are corrected by integrating differentiating links, amplified and fed to power electromagnets

After turning on the power supply of the electric drive, the rotor grows and can accelerate to the first angular critical (bending) rotational speed.

Claims (1)

Invention Formula Electro spindle with magnetic suspension of the rotor, comprising a housing, a stator, a shaft, a rotor, two radial electromagnetic and one axial support, including two coaxial ring electromagnets fixed in the housing and a disk mounted on the shaft and located between the ring electromagnets, an inductive axial displacement sensor mounted on body from the non-working end of the shaft, which is characterized by the fact that, in order to increase reliability and increase the rotational speed, it is equipped with a ferromagnetic disk and a glass axial cylindrical for deeper, performed on non-working end of the shaft, wherein the inductive sensor is disposed in the interior of glass and fixed to the disc loaded between them korpusomo in a n s h} n 1