SU943993A1 - High-speed electric machine rotor - Google Patents

Description

(5) ROTOR OF HIGH-SPEED ELECTRIC MACHINE

one

The invention relates to high-speed electric machines with a relatively large non-magnetic gap, such as synchronous and permanent magnet valve machines on the rotor, and can be used in pipe compressor drives, light beam scanners and other high-speed drives., 0

A rotor is known which contains an icductor in the form of a permanent magnet mounted on a shaft D1.

The disadvantage of this design lies in the relatively low 5 peripheral speed.

Also known high-rotor rotor. a growing electric machine, comprising a shaft, a smooth barrel attached thereto, including an active part of the machine, such as a permanent magnet inductor, and a thin-walled dielectric cylinder located concentrically to the rotor barrel and associated

mechanically with the shaft by means of at least one bearing assembly. The presence of a dielectric cylinder rotating with a rotational speed equal to about half the rotational frequency of the active part makes it possible to significantly reduce aerodynamic losses due to the rotation of the rotor C2.

A disadvantage of the known construction is a relatively large non-magnetic gap, due to the presence of a significant gap between the active part and the dielectric cylinder, as well as the relatively large thickness of the dielectric cylinder. In addition, low impact strength is inherent in this rotor due to the presence of a dielectric cylinder located with a gap when the rotor is stationary.

Claims (2)

The purpose of the invention is to increase the power density by reducing the non-magnetic gap and increasing the impact strength. PoTdpa. 3 The goal is to achieve that an anti-adhesive layer is applied to the rotor barrel with respect to the material of the dielectric cylinder, the dielectric cylinder is installed on the specified layer, and the dielectric cylinder is made of a material with a modulus of elasticity less than the elastic modulus of the material of the barrel and rotor. The drawing shows schematically the proposed rotor. The rotor contains a shaft 1 with a smooth barrel 2, concentric of which is a dielectric cylinder 3 connected to the shaft 1 by means of bearings k and shields 5. The dielectric cylinder 3 is made of composite material by winding a yarn or tape impregnated with a binder. To reduce the air gap between the dielectric cylinder 3 and the smooth barrel 2 and to reduce the thickness of the cylinder 3, it is carried out directly on the smooth barrel 2, on which i is pre-coated with adhesive layer 6 against adhesive material. The presence of anti-adhesive layer eliminates pasting bonding material of the dielectric cylinder during its polymerization with the rotor barrel. For the manufacture of a dielectric cylinder, glass fiber, glass tape or fiberglass with a tensile modulus of elasticity lying in the range of 2000-3000 kgf / mm of the Cavity 7 when winding the cylinder 3 is filled with disks (not shown) with a diameter equal to the diameter of the barrel 2 rotor, which after polymerization, the binder is removed from cylinder 3. The panels 5 are glued to the cylinder 3 with epoxy resin or glue. By performing the dielectric cylinder 3 directly on the barrel 2 of the rotor, the gap between them is reduced to a minimum. In the idle state, this value is close to zero, and the gap appears only when the rotor rotates. The thickness of the dielectric cylinder is also reduced, and its production is substantially simplified. When the rotor rotates in its elements — a smooth barrel 2 and a dielectric cylinder 3, tensile stresses arise that lead to an increase in their diameters. Velkchine 3 increments of diameter are directly proportional to the density of the material and inversely proportional to the value of its elastic modulus. The density of the material of the dielectric cylinder is approximately 2 g / cm, i.e. about 4 times lower than the density of the rotor barrel made of steel and magnet, and the elastic modulus (2000-3000 kgf / mm; about 10-7 times lower than the elastic modulus of the material of the rotor barrel. Thus, the increment of the diameter of the dielectric cylinder is 2.5 - 1.7 times the increment of the diameter of the rotor barrel in case the rotor barrel is a cylinder in which there are no prior protective stresses. However, the elements of the rotor barrel are in a prestressed state (with tension on each other). thanks h The magnitude of the increment of the diameter of the rotor barrel decreases when rotated. Taking into account the preload of the rotor barrel, the increment of the diameter of the dielectric cylinder is 3 times greater than the increment of the diameter of the rotor barrel. The cylinder is approximately equal to two, the size of the increment of the diameter of the cylinder in the working (during the rotation of the rotor) state B is 1.52 times larger than that of the rotor barrel. Due to the difference in the increments of the diameters of the cylinder and barrel, there is an air gap between them, which ensures the difference in the speeds of rotation of the cylinder and the barrel of the rotor. The difference in increments of the diameters of the barrel and the cylinder must be such as to compensate for the eccentricity of the barrel of the rotor and the cylinder caused by errors in the manufacture of the barrel and the presence of a radial clearance in the bearings 4. Since the manufacturing accuracy of rotors of high-speed machines is very high and the accuracy of the bearings used in them is high, the eccentricity value is no more than 10-15 of the difference value in the increment of the diameters of the cylinder and the rotor barrel at the circumferential speeds of the rotor above 100 m / s. The application of the invention allows to reduce the magnitude of the non-magnetic gap, which helps to reduce the resistance of the magnetic circuit, to increase the impact strength of the rotor due to the fit of the cylinder to the barrel in an inoperative state, which reduces the possibility of damage to the cylinder when assembling the machine, and simplify the manufacture of a dielectric cylinder. An invention of a rotor of a high-speed electric machine, comprising a shaft, a smooth barrel fixed to it, including an active part, for example a permanent magnet inductor, and a thin-walled dielectric cylinder located concentrically to the rotor barrel — and mechanically connected to 36, at least one bearing assembly, characterized in that, in order to increase the specific power and impact strength, a layer is applied to the rotor barrel, a layer in its dielectric cylinder, The electric cylinder is installed on the specified layer, and the dielectric cylinder is made of a material with an elastic modulus smaller than the modulus of elasticity of the material of the rotor barrel. Sources of information taken into account in the examination 1. UK Patent V. 985210, cl. H 2 A, 1965. 2. USSR author's certificate number 773779, cl. H 02 K 1/22, 1979. V g} / / 7