RU2004047C1 - Rotor pole of sync explicit pole machine - Google Patents

Abstract

Usage: electrical engineering. SUMMARY OF THE INVENTION: The core of the pole has the shape of a truncated tetrahedral pyramid, the base of which is at the top (from the shaft) and the side faces form at the apex an angle, two end faces. The field winding is mounted on the pole core without a gap between the side faces and the end faces, and are fixed with wedges that form an angle normal to the axis of rotation. In the end parts, the coil has through ventilation ducts of 6.15 mm wide. The walls and the axis of the ventilation duct form an angle E (20 °) with a normal to the axis of rotation. 2 ill. .

Description

The invention relates to electrical engineering, in particular to rotors of synchronous extra-pole electric machines, with a speed of 500 rpm.

Known are the rotor pole designs of an out-of-pole synchronous electric machine comprising a ferromagnetic pole core with parallel walls (solid or lined) with a pole shoe and a damper winding and an excitation winding.

A significant drawback of these versions of the rotor pole is that between the parallel walls of the pole in the form of a parallelepiped and the field coil of the pole there are air gaps between the inner surface of the field coil and the side surface of the metal of the pole core. Air gaps impair heat transfer from the field winding to the core metal, which causes the field winding to overheat, increase its resistance, increase losses and degrade performance.

A known construction of the rotor pole of a synchronous out-of-pole electric machine, in which the upper and lower turns and terminals of each coil of the field winding are thermally reactive insulated, is provided along the entire perimeter of section 1.

This design is close to the claimed one, but also in it, although the heat transfer from the excitation coil to the pole shoes and the rotor skeleton in the upper and lower parts is increased, between the inner surface of the excitation coil and the side walls of the pole core, in the form of a rectangular parallelepiped, there are also air gaps, which impairs thermal conductivity and heat transfer from the inner surface of the field coil to the pole core metal, which leads to overheating, increase the field coil resistance, eniyu loss and deterioration in the performance characteristics of the machine.

The rotor pole of a four-pole non-pole electric machine 2 is known, when the pole core has the shape of a truncated tetrahedral pyramid, the base of which is at the top and two side faces form an angle of 90 °. However, in this design the overhang of the frontal parts is increased, which increases the consumption of winding copper and eliminates the thermal conductivity from the frontal parts to the metal of the pole.

The aim of the invention is to reduce the overheating of the field winding,

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reducing losses, improving the operational characteristics and reliability of the rotor of a synchronous out-of-pole machine, and therefore of the entire electric machine.

The goal is achieved in that the pole core has the shape of a truncated tetrahedral pyramid, the base of which is at the top and two side faces form an angle 2 a 0 at the apex, two end faces a 0, and the field winding is mounted on the pole core without a gap between the side faces and along end faces are fixed with wedges that form an angle fi with a normal to the axis of rotation. The field winding has a thermosetting-insulated structure that has radial ventilation ducts of width a at the ends, the axes of which form an angle / 3 with the normal to the axis of rotation.

In FIG. 1 shows a cross section of a pole; in FIG. 2 is a longitudinal section of its end portion.

In FIG. 1 and 2 show the core of pole 1, on which, using wedges 2, a winding 3 is insulated on the pole of the pole without a gap on the lateral parts. The angle of inclination of the pole a lies within 0 and 20 °. The optimal value of the angle a lies in the range 3 ... 70. The drive coil 3 is secured to the pole core at the end parts by means of wedges 2 which are fixed in the lower part. Due to the angle of the pole and coil, and the coil cannot move to the pole shoe due to the angle of the core of the pole and coil, the coil cannot move to the shaft due to the angle of the wedges and coil (0/20 °). The optimal value of the angle / 3 lies within 3 .... 7 °. In this case, the axial components of the gas velocity are 5 .... 12%. In the end parts, the coil has through ventilation ducts in the radial direction of width a (.., 15 mm). The walls and the axis of the ventilation channel form an angle / with the normal to the axis of rotation. The winding 3 is supported on the pole shoe through the gasket 4. Using the short-circuit ring 5, the rods of the damper winding 6 form a short-circuit winding.

The proposed design of the rotor pole of the synchronous out-of-pole electric machine allows to reduce the heating of the field winding due to better heat transfer from the inner side surface of the field coil to the metal of the pole, the gap between the field coil and the metal of the pole along the side parts is minimized (without air gap), which reduces thermal resistance. When the rotor rotates in the end parts of the field winding through the channels, there is an intensive movement of gas cooling masses, which increase the heat transfer from the heated conductors of the coil, which significantly reduces the temperature of the winding, and this reduces the resistance of the winding, power loss in the winding, increases the efficiency, improves operational characteristics and reliability of a synchronous out-of-pole electric machine. The case insulation of the field coil is selected depending on the rated field voltage, taking into account possible overvoltages in the windings.

An experimental model of a 4SDM 215-26-24 synchronous electric mill with a power of 630 kW was manufactured

voltage of 6,000 V with the proposed design of the rotor poles. As a result of the tests, the following results were obtained: losses in the field winding on

3.1 kW; Motor efficiency increased by 0.46% and reached 94.93%; the temperature of the field winding exceeded 53 ° C; stator windings 64 ° C according to the class of insulation of the stator and rotor, the torque characteristics comply with the requirements of TU 16.

The proposed design of the poles of the rotor of a synchronous out-of-pole electric machine increases manufacturability

the manufacture of the inductor as a whole significantly affects the performance.

(56) 1. USSR Copyright Certificate No. 780100. cl. H 02 KZ / 18, 1978.

2. German patent No. 630697, cl. 21 d 49.1936.

Claims (1)

The claims POLE OF THE ROTOR OF THE SYNCHRONOUS COLORFUL MACHINE, containing the core of the pole having the shape of a truncated tetrahedral pyramid, the lateral faces of which form an angle 2a 0 at the apex, an excitation winding, a pole shoe with a damper winding, characterized in that, in order to improve operational characteristics and reduce overheating , the rotor is equipped with wedges for mounting the coil on the core along its end faces, the coil is made of monolithic thermosetting insulation with radial ventilation channels in it, while the coil is mounted on the core without a gap between its two side faces, and the angle of inclination of the wedges and the angle of inclination of the ventilation ducts form an angle of / 3 (0 p 20) with a normal to the axis of rotation.  6 cfrwi.i FIG. 2