SU1543497A1 - Rotor of synchronous electric machine with non-salient poles - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to improve cooling. In the slots of the rotor core 1, an excitation winding 2 is laid. In its middle part there are inclined channels 3 for the cooling gas. At the end sections of the core, podpazovye channels 4 are made, communicating with channels 5. Inclined channels 6 in the end zones of the slot winding are connected with longitudinal channels 7 of the frontal parts. Due to the fact that the slot part of the rotor is divided into seven cooled zones and the wedges of I, III, V and VII zones have only inlets oriented against the direction of rotation of the rotor, the wedges of the IV zone have only inlets directed along the rotation of the rotor, and the wedges II and The 6 zones have no holes, the achievement of the goal is achieved. 5 il.

Description

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The invention relates to electrical engineering and can be used in the rotors of synchronous non-pole electric machines, mainly in the rotors of turbogenerators with air deposition.

The aim of the invention is to improve cooling.

FIG. 1 schematically shows a rotor of a synchronous non-pole-pole electric machine, longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 1 $ FIG. 1 is a section bb of FIG. 1 $ FIG. 5 a section of YYY in FIG. one.

In the slots of the core of the rotor 1 on the winding 2 excitation. In the middle part of the winding there are inclined channels 3 for the cooling gas, which are connected in pairs at the bottom of the groove. In the sections of the rotor core adjacent to the ends, sub-gap channels are made. Channels 5, communicating with sub-alarms, are a series of two inclined channels interconnected axially. The inclined channels 6 in the end zones of the grooved part of the note are connected with the longitudinal channels 7 of the frontal parts. The direction of movement of the cooling air in the winding channels is indicated by arrows.

The groove part of the rotor is divided into seven cooled zones (I-VII), approximately equal in length.

The wedges of zones I, III, V and VII have outlet openings oriented against the direction of rotation of the rotor, without protruding visors. The wedge of the IV zone has only entrance holes oriented in the direction of rotation of the rotor, with protruding peaks. The wedge II and VI zones do not have air holes.

The rotor operates as follows.

Through the intakes of zone IV, the cooling air from the air gap flows as the rotor rotates into the winding channels 3 and is thrown back into the zones III and V. From the sub-space, the cooling air passes into the longitudinal channels 7 of the winding frontal parts and is ejected into the air gap through the inclined channels 6 in zones I and VII. In parallel with the frontal parts of the air enters the podpazovye channels, passes into the channel

5 and is thrown into the horizon in zones III and V.

air for

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five

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The proposed air-cooled turbogenerator rotor has high operational reliability due to improved cooling of the frontal parts and more uniform temperature distribution along the winding length and due to reduction of mechanical losses in the gap. The cooling scheme of the rotor winding allows to increase the air flow through the winding and uniformly distribute air into the groove and frontal winding parts, as well as due to the presence of rotor sections free from intakes and deflectors, to reduce mechanical losses, which can give the greatest effect in low power turbogenerators when using air as a cooling agent. The proposed rotor can also be used in the case when the cooling medium is any other gas.

Claims (1)

Invention Formula A rotor of a synchronous non-pole electric machine, comprising a core with grooves, a coil winding with direct gas cooling placed in the grooves, having inclined oppositely directed channels on the sides of the coils in the groove part, longitudinal channels in the frontal parts of the coils, communicating with inclined channels of the slot part, and groove wedges holding the winding, having through holes for gas inlet and outlet connected to inclined channels, the holes for the gas stroke in the wedge is equipped with visors-inlets, characterized in that, in order to improve cooling, in the zones adjacent to the end parts of the core there are sub-channel channels connected to the cavity under the winding frontal parts, and combined channels made in the form of communicating with sub-grooves of the inclined sections on the sides of the coils and the longitudinal sections connected thereto, communicating with the inclined channels of the slot portion. Aa 6-5 one Phie2 PhieZ gd PhieA