CN201956853U - Copper aluminum rotor for ACC - Google Patents

Abstract

A copper aluminum rotor for an ACC (Air Condition Compressor) comprises a rotor iron core formed by riveting an electromagnetic steel plate punching, a cast aluminum end ring, and an aluminum post for connecting with a counter balance, wherein a shaft hole for assembling a crankshaft of the ACC is formed in the middle of the rotor iron core; rotor slots are uniformly and radially distributed on the circumference of the rotor iron core; cast aluminum guide strips same with the rotor slots in shape are mounted in the part of rotor slots; copper guide strips are mounted in the rest of the rotor slots; and the copper guide strips and the cast aluminum guide strips are uniformly distributed in the rotor slots on the circumference of the rotor iron core at intervals. The cast aluminum rotor for the ACC provided by the utility model has the benefits that aluminum guide strips with low electric conductivity are replaced by the copper guide strips with high electric conductivity, the loss of a rotor winding is reduced, and the efficiency and the rotation speed of a squirrel-cage induction machine are improved. In addition, the copper guide strips and the rotor slots are in clearance fit to increase the resistance between the copper guide strips and the rotor iron core, so that the rotor loss caused by transverse current is reduced, the motor efficiency is further improved, and the cast aluminum rotor for the ACC can be produced via the present cast aluminum equipment when a little modification is made on the present production process.

Description

A copper-aluminum rotor used in an air-conditioning compressor

technical field

The utility model belongs to the technical field of compressors, in particular to a squirrel-cage cast aluminum rotor of an air-conditioning compressor.

Background technique

Squirrel-cage induction motors are widely used in air-conditioning compressors because of their simple manufacturing process, low cost, and high reliability. When developing high-efficiency air-conditioning compressor motors, methods such as increasing the core length, reducing the magnetic density, increasing the slot fullness rate, and reducing the stator winding resistance are usually adopted. Its disadvantage is that the length of the motor core increases, which leads to the increase of the length of the aluminum bar of the squirrel-cage rotor, thereby increasing the proportion of the rotor winding loss to the total loss of the motor.

Contents of the invention

The purpose of this utility model is to propose a copper-aluminum rotor for air-conditioning compressors. The copper guide bars with the same slot shape as the rotor are inserted into part of the rotor slots, and the remaining rotor guide bars and rotor end rings are made of cast aluminum.

The technical scheme of the utility model is: a copper-aluminum rotor for an air-conditioning compressor, including a rotor core formed by punching and riveting electromagnetic steel plates, a cast aluminum end ring and an aluminum column for connecting the balance weight. The shaft hole assembled with the crankshaft of the air-conditioning compressor has rotor grooves evenly distributed on the radially outer circumference, and a part of the rotor grooves is equipped with cast aluminum guide bars of the same shape as the rotor grooves. It is characterized in that the rest of the rotor grooves are equipped with copper The guide bars, the copper guide bars and the cast aluminum guide bars are evenly distributed in the rotor slots on the circumference of the rotor core at intervals.

A copper-aluminum rotor for an air-conditioning compressor according to the utility model is characterized in that the copper guide bars that are evenly distributed in the rotor slots on the circumference of the rotor core are separated from each other by copper guide bars cast aluminum guide bars, and the distance between them is one copper guide bar. The bars are adjacent to one cast aluminum bar, or one copper bar is adjacent to two cast aluminum bars, or two copper bars are adjacent to one cast aluminum bar.

A copper-aluminum rotor for an air-conditioning compressor according to the utility model is characterized in that the two ends of the copper guide bar protrude from the two ends of the rotor core, and the parts protruding from the two ends of the rotor core are T-shaped or reverse L-shaped, and the extension Outlets are housed in cast aluminum end rings.

A copper-aluminum rotor for an air-conditioning compressor according to the utility model is characterized in that the copper bar and the rotor groove are fitted with a gap, and the gap is between 0.05 mm and 0.1 mm.

The beneficial effect of the utility model is that the copper guide bar with high conductivity is used to replace part of the aluminum guide bar with low conductivity, which reduces the winding loss of the squirrel-cage rotor and improves the efficiency and speed of the motor. Due to the small gap between the copper guide bar and the rotor slot, the loss caused by the transverse current of the rotor is reduced, the efficiency of the motor is further improved, and there are few changes to the production process, and the existing aluminum casting equipment can be used for production.

Description of drawings

The utility model has 2 accompanying drawings, wherein

Fig. 1 is the copper-aluminum rotor schematic diagram of the present utility model;

Fig. 2 is a schematic radial cross-sectional view of the rotor in Fig. 1 .

In the picture: 1 cast aluminum end ring, 2 copper guide bar, 3 rotor core, 4 aluminum column, 5 cast aluminum guide bar, 6 shaft hole

Detailed ways

Below in conjunction with the embodiment of accompanying drawing, the utility model is further described.

Example 1

The rotor core 3 is riveted by punching electromagnetic steel plates, with a shaft hole 6 punched in the middle for assembly with the crankshaft of the air conditioner compressor, and rotor slots punched on the radially outer side, the number of slots is an even number, and the copper guide with the same slot shape as the rotor The bars 2 are inserted into the rotor slots every other slot, and are evenly distributed on the rotor circumference, as shown in Figure 2. The rest of the rotor slots are cast aluminum guide bars 5, and the ends of the guide bars are connected to the end ring 1, and the end ring 1 is cast aluminum The end ring adopts a casting method to cover the end of the guide bar in the end ring. When the end ring 1 and the aluminum guide bar 5 are cast, the aluminum column 4 for connecting the balance weight is cast at the same time. Both ends of the copper guide bar 2 inserted into the rotor slot protrude from the rotor core 3, and the protruding part is T-shaped. When casting the end ring 1, the copper guide bar can be better connected with the end ring 1, reducing the risk of damage caused by copper and aluminum. Poor connection caused by gaps due to differences in thermal expansion coefficients.

Example 2

The rotor core 3 is riveted by electromagnetic steel sheet punching, with a shaft hole 6 punched in the middle for assembly with the crankshaft of the air conditioner compressor, and rotor slots punched on the radially outer side. The number of slots is a multiple of 3, and one slot is inserted every second slot. Copper guide bars 2 with the same groove shape as the rotor, the copper guide bars are evenly distributed on the circumference of the rotor, and the remaining rotor slots are cast aluminum guide bars 5 . Other parts of the rotor are the same as in Embodiment 1.

Example 3

The rotor core 3 is riveted by punching electromagnetic steel plates, with a shaft hole 6 punched in the middle for assembly with the crankshaft of the air conditioner compressor, and rotor slots punched on the radially outer side, the number of slots is a multiple of 3, and every other slot Two adjacent slots are inserted with two copper guide bars 2 of the same groove shape as the rotor, the copper guide bars are evenly distributed on the circumference of the rotor, and the remaining rotor slots are cast aluminum guide bars 5 . Other parts of the rotor are the same as in Embodiment 1.

Claims (4)

1. A copper-aluminum rotor for an air-conditioning compressor, comprising a rotor iron core (3), a cast aluminum end ring (1) and an aluminum post (4) used to connect a balance weight, and a rotor iron core ( 3) There is a shaft hole (6) in the middle for assembling with the crankshaft of the air-conditioning compressor, and rotor slots are evenly distributed on the radially outer circumference, and guide bars are installed in the rotor slots, which are characterized in that the guide bars are installed in the rotor slots, A part of the rotor slot is equipped with cast aluminum guide bars of the same shape as the rotor slot, and the rest of the rotor slot is equipped with copper guide bars (2). The copper guide bars (2) and the cast aluminum guide bars (5) are evenly distributed on the In the rotor slots on the circumference of the rotor core. 2. A copper-aluminum rotor for an air-conditioning compressor according to claim 1, characterized in that the copper guide bars (2) cast aluminum guide bars that are evenly distributed in the rotor slots on the circumference of the rotor core are separated from each other. (5), the interval is that a copper guide bar (2) is adjacent to a cast aluminum guide bar (5), or a copper guide bar (2) is adjacent to two cast aluminum guide bars (5), or two The copper guide bar (2) is adjacent to a cast aluminum guide bar (5). 3. The copper-aluminum rotor for an air-conditioning compressor according to claim 2, characterized in that the two ends of the copper guide bar (2) protrude from both ends of the rotor core (3), and the rotor core (3) The parts at both ends are T-shaped or reversed-L-shaped, and the protruding part is covered in the cast aluminum end ring (1). 4. The copper-aluminum rotor for an air-conditioning compressor according to claim 3, characterized in that the copper guide bar (2) and the rotor groove are fitted with a gap, and the gap is between 0.05mm-0.10mm between. the

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