CN2263412Y - Rotor suitable for self-starting permanent-magnet synchronous submersible electric machine with oil - Google Patents

Abstract

The utility model relates to a rotor suitable for a self-starting permanent magnet synchronous submersible motor. The silicon steel punching sheet in the rotor is circular, the inner hole is also circular, and several small circular holes are punched on the outermost circumference. Four arc-shaped holes of the same shape and size are punched out inside the small round hole, and they have the same center. The two arc-shaped holes in the upper semicircle are about 1 mm apart, and the two arc-shaped holes in the lower semicircle are also separated from each other. About 1 mm, the magnetic steel made of neodymium-iron-stilbium rare earth permanent magnet material is respectively packed into four arc-shaped holes of the upper semicircle and the lower semicircle, and the utility model is installed in the existing submersible motor stator, which can The efficiency and power factor are greatly improved.

Description

Rotor for self-starting permanent magnet synchronous submersible motors

The utility model relates to a rotor suitable for a self-starting permanent magnet synchronous submersible motor.

Nowadays, the submersible motors produced and used at home and abroad are all asynchronous motors. Its rotor structure is a squirrel-cage structure, which causes the efficiency and power factor of the motor to be low, and the speed is lower than the synchronous speed, and it decreases with the increase of the load. The pump efficiency is reduced, and the energy consumption of oil recovery is large.

The purpose of this utility model is to propose a rotor suitable for self-starting permanent magnet synchronous submersible motor, which can greatly improve the efficiency and power factor of the motor, and the speed will always maintain synchronous speed, improve pump efficiency, and reduce oil production energy consumption.

The purpose of this utility model is achieved in that, according to the synchronous motor principle, the synchronous motor is fixed, the rotor bilateral excitation system, suitably increasing the rotor side excitation just can improve the power factor of the motor. The utility model adopts NdFeB rare earth permanent magnet material in the rotor structure to excite the rotor, which saves complex structures such as the excitation winding and excitation power supply of the traditional synchronous motor, also saves the excitation power of the rotor, and improves the efficiency of the motor.

The principle and structure of the utility model are described in detail below in conjunction with the accompanying drawings: the rotor proposed by the utility model is formed by laminating several silicon steel punches, wherein the silicon steel punches have three forms, and the first silicon steel punches are circular, wherein The inner hole is also circular, and several small round holes are punched on the outermost circumference, which are used for installing guide bars. Four arc-shaped holes in the same shape and size are punched out inside the small round hole 3. They have In the same circle center, the two arc-shaped holes in the upper semicircle are about 1 mm apart. Similarly, the two arc-shaped holes in the lower semi-circle are also about 1 mm apart. These four arc-shaped holes are used for installing NdFeB rare earth magnets. For steel. The second form is based on the first silicon steel punching sheet, and two arc-shaped holes are punched on the AB axis of the motor quadrature axis. The shape and size are exactly the same and are symmetrical. The third form is in On the basis of the first silicon steel punching sheet, four rectangular holes are punched out in the center of the four teeth closest to the quadrature axis AB of the motor. In the utility model, hundreds of silicon steel punches are positioned with key grooves, and laminated to form a rotor core with an axial length of 30-40 cm. Then, the tile-shaped NdFeB rare earth magnets that have been pre-filled with magnets are pressed to a certain pole. It is embedded in four arc-shaped holes along the axis of the motor, and fixed with epoxy glue. Guide bars are installed in several small holes on the iron core, and the two ends are connected with the end rings and riveted to form a whole squirrel-cage winding. The final assembled rotor has two magnetic poles, N and S. The utility model is to put the whole rotor into the stator cavity, and the submersible motor is installed vertically and has a multi-stage structure. The thrust bearing at the top of the motor, the centering bearing between the multi-stages and other parts are finally assembled into a whole motor.

Putting the utility model into the stator of the existing self-starting permanent magnet synchronous submersible motor has the following advantages:

① High power index (efficiency and power factor), energy saving.

②The speed always maintains the synchronous speed, and the pump efficiency is high.

③The motor can start automatically without any auxiliary equipment.

④Under the same power condition, the motor is smaller than the asynchronous motor, saving effective materials.

The advantages of the self-starting permanent magnet synchronous submersible motor equipped with the utility model over the existing asynchronous motor are as follows: The utility model Existing asynchronous motor Rated power (single cell) KW 15 12 Rated speed r/m 3000 2850 Frequency Hz 50 50 efficiency% 88 82 power factor 0.92 0.81

Fig. 1 is the structural diagram of the first silicon steel punching sheet in the utility model.

Fig. 2 is the structural diagram of the second silicon steel punching sheet in the utility model.

Fig. 3 is the structural diagram of the third silicon steel punching sheet in the utility model.

Example:

Laminate 700 pieces of silicon steel punches together, embed the pre-filled NdFeB rare earth magnets in four arc-shaped holes, and fix them firmly with epoxy glue. The self-starting permanent magnet synchronous submersible motor made by adopting the silicon steel punching sheet described in the utility model has a rated power (single section) of 15kw, a rated power of 3000r/m, an efficiency of 88%, and a power factor of 0.92.

Claims (3)

1. A rotor suitable for self-starting permanent magnet synchronous submersible motors, characterized in that: the silicon steel punch [1] in the rotor is circular, the inner hole is also circular, and there are several punches on the outermost circumference Small round hole [3], four arc-shaped holes [2] with the same shape and size are punched out inside the small round hole [3], they have the same center of circle, and the two arc-shaped holes of the upper semicircle are 1 apart About millimeter, the two arc-shaped holes of lower semicircle are also about 1 millimeter apart, and the magnetic steel made of NdFeB rare earth permanent magnet material is packed into four arc-shaped holes of upper semicircle and lower semicircle respectively. 2. The rotor according to claim 1, characterized in that two circular arc-shaped holes with the same shape and size and symmetry are punched out on the silicon steel punching sheet [1] in the rotor on the axis AB of the motor axis. 3. The rotor according to claim 1, characterized in that four small rectangular holes are punched out in the center of the four teeth close to the quadrature axis AB of the motor on the silicon steel sheet [1] in the rotor.

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