High-performance rotation motor with high starting torque and low starting current

Abstract

The invention discloses a high-performance rotation motor with high starting torque and low starting current. A rotor bar of the motor is formed by compounding two materials with different resistivity, the resistivity of a material close to the outer edge part of a rotor is high, the resistivity of a material close to the bottom of a slot of the rotor is low, and the two materials form a whole through a metallurgical structure. During starting of the motor, most of current of the rotor flows through from the high-resistivity material close to the outer edge of the rotor due to a skin effect, and the resistance is increased, so that the current is reduced, the starting torque is increased, and high starting torque and low starting current are realized; with increase of the rotating speed of the motor, the skin effect fades away, and the current is allocated to flow through each layer of materials of a rotor winding according to resistance; the resistivity of the material close to the bottom of the slot of the rotor is low, the area is large, and most of current flows through from the material of the part, so that the mechanical characteristic of the motor is close to that of an ordinary super-effective motor, the extra hard mechanical characteristic is realized, and the motor driving efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of three-phase asynchronous motors, in particular to a high-performance three-phase asynchronous motor with high starting torque and low starting current. Background technique [0002] Asynchronous motors are the most widely used power equipment in various production fields of the national economy. For different production machinery, there are different requirements for the mechanical properties of the motor. For the drive of large inertia loads, the motor must have a large starting torque. The traditional torque Although the starting torque of the motor is large, its mechanical characteristics are very soft, and the torque is very small when running at high speed, which is not conducive to improving the efficiency of the working machine. Using an ordinary motor to drive a large inertia mechanical load not only has a small starting torque, but also the starting current is the rated operating current 6 to 8 times that ...

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Problems solved by technology

[0002] Asynchronous motors are the most widely used power equipment in various production fields of the national economy. For different production machinery, there are different requirements for the mechanical properties of the motor. For the drive of large inertia loads, the motor must have a large starting torque. The traditional torque Although the starting torque of the motor is large, its mechanical characteristics are very soft, and the torque is very small when running at high speed, which is not conducive to improving the efficiency of the working machine. Using an ordinary motor to drive a large inertia mechanical load not only has a small starting torque, but also the starting current is the rated operating current 6 to 8 times that of the slewing mechanism of the tower crane, the required driving torque is related to the weather. For the windy weather, the driving motor torque is often small and the starting time is long, causing the motor to work for a long time in a high current state. If it is too long, the temperature rise of the motor winding will increase sharply, and the motor will be burned, which will seriously affect the normal production. Therefore, for the large inertia load drive, it is necessary to have a high-performance motor with large starting torque and small starting current to ensure high starting ability and High running performance, at the same time, it can ensure that the motor will not be burned even if the stall time is too long under the condition of excessive wind resistance

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