Centrifugal pump of asynchronous-starting permanent-magnet-synchronous motor

Abstract

The invention especially relates to a centrifugal pump of an asynchronous-starting permanent-magnet-synchronous motor. The centrifugal pump comprises a pump body and a motor. A rotor iron core of a motor rotor is formed by axial superposition of a plurality of circular silicon steel sheet rotation shafts; a plurality of conducting bar windings are inserted at the periphery of the rotator iron core uniformly and a circular mouse cage structure is formed by encircling of all conducting bar windings. Besides, a group or two groups of permanent magnets are arranged on the rotator iron core; one group or two groups of opposite magnetic poles, distributed symmetrically along the radial central lines of the permanent magnets, of the permanent magnets are formed at the radial cross section of the rotator iron core. Permanent magnets are arranged between the rotor mouse cage bars at intervals and, together with the permanent magnets arranged at the inner layer of the mouse cage structure, form first permanent magnets and second permanent magnets. According to the invention, compared with the high-efficiency YE3 product, the motor efficiency of the centrifugal pump is improved by 5 to 7%; and compared with the common Y2-series motor, the motor efficiency is improved by 10 to 15%. When the power grid voltage and load are changed, the lift and flow of the pump are kept to be unchanged. The innovative concept can be applied to all pumps without frequency converters; and thus high-efficiency and stable work can be realized.

Description

technical field [0001] The invention belongs to the technical field of water pumps, in particular to a centrifugal pump with an asynchronous start permanent magnet synchronous motor. Background technique [0002] Pump is one of the most commonly used equipment, and it is a major category of electricity consumption in the machinery industry. Most of the pumps used for industrial water supply are centrifugal pumps. There are single-stage or multi-stage horizontal centrifugal pumps, single-stage or multi-stage vertical pipeline pumps, booster pumps, and single-stage or multi-stage submersible centrifugal pumps. Agricultural water supply and drainage pumps are mainly centrifugal pumps, including single-stage horizontal centrifugal pumps and single-stage or multi-stage submersible pumps. [0003] Most of the water supply for urban buildings is supplied by multistage centrifugal pumps. The motors used are mostly single-phase or three-phase asynchronous motors. Due to the limita...

AI Technical Summary

Problems solved by technology

Due to the limitation of the structure principle, the efficiency of this kind of motor is low, and the technology is outdated and urgently needs to be corrected and improved.

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