Constant-pressure non-negative pressure water supplying unit adopting permanent magnet synchronous motors

Abstract

The invention provides a constant-pressure non-negative pressure water supplying unit adopting permanent magnet synchronous motors. The constant-pressure non-negative pressure water supplying unit adopting the permanent magnet synchronous motors, provided by the invention, has the beneficial effects that the permanent magnet synchronous motors are adopted; when only one pump motor exists or two pump motors exist, variable frequency drivers are adopted to match with variable frequency driving permanent magnet synchronous motors; when two or more pump motors exist, a pump of one variable frequency driving permanent magnet synchronous motor is adopted as a main pump, several other motors which are used as auxiliary pumps adopt asynchronous starting permanent magnet synchronous motors, and a power-frequency power supply is directly used for supplying power, so that the trouble that common permanent magnet synchronous motors need mated variable frequency drivers is omitted, the cost is reduced, and the efficiency is increased; according to the scheme, the application problem of the permanent magnet synchronous motors on configuration of constant-pressure non-negative pressure multi-pump water supplying devices is solved, asynchronous motors in the constant-pressure non-negative pressure water supplying unit can be comprehensively replaced with the permanent magnet synchronous motors, and the maximum energy saving effect of the constant-pressure non-negative pressure water supplying unit can be achieved.

Description

technical field [0001] The invention belongs to the technical field of water supply units, in particular to a permanent magnet synchronous motor constant pressure non-negative pressure water supply unit. Background technique [0002] With the continuous improvement of the living standards of urban and rural people, more and more high-rise buildings are built in cities and small towns, and the water supply equipment of buildings is also constantly updated. At present, most of the water supply in urban buildings use constant-pressure non-negative-pressure pump units to supply water, and use vector frequency converters to drive three-phase asynchronous motors. Through each set of pressure sensors, constant pressure control is performed on the water inlet and outlet pipelines to realize constant-pressure water supply automation for buildings. . Although the water supply efficiency of this type of unit is much higher than that of the previous single-pump unit, since the motor us...

AI Technical Summary

Problems solved by technology

Although the water supply efficiency of this type of unit is much higher than that of the previous single-pump unit, since the motor used is a three-phase asynchronous motor instead of a high-efficiency permanent magnet synchronous motor, there is still a large room for improvement in efficiency.

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