Ac asynchronous motor drives the water pump

High power (for example, when the power is greater than 10KW or greater) photovoltaic pump system, the drive motor is still no shortage of three-phase AC asynchronous motors, which asynchronous motors usually use wet jacket winding, due to the structural characteristics of low slot filling rate, its efficiency is usually much lower than the same power DC permanent magnet brushless motor, but its structure is relatively simple, relatively low cost, oil The immersion motor is not suitable for use in water supply systems that provide drinking water for humans and animals at the same time, so there is a certain demand. The core of its drive control is a dedicated frequency conversion and control integrated power supply, in essence, the frequency conversion technology and photovoltaic array maximum power point tracking technology and a number of necessary operation protection measures set in the same controller, by the central controller to complete all the control functions required in the photovoltaic pump system, the advantages of this is good system stability, compact structure, motor voltage level can be According to the array configuration, the manufacturing cost is low, and the photovoltaic pump can fully take into account the characteristics of long time unattended, fully automatic operation, in the heat dissipation, dust, lightning protection and various special protection measures (such as dry protection) are given special consideration, compared with the "patchwork" structure has much higher economy and reliability.