Classification Characteristics Of Solar Water Pumps

AC asynchronous motor driven water pump
In photovoltaic water pump systems with larger power (for example, when the power is greater than 10KW or more), there are still many three-phase AC asynchronous motors used as drive motors. Among them, asynchronous motors usually use wet sheath windings. Due to the structure with low slot full rate Characteristics: Its efficiency is usually much lower than that of DC permanent magnet brushless motors of the same power, but its structure is relatively simple and its cost is relatively low. Oil-immersed motors are not suitable for use in water supply systems that also provide drinking water for humans and animals, so there is still a certain demand . The core of its drive control is a dedicated frequency conversion and control integrated power supply, which essentially integrates frequency conversion technology, photovoltaic array maximum power point tracking technology and several necessary operation protection measures into the same controller, and the central controller completes the photovoltaic All the control functions required in the water pump system. The advantages of this are good system stability, compact structure, motor voltage levels can be freely optimized and selected according to the array configuration, low manufacturing cost, and at the same time, full consideration can be given to the fact that the photovoltaic water pump will be unmanned for long periods of time outdoors. On-duty, fully automatic operation and other characteristics, special considerations are given in aspects such as heat dissipation, dust protection, lightning protection and various special protection measures (such as dry protection). Compared with the "patchwork" structure, it is much more economical and reliability.
DC permanent magnet brushless motor driven water pump
DC motors have been widely used in motion control systems due to their good mechanical properties, wide speed range, large starting torque, high operating efficiency, and simple control. However, their brushes and phase commutators also bring reliability Weaknesses such as low performance and the need for constant maintenance. In the past 20 years, with the rapid development of high-power switching devices, analog and digital integrated circuits, computer technology, and high-performance magnetic materials, brushless DC motors that use the electronic commutation principle have also developed correspondingly rapidly. It has rapidly expanded from its initial application in aerospace and military facilities to industrial and civil fields, and its use has become increasingly widespread. Low-power brushless DC motors have been widely used in computer peripherals, office automation, and audio and video equipment. In some In electric transmission systems, its applications are becoming more and more widespread.
Over the past few years, brushless DC motors have begun to be used as drive motors in photovoltaic water pump systems. This is because this type of motor has high efficiency that is difficult to achieve with ordinary AC motors. It is expected to significantly reduce the relatively expensive solar energy consumption. The battery consumption is significantly economical. However, since photovoltaic water pumps usually require the motor to operate submerged in water, the research work in this article not only needs to solve the operation and driving technology of conventional brushless DC motors, but also requires the motor to adapt to the requirements of submersible, which means that the reliable insulation of the windings must be solved at the same time. question. It is certainly an idea to find ways to solve the sealing problem of submersible motors from the perspective of mechanical seals, but it is difficult to overcome the problems of complex structure and corresponding large mechanical losses.