The newly bought fan in the workshop always burns the motor? The air conditioner in the office trips as soon as it is turned on? When many people choose induction motors, they either buy a large power to waste money, or the speed is wrong and the equipment stops working. In fact, if the motor is selected correctly, not only will the equipment last longer, but it can also save 30% of the electricity bill! Today, I will teach you how to make the induction motor and the equipment perfectly “matched”.
Why is your motor always “angry”?
Many factory owners have encountered such a problem: the motor bought according to the equipment manual will heat up seriously after a short time, or even burn out directly. The reason behind this is often that the real “strength” requirement of the equipment is not understood. Just like using a small horse to pull a big cart, the motor will be overloaded for a long time, and its life will naturally be greatly reduced. The problem of speed mismatch is more hidden. For example, if the fan speed is too fast, it will not only make a lot of noise, but also accelerate the wear of the equipment; if the speed is too slow, the ventilation effect cannot be achieved. These problems are ultimately due to the fact that the selection is not based on the load characteristics – constant torque loads require stable force, square torque loads are sensitive to speed changes, and constant power loads must take into account power output at high and low speeds.
three steps to accurately select the motor
The first step is to find out the “appetite” of the equipment. When calculating power, first determine the load type: for constant torque equipment such as cranes, the basic power can be calculated by torque × speed ÷ 9550, and then 15% – 20% margin is reserved; for square torque equipment such as fans and water pumps, the power is proportional to the cube of the speed, and special attention should be paid to power changes when adjusting the speed.
The second step is to match the speed rhythm. Fixed speed equipment directly selects the motor with the corresponding pole pair number. The 4-pole motor (1500r/min) is suitable for most scenarios; equipment that requires speed regulation can be flexibly adjusted with a frequency converter and can also save electricity.
The third step is to check environmental adaptability. In workshops with high temperature and high dust, motors with protection levels above IP54 must be selected to avoid premature aging.
The hidden value of choosing the right motor A precisely matched induction motor can make the equipment run more stably and significantly reduce the frequency of maintenance.
These visible cost reductions will eventually turn into real profits for the company. Choosing the right power and speed of the induction motor is to equip the equipment with an efficient “heart”. Don’t let the wrong selection drag down production efficiency! Check your motor against the equipment parameters now to see if it matches. The next time you upgrade your equipment, remember to use these methods to easily save a sum of “wasted money”!