In micromotors, working efficiency is an important reference factor. The efficiency of micromotors is already determined during design and selection. For example, the efficiency of permanent magnet DC motors is higher than that of AC asynchronous motors. Efficiency is also closely related to cost. Now Xinda Motor will talk about how to improve the working efficiency of micro motors.

The efficiency of a micromotor refers to the ratio of its mechanical power to its input power. The mechanical output power is calculated from the required torque and speed. The electrical power input is calculated using the voltage and current supplied to the micromotor. Electrical energy is in different forms. A series of losses will occur during the conversion process, so the mechanical power output is lower than the electrical power input. The design of micromotors is to minimize these losses to improve efficiency.

So to put it simply, to improve the efficiency of micromotors, we need to reduce losses. It seems like a simple problem, but it is actually very complicated. To reduce the losses of micromotors, we must first know what losses there are in micromotors.

Generally, we divide the losses of micromotors into two types, one is mechanical loss and the other is electromagnetic loss, such as copper loss, iron loss, hysteresis loss, etc. To reduce rotor losses, the method is usually to reduce the resistance of the rotor winding, such as using thicker wires with lower resistance, or increasing the rotor slot cross-sectional area. The material of the rotor is also very critical. For example, using a copper rotor, the loss can be reduced to about 15%. Similarly, the stator will suffer the same loss. The method is to increase the slot area of the stator and the full slot rail. If it is a permanent magnet stator winding, the efficiency of the micromotor will also be significantly improved.

The iron loss of micromotors can be effectively reduced by using good quality silicon steel sheets, and increasing the length of the iron core can effectively reduce hysteresis loss.

Some micromotors can reach 90% efficiency. The reason is the use of efficient neodymium magnets and special magnetic circuit design, which enable the micromotors to obtain stronger magnetic flux to reduce electromagnetic losses. In addition, the low-resistance commutator used by micromotors can reduce friction and improve the efficiency of micromotors. In addition, the efficiency of the micro DC motor with ironless design will be very high.