The mechanical characteristics of the motor mech are divided into inherent characteristics and artificial characteristics. Inherent characteristics are also called natural characteristics, which refer to the relationship between load speed and torque on the same shaft under rated conditions. Artificial characteristics refer to the mechanical characteristics when the supply voltage or magnetic flux is not rated, and the armature circuit is connected with an external resistor. In order to measure the flatness of mechanical characteristics, a concept of mechanical characteristic hardness is introduced, that is, the ratio of the torque change to the resulting rotational speed change becomes the mechanical characteristic hardness. It can be divided into three categories: absolute hard characteristics, hard characteristics, and soft characteristics.
Generally speaking, the characteristics of the motor "soft" or "hard" refer to the ability of the motor to resist "interference", that is, the "strain ability" of the motor when the load changes. The characteristics here also refer to the load characteristics. For example, the load suddenly When it increases (larger), the required input current does not increase very much. This characteristic is called "hard characteristic". On the contrary, the characteristic is soft. The "soft" and "hard" characteristics of the motor are related to the electromagnetism of the motor. Design-related. Generally, a motor with a high magnetic field density, a large air gap, and a few winding turns has a harder characteristic; the opposite has a softer characteristic.
