Stepper motors are generally chosed according to the torque and working speed required. What is the relationship between power and power? Power = torque * speed. In other words, we can't just look at the result of torque* speed, but how to distribute between the torque and speed, two factors. We should refer to the step frequency of stepper motor to select stepper motor.

       For example, the load characteristic is 300 rpm, working speed and  2 NM holding torque. If you are going to select a working speed of 1200 rpm, a stepping motor with a torque output of 0.5 nm isnot likely to meet the requirements, although they have the same power. The former should consider the selection of 60mm series stepper motors, while the latter, 56mm series stepper motors,can meet the requirements. This is because the frequency characteristics of the stepper motor are not linear with speed and torque. The stepping motor with different parameters is suitable for different speeds, and the high current and low inductance stepping motor is suitable for running at high speed, while the low current and high inductance stepping motor is suitable for running at low speed.

       Another important reason is that the frequency characteristics of the same stepper motor will change greatly if the condition of stepper motor driver changes. For example, the driving voltage is increased from 24V to 48V, and the output power of the stepping motor at low speed does not change much, but the output power will increase a lot when running at high speed.

       Why is the distance meter of the stepper motor only used for reference because different driver, and different subdivision number and the excitation mode will affect the output torque of the stepping motor. At the same time, the starting torque curve is also related to the moment of load inertia. Therefore, when checking the distance map, pay attention to confirm test conditions for the graph. In addition, the stepping motor also has a certain range of fluctuations within the specification value range. For example, the general resistance value has a tolerance of ±10%, and the inductance has a tolerance of ±20%. The result of the template test is the same as that of the actual motor used by the same manufacturer. There are also some differences in the models to leave enough time when choosing a stepper motor.