简单的说，电机转矩是指其转动力量的大小，是电机拖动负载能力的具体表现。在电机产品的性能参数中，以额定转矩、小转矩和大转矩表征其不同状态下的性能指标。

小转矩是电机起动性能的特性，额定转矩是电机额定运行条件下对应的力能指标，而大转矩则反映电机的过载能力；不同的产品特性和使用工况对转矩的要求不同。

对照同中心高、同功率但不同极数的电机可以发现，多极低转速电机的转矩较大，在电机的短路试验中可以发现，较小规格的少极电机，制动相对容易，而多极的低转速电机制动就比较困难。从电机的外观特征比较，除特别小或特别大的规格电机外，同样中心高同功率的电机，低速电机的轴伸直径比较大，因为其运行中承载的负载要比较大，这也是针对于电机转矩特性的尺寸保证要求。

Simply put, motor torque refers to the magnitude of its rotational force, which is a specific manifestation of the motor's ability to drag loads. In the performance parameters of motor products, the performance indicators under different states are characterized by rated torque, minimum torque, and maximum torque.
The minimum torque is a characteristic of motor starting performance, the rated torque is the corresponding force energy index under the rated operating conditions of the motor, and the maximum torque reflects the overload capacity of the motor; Different product characteristics and usage conditions have different requirements for torque.
By comparing motors with the same center and high power but different pole numbers, it can be found that multi pole low speed motors have higher torque. In the short circuit test of the motor, it can be found that small pole motors with smaller specifications are relatively easy to brake, while multi pole low speed motors are more difficult to brake. From the comparison of the appearance characteristics of motors, except for motors with particularly small or large specifications, motors with the same center height and power have a larger shaft extension diameter at low speeds because they carry a larger load during operation, which is also a size guarantee requirement for motor torque characteristics.