The stone carving machine is damaged. Let's see how to solve it first. If the spindle motor of the stone engraving machine is hot and hot, we must pay attention. If it is not handled early, the lubrication and service life of the spindle bearing of the machine tool will be affected, and the use of the overall spindle will also be affected.

步进电机内部结构全部都是由铁芯和绕组线圈组成的。绕组有电阻，通电会形成损耗，损耗大小与电阻和电流的平方成正比，这就是铜陨，假如电流不是标准的直流或正弦波，还会形成谐波损耗；铁心有磁滞涡流效应，在交变磁场中也会形成损耗，其大小与材料、电流、频率、电压有关，这叫铁损。

The internal structure of stepping motor is composed of iron core and winding coil. If the winding has resistance, power on will form loss. The loss is directly proportional to the square of resistance and current. This is copper meteorite. If the current is not standard DC or sine wave, it will also form harmonic loss; The iron core has hysteresis eddy current effect and will also form loss in alternating magnetic field. Its size is related to material, current, frequency and voltage, which is called iron loss.

铜损和铁损都会以发热的形式表现出来，从而影响电机的效率。步进电机通常追求定位精度和力矩输出，效率比较低，电流通常比较大，且谐波成分高，电流交变的频率也随转速而变化，因此步进电机普遍存在发热状况，且状况比通常交流电机严重。

Copper loss and iron loss will be expressed in the form of heating, which will affect the efficiency of the motor. Stepper motors usually pursue positioning accuracy and torque output, with low efficiency, large current and high harmonic component, and the frequency of current alternating also changes with speed. Therefore, stepper motors generally have heating conditions, which are more serious than ordinary AC motors.

步进电机发热的合理范围电机发热允许程度：

Reasonable range of stepper motor heating allowable degree of motor heating:

主要取决于电机内部结构绝缘等级。内部结构绝缘性能在高温下(130度以上)才会被破坏。因此只要内部结构不超过130度，电机便不会毁坏，而这时外表温度会在90度以下。因此，步进电机外表温度在70-80度全部都是正常的。简单的温度测量方法有用点温计的，也可以粗略判断：拿手可以触摸1-2秒以上，不超过60度；拿手只能碰一下，大约在70-80度；滴几滴水迅速气化，则90度以上了。

It mainly depends on the insulation grade of the internal structure of the motor. The insulation performance of the internal structure will be damaged only at high temperature (above 130 degrees). Therefore, as long as the internal structure does not exceed 130 degrees, the motor will not be damaged, and the external temperature will be below 90 degrees. Therefore, the stepper motor surface temperature is normal at 70-80 degrees. The simple temperature measurement method can be measured with a point thermometer, or it can be roughly judged: you can touch it for more than 1-2 seconds, no more than 60 degrees; You can only touch it, about 70-80 degrees; A few drops of water vaporize rapidly, and it is more than 90 degrees.