Maintenance of brushless stepper motor

To understand why the brushless stepper motor generates heat. For various brushless stepping motors, the interior is composed of iron core and winding coils. If there is a winding, there will be resistance, and there will be loss when it is energized. The loss is proportional to the square of the resistance and the current. This is what we often call copper loss. If the current is not a standard DC or sine wave, harmonic loss will also be generated; the iron core has a hysteresis eddy current effect, and loss will also occur in an alternating magnetic field. Its size is related to the material, current, frequency, and voltage, which is called iron loss . Copper loss and iron loss will show up in the form of heat, which affects the efficiency of the motor. Stepping motors generally pursue positioning accuracy and torque output for the purpose. The efficiency is generally low, the current is generally large, and the harmonic components are high. The frequency of the current alternating will also change with the speed. Therefore, the stepping motor generally has heat generation. , And the situation is more serious than ordinary AC motors.　

   Secondly, control the heating of the brushless stepper motor within a reasonable range. The degree to which the motor can allow heating depends mainly on the level of insulation material inside the motor. The internal insulation performance will only be destroyed at high temperatures (above 130 degrees). So as long as the interior does not exceed 130 degrees, the motor will not be damaged, and the surface temperature will be below 90 degrees at this time. Therefore, the surface temperature of the stepper motor is normal at 70-80 degrees. A simple method of temperature measurement can be a point thermometer or a rough judgment: it can be touched by hand for more than 1-2 seconds, not exceeding 60 degrees; it can only be touched by hand, about 70-80 degrees; dripping a few drops of water quickly The temperature is over 90 degrees; of course, it can also be detected with a temperature measuring gun.

   The structure of the brushless stepper motor is very simple. It is composed of a combination of a driver and a motor. It is a relatively traditional electromechanical integrated device. The brushless stepper motor is a commutator and a brushless motor, as early as when the motor was born. The motors that have just started are in the form of brushless motors. Slowly, the scope of use of this kind of motors has become wider and wider. Because asynchronous motors have some problems that have not been overcome, the development of motors has been very slow over the years. , We should always pay attention to where the motor overheating problem occurs:

a. It may be that the steering shaft of the motor is deformed, the front cover of the motor and the bearing are not installed neatly before, too much or too little lubricating oil, and the bearing is deformed and offset, and there is no correction between the motor and the coupling, which leads to the belt. Tight.

　　B. The load is too small, but the motor speed is still too fast.

　　C. It has the advantages of traditional motors, but there is no carbon brush and slip ring structure.

　　D. It can also run at high power and low speed so that the reducer will not drive a large load.