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The difference of motor of stone carving machine
- Feb 02, 2018 -

Stone carving machine power system is stepping motor and servo motor, the control method is very similar, is through signal to control the pulse sequence and direction, but there are big differences in the use of both the performance.

1. Performance is different. Stepper motor for open loop control, start frequency is too high or too much load step easy appear lost or blocked, stops frequently occur high speed overshoot phenomenon, so as to ensure the control accuracy, should handle up, slow down. Ac servo drive system for closed-loop control, the actuator can be directly to the motor encoder feedback signal sampling, internal position loop and speed loop, general won't appear step motor lose step or overshoot phenomenon, more reliable control performance.

The accuracy of the two is different. Two-phase hybrid stepper motor step Angle is 3.6 ° and 1.8 °, step 5 phase hybrid stepping motor is apart from the general 0.72 ° and 0.36 ° Angle; Control accuracy of servo motor by the motor shaft after the rotary encoder, for encoder of the motor with a standard 2500 line, most of the internal drive used four frequency multiplication technology, the pulse equivalent to 360 ° / 10000 = 0.036 °. For with 17 encoder of the motor, drive each receive 217 = 131072 pulse motor turns a circle, namely the pulse equivalent to 360 ° / 131072 = 9.89 seconds. Interval Angle is 1.8 ° is 1/655 of the pulse equivalent of stepper motor. In short, the minimum control precision of servo motor is more than 600 times that of stepping motor.

3. The overload capacity is different. Stepper motor is generally not overloaded. Ac servo motor has strong overload capacity, it has the capacity of speed overload and torque overload. The maximum torque is three times the rated torque, which can be used to overcome the inertia moment of inertia load. Stepper motor because there is no this kind of overload capacity, often need to select a larger torque when the selection of motor, and the machine during the normal work and don't need that big torque, there is a moment of waste phenomenon.