different two-phase hybrid stepping motor

4.1 different two-phase hybrid stepping motor control precision interval Angle is 1.8 °,commonly the control precision of the ac servo motor by the motor shaft after the rotary encoder.Grows with a letter fully digital ac servo motor as an example,For the line with a standard 2000 encoder of the motor,drive due to the internal used four frequency multiplication technology,the pulse equivalent to 360 ° / 8000 = 0.045 °.4.2 low frequency characteristics of sync motor at low speed is easy to appear low frequency vibration phenomenon.Vibration frequency is associated with load and drive acmotortrading.blogspot.com performance,it is generally believed half frequency vibration frequency for the motor no-load takeoff.This kind of Determined by the working principle of stepper motor in low frequency vibration phenomenon is very bad for the normal operation of the machine.When the stepper motor work at low speed,general damping technology should be adopted to overcome the low frequency vibration phenomenon,for example Add damper on the motor,or drive the segmentation technology,etc.Ac servo motor running smoothly,even in the low speed also won't appear when the vibration phenomenon.Ac servo

system has a resonance suppression function,can Covers mechanical rigidity is not enough,and the

6.5hp gasoline generator set system has the function of frequency resolution (FFT),can detect the mechanical resonance point,is advantageous for the system adjustment.

The torque-speed characteristic in 4.3 is not synchronous motor output torque increases with speed decreases,and at a high speed when they fell sharply,so its

maximum working speed is in commonly 300 ~ 600 RPM.Ac servo motor for constant torque Output,that is,at its rated speed (generally is 2000 RPM and 3000 RPM) of less than,can be rated output torque and constant power output above the rated speed for.4.4 overload capacity of sync motor do not generally have overload ability.Ac servo motor has a strong ability of overload.Strong ac servo system with the letter as an example,it has the speed overload and torque overload capacity.Its biggest For more than three times the rated torque and torque can be used to overcome inertia load at startup moments of inertia moment.Stepper motor because there is no this kind of overload capacity,in the selection in order to overcome the inertia moment,often need to choose from Big torque motor and machine during the normal work and does not need so big torque,there is a moment of waste phenomenon.4.5 performance not synchronous motor control for the 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 pumps ensure its 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 can * control performance.4.6 response performance of the asynchronous motor speed accelerate from 0 to work speed (generally for a few hundred revolutions per minute) 200 ~ 200 milliseconds.Better acceleration performance of the ac servo system,grows with a letter HO CC 400 w ac Servo motor as an example,from static accelerated to the rated speed 3000 RPM it takes only a few milliseconds,can be used for quick start-stop control occasions.To sum up,the ac servo system in many performance is superior to step into electricity Machine.But in some occasion not high demand also often use stepper motor to do perform motor.So,in the process of the design of the control system to a comprehensive,with consideration of many factors such as cost control requirements,choose the appropriate Control the motor.