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Engraving machine compare - stepping motor and servo motor - Engraving machine _ _ _ _ CNC woodworking engraving machine engraving machine carving factory house
by：Transon
2020-07-17
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engraving machine can be divided for step motor and servo motor, this is common in carving machine configuration, then contrast different about stepping motor and servo motor, the carving machine to introduce, convenient for different customers to choose.
1, the different control precision
than stepping motor servo motor, the accuracy of both is different. Two-phase hybrid stepper motor step Angle is commonly 3. 6°、 1. Step 8 °, 5 phase hybrid stepping motor is apart from the Angle of general to 0. 72 °、0. 36°； 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. In 89 seconds. Step is from Angle of 1. 8 ° stepper motor of 1/655 of the pulse equivalent. Simple said is the smallest of the servo motor is a stepper motor control precision of more than six hundred times.
in the case of low speed, Generally refers to 600 RPM) High precision stepper motor as servo motor, under the condition of high speed, Generally refers to 1200 RPM) Stepper motor due to its characteristics of torque decline will cause losing step no servo precision is high, so step used in relatively low speed situation, servo used in high speed.
2, the low frequency characteristics of different
step motor in low frequency vibration phenomenon is seen when the ac servo motor at low speed running smoothly, even in low speed vibration phenomenon will not appear when
stepper motor output speed is lower than the servo motor, stepping motor speed is not stable, 300 to 600 floating, servo motor for the constant power output, 2000 or 3000. Stepper motor's 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, in its rated speed ( General is 2000 RPM and 3000 RPM) Less than, can be rated output torque, in for a constant power output above the rated speed.
3, overload capacity is not the same as
step motor is generally not have overload ability. Ac servo motor has a strong ability of overload. Stepper motor is generally not have overload ability. Ac servo motor has the strong ability of overload, it has a speed of overload and torque overload capacity. The maximum torque is three times the rated 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, 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.
4, performance is not the same as
running performance, Servo motor step will not be lost or the phenomenon of overshoot, high stability) Internal constitutional position loop and speed loop, general won't appear step motor lose step or overshoot phenomenon, more reliable control performance. 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.
5, different speed response performance
stepper motor to accelerate from 0 to speed ( Generally for a few hundred revolutions per minute) Need to 200 ~ 400 milliseconds. Better acceleration performance of the ac servo system, a panasonic MSMA 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.
6, the control mode
stepper motor open-loop control, there is no feedback, so control is simple, only need to match a drive, pulse control part; Servo motor control is relatively more complicated.
7, price: step into cheap, servo you
above all
servo system in many performance is better than the stepping motor. 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 proper control motors.
engraving machine can be divided for step motor and servo motor, this is common in carving machine configuration, then contrast different about stepping motor and servo motor, the carving machine to introduce, convenient for different customers to choose.
1, the different control precision
than stepping motor servo motor, the accuracy of both is different. Two-phase hybrid stepper motor step Angle is commonly 3. 6°、 1. Step 8 °, 5 phase hybrid stepping motor is apart from the Angle of general to 0. 72 °、0. 36°； 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. In 89 seconds. Step is from Angle of 1. 8 ° stepper motor of 1/655 of the pulse equivalent. Simple said is the smallest of the servo motor is a stepper motor control precision of more than six hundred times.
in the case of low speed, Generally refers to 600 RPM) High precision stepper motor as servo motor, under the condition of high speed, Generally refers to 1200 RPM) Stepper motor due to its characteristics of torque decline will cause losing step no servo precision is high, so step used in relatively low speed situation, servo used in high speed.
2, the low frequency characteristics of different
step motor in low frequency vibration phenomenon is seen when the ac servo motor at low speed running smoothly, even in low speed vibration phenomenon will not appear when
stepper motor output speed is lower than the servo motor, stepping motor speed is not stable, 300 to 600 floating, servo motor for the constant power output, 2000 or 3000. Stepper motor's 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, in its rated speed ( General is 2000 RPM and 3000 RPM) Less than, can be rated output torque, in for a constant power output above the rated speed.
3, overload capacity is not the same as
step motor is generally not have overload ability. Ac servo motor has a strong ability of overload. Stepper motor is generally not have overload ability. Ac servo motor has the strong ability of overload, it has a speed of overload and torque overload capacity. The maximum torque is three times the rated 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, 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.
4, performance is not the same as
running performance, Servo motor step will not be lost or the phenomenon of overshoot, high stability) Internal constitutional position loop and speed loop, general won't appear step motor lose step or overshoot phenomenon, more reliable control performance. 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.
5, different speed response performance
stepper motor to accelerate from 0 to speed ( Generally for a few hundred revolutions per minute) Need to 200 ~ 400 milliseconds. Better acceleration performance of the ac servo system, a panasonic MSMA 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.
6, the control mode
stepper motor open-loop control, there is no feedback, so control is simple, only need to match a drive, pulse control part; Servo motor control is relatively more complicated.
7, price: step into cheap, servo you
above all
servo system in many performance is better than the stepping motor. 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 proper control motors.
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