The principle of stepping drive _60 stepper motor design
say first how it works:
stepper motor is a kind of electrical pulses into angular displacement of the actuator. When stepping drive receives a pulse signal, it is driving a stepper planetary gear motor according to set the direction of a fixed point of view, its rotation is based on the Angle of the fixed step by step.
can be controlled by controlling the pulse number of angular displacement, so as to achieve the purpose of accurate positioning; As well as by controlling the pulse frequency to control motor rotation speed and acceleration, so as to achieve the purpose of regulating.
the inside of the servo motor rotor is a permanent magnets, drive control of U/V/W three-phase electric form of electromagnetic field, under the action of rotating rotor in this field, at the same time, the motor with encoder feedback signal to drive, drive according to the feedback value compared with the target, adjust the Angle of the rotor rotation. The precision of servo motor is determined by the precision of the encoder ( Line number) 。
difference: control the way
is stepping motor by controlling the number of pulse control rotation Angle, a pulse interval Angle corresponding to a. Servo motor is controlled by controlling the length of the pulse time of rotation Angle.
the difference between 2: the required working equipment and working process of different
power supply needed for the stepper motor ( The voltage required parameters given by the driver) And a pulse generator ( Now mostly use plate) , a stepper motor, a drive ( Drive set interval Angle, such as setting step away from the Angle of 0. 45° Walk, at this time, to a pulse, motor 0. 45° ) ; Its work process work for stepper motor general need two pulses, pulse signal pulse and direction.
servo motor power supply is required for a switch ( Relay switch or relay board) A servo motor; Its working process is a switch power supply connection, then connect the servo motor.
the difference between 3: low frequency characteristics of different
stepper motor at low speed is easy to appear low frequency vibration phenomenon. Vibration frequency is associated with load and drive performance, it is generally believed half frequency vibration frequency for the motor no-load takeoff. This 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, such as a damper on the planetary gear 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 with functions of resonance, can cover mechanical rigidity is not enough, and the system has the function of frequency resolution ( FFT) , can detect the mechanical resonance point, is advantageous for the system adjustment.
4: difference between torque frequency characteristics different
stepper motor's output torque increases with speed decreases, and at a high speed when they fell sharply, so its high working speed is in commonly 300 ~ 600 r/min.
ac servo planetary gear motor as the constant torque output, namely in the rated speed ( General is 2000 or 3000 r/min) Less than, can be rated output torque, in for a constant power output above the rated speed.
the difference between 5: different overload capacity
step motor is generally not have overload ability.
ac servo motor has the strong ability of overload. Panasonic ac servo system, for example, it has the speed overload and torque overload capacity. Its torque is three times the amount of torque that 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 order to overcome the inertia moment when selection, often need to select a larger torque of the motor, and the machine during the normal work and don't need that big torque, torque waste phenomenon appeared)
the difference between 6: speed response performance different
stepper motor to accelerate from 0 to speed ( Generally for a few hundred revolutions per minute) Need 200 ~ 400 ms. Ac servo system has good acceleration
to put it bluntly, is extremely logarithm, more speed is slow, the control Angle, pin more power lines are stepping motor, and lower power. And high precision, fast speed, can be applied to the speed, position and torque control of occasions, are UVW three lines, power lines are usually servo motor. And usually logarithmic not more than 5, from dozens of watts of power to tens of kilowatts.
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