Introduction to closed loop stepping technology
1.Do not lose step
Use of photoelectric encoder feedback motor position constitutes a closed-loop stepping drive system; The traditional stepping motor drive system may cause lost step or stall during sudden load, so it is necessary to reserve a large torque margin; and the closed loop stepping driver will collect the current position information every 50us, and according to the position error information adjusts the current, corrects the position, and prevents step loss.
2.High torque
Ordinary stepping drive systems typically require a 30% torque margin to prevent lost step. Closed-loop stepping can use 100% of the motor torque to improve efficiency. Closed-loop stepping According to the position of the motor detected by the encoder, the magnitude and phase of the current are adjusted during overload, so that the torque of the motor at the current speed is kept to a maximum.
3.Stop without oscillation
The traditional servo system is an error tracking system. When reaching the target position, the error is close to zero, the torque fluctuates in a certain range, causing the shaft to oscillate; and the closed-loop stepping system utilizes the low-speed large torque characteristics of the stepping motor when the motor reaches the target position. No oscillation will occur. This feature is suitable for visual inspection applications.
4.Fast response
The characteristic of the stepping motor is that the rotor is synchronized with the given pulse to achieve fast positioning. Suitable for quick positioning of short distances. The position sampling speed of traditional servo systems is slow and there is a large settling time.
5.List of closed-loop stepping motor
|
Model of closed-loop stepping motor
|
Phase
|
Step angle
（°）
|
Holding torque
（NM)
|
Rated current
(A)
|
Phase inductance
(mH)
|
Phase resistance
(Ohm)
|
Number
|
Rotor inertia
(g.cm²)
|
Shaft diameter
(mm)
|
Encoder resolution
|
Fuselage length
L(mm)
|
|
42BG04-EC
|
2
|
1.8
|
0.48
|
2
|
2.9
|
1.35
|
4
|
77
|
5
|
1000
|
68
|
|
42BG06-EC
|
2
|
1.8
|
0.72
|
2
|
4
|
1.75
|
4
|
110
|
5
|
1000
|
80
|
|
57BG10-EC
|
2
|
1.8
|
1
|
2.8
|
1.2
|
0.8
|
4
|
260
|
8
|
1000
|
77
|
|
57BG20-EC
|
2
|
1.8
|
2
|
4
|
1.8
|
0.8
|
4
|
460
|
8
|
1000
|
98
|
|
60BG30-EC
|
2
|
1.8
|
3
|
5
|
1.8
|
0.45
|
4
|
690
|
8
|
1000
|
108
|
|
86BG40-EC
|
2
|
1.8
|
4
|
6
|
3.5
|
0.8
|
4
|
1400
|
14
|
1000
|
98
|
|
86BG80-EC
|
2
|
1.8
|
8
|
6
|
5.2
|
0.95
|
4
|
2800
|
14
|
1000
|
136
|
|
86BG120-EC
|
2
|
1.8
|
12
|
6
|
8.6
|
0.73
|
4
|
4000
|
14
|
1000
|
172
|
