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57 Nema23 Open-Loop Motor：
Holding torque(N.m):1.2，2，3
Body length(mm):56，80,112
Current(A):3
Phase resistance(Q):0.8
Phase inductance(mH):2.4
Detent torque(N.cm):3.5
Moment of inertia(g.cm2):280
phases: 2 phases, 4 lines, 1.8 °: 2phase (2PH), 4Lead
output diameter(mm):8
57 Nema23 Closed-Loop Motor：
Features: Utilizes both FOC control technology and SPWM vector closed-loop control technology to ensure high-speed torque and precision
Encoder: 1000-line magnetic encoder
1.Flange: NEMA23 57MM
2.Step angle: 1.8 degree
3.Phase: 2PH
4.Hold torque: 1.2/2.0/3.0Nm
5.Motor Length: 56/80/112MM
6.Rated Speed: 1000RPM
7.Encoder: 1000line
8.Resistance: 0.4/0.7/0.8(ohm)
9.Inductance: 1.2/2/3.5mH
10.Class of insulation: B
