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NEMA 23 Unipolar 1.8deg 0.82Nm (114oz.in) 57x57x55mm 6 Wires Stepper Motor

NEMA 23 Unipolar 1.8deg 0.82Nm (114oz.in) 57x57x55mm 6 Wires Stepper Motor

Frame Size: 2.3 x 2.3 inch (57 x 57 mm)
Motor Type: Unipolar stepper
Holding Torque: 0.82Nm(114oz-in)
Body Length: 55mm
Available in two models with different voltage, current, resistance, and inductance.
Have the characteristics of high torque, high precision, stable performance, etc.

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Product Introduction

Technical Parameter

Item

Specifications

Step Angle Accuracy

±5%

Resistance Accuracy

±10%

Inductance Accuracy

±20%

Temperature Rise

80K Max.

Ambient Temperature

-20℃~+50℃

Insulation Resistance

100MΩMin.@ 500VDC

Dielectric strength

One minute@500VAC∙5mA Max.

Shaft Radial Play

0.06Max.@450g

Shaft Axial Play

0.08Max.@450g

 

Technical Specification

Model No.

Polar

Rated
Voltage

Current/
Phase

Resistance/
Phase

Inductance/
Phase

Holding
Torque

# of
Leads

Rotor
inertia

Weight

Length
   

V

A

Ω

mH

oz-in

kgf · cm

  

g∙ cm2

kg

mm

57H055H-1006

 Unipolar

7.4

1

7.4

12.5

114

8.2

 6

300

0.7

55

57H055H-2006

3.6

2

1.8

2.5

114

8.2

 

33

 

Pull Out Torque Curve

30

FAQ

Q: Why does the torque of the stepper motor decrease with the increase in speed?

A: The decrease in torque with an increase in speed in a stepper motor is primarily due to two factors: inductance and back EMF (Electromotive Force).

 

1. Inductance: Stepper motors have inductance in their windings, which causes a delay in the current response when the voltage is applied. As the speed of the motor increases, the time available for the current to rise and reach its maximum value within each step decreases. This results in reduced current flow and subsequently reduced torque.

 

2. Back EMF: Back EMF is the voltage generated in the motor windings as a result of the rotor movement. As the speed of the stepper motor increases, the back EMF also increases. The back EMF opposes the applied voltage and limits the effective voltage available to drive the motor. Consequently, the effective voltage across the windings decreases, resulting in a decrease in current and torque.

 

Additionally, the motor's rotor inertia and mechanical limitations can also contribute to the decrease in torque with increasing speed. As the rotor spins faster, the inertia of the rotor becomes more significant, making it more challenging for the motor to accelerate or maintain torque.

 

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