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NEMA 17 Unipolar 0.9deg 0.29Nm (40.3oz.in) 0.4A 12V 42x42x47mm 6 Wires Stepper Motor

NEMA 17 Unipolar 0.9deg 0.29Nm (40.3oz.in) 0.4A 12V 42x42x47mm 6 Wires Stepper Motor

Manufacturer Part Number: 42H047HM-0406
Frame Size: 42x42mm
Motor Type: Bipolar Stepper
Step Angle: 0.9 deg
Holding Torque: 0.9Nm(40.3oz-in)
Rated Current/phase: 0.4 A
Rated Voltage: 12 V
Phase Resistance: 30 Ω
Inductance: 42 mH ± 20%(1KHz)
Body Length: 47 mm

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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
42H047HM-0406 Unipolar 12 0.4 30 42 40.3 2.9 6 68 0.35 47

 

31

 

Pull Out Torque Curve

30

FAQ

Q: What are the disadvantages of open-loop control of stepper motors?

A:1. Lack of Position Feedback: Open-loop control systems do not have direct feedback on the motor's actual position. This means that any positioning errors or disturbances cannot be corrected unless compensated for in the control algorithm or mechanically designed out.

 

2. Potential for Missed Steps: Open-loop control systems are vulnerable to missed steps if the motor is subjected to excessive loads, torque demands, or acceleration rates beyond its capabilities.

 

3. Limited Adaptability to Changing Conditions: Open-loop control systems are less adaptable to changing conditions or variations in load. They cannot dynamically adjust the motor's operation based on real-time feedback. This can lead to accuracy issues if there are changes in the external load, environmental conditions, or motor characteristics.

 

4. Reduced Fault Detection: Open-loop control systems do not have built-in fault detection mechanisms. In case of motor malfunctions, such as winding or driver failures, the control system may not be aware of the fault, and the motor may continue to operate incorrectly, leading to potential damage or safety risks.

 

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