Stepper Motors

A stepper motor is used as an output in electronic circuits. The motor is a brushless DC electric motor that divides a full rotation into a number of equal steps.

The motor’s position can then be made to move and hold at one of these steps without any position sensor for feedback as long as the motor is carefully sized to the application in respect to torque and speed.

Multiple coils are organised in phases (groups). By energising each phase in sequence the motor will rotate, one step at a time.

Why and when to use a Stepper Motor?

With a computer controlled stepping you can achieve very precise positioning and/or speed control.
•Steppers move in precise repeatable steps, they are perfect to use where precise positioning is needed such as 3D printers, CNC and camera platforms.


•Some disk drives use stepper motors to position the read/write head.


•Precise increments of movement also allow for excellent control of rotational speed for process automation and robotics.


•A Stepper motor has maximum torque at low speeds, so they are a good choice for applications where low speed with high precision is needed.



Stepper motor types
•Bipolar drivers use H bridge circuitry to reverse the current flow through the phases. By energising the phases with alternating the polarity all the coils can be put to work turning the motor.


•Permanent magnet motors use a permanent magnet in the rotor. They operate based on the principle that minimum reluctance occurs with minimum gap, meaning the rotor points are attracted towards the stator magnet poles.


•Unipolar drivers always energise the groups in the same way. The common lead will always be negative. They can be implemented with simple transistor circuitry.



Advantages of step motors
•Low cost


•High reliability


•High torque at low speed


•Full torque at standstill

...
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Description Price Step Angle Holding Torque Number Of Wires Voltage Rating Frame Size Stepper Motor Type Shaft Diameter Current Rating Winding Arrangement Shaft Length Depth Number of Pole Pairs Resistance Per Phase Detent Torque
RS Stock No. 191-8356
BrandRS PRO
$73.73
Each
units
1.8° 0.49Nm 8 12 V dc 56.4 x 56.4mm Hybrid 6.35mm 600 mA - 91.1mm 50.5mm - 20Ω -
RS Stock No. 535-0401
BrandRS PRO
$98.37
Each
units
0.9° 0.44Nm 4 2.8 V 42.3 x 42.3mm Hybrid 5mm 1.68 A - 24mm 47mm - 1.65Ω -
RS Stock No. 440-420
BrandRS PRO
$69.25
Each
units
1.8° 70mNm 6 5 V dc 40 x 40mm Hybrid 5mm 500 mA Unipolar 73mm 33mm - 10Ω -
RS Stock No. 535-0439
BrandRS PRO
$146.43
Each
units
1.8° 1.26Nm 4 2.5 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A - 19mm 56mm - 0.9Ω 42mNm
RS Stock No. 535-0372
BrandRS PRO
$73.10
Each
units
0.9° 2.2mNm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.33 A - 22mm 33mm - 2.1Ω -
RS Stock No. 535-0502
BrandRS PRO
$129.23
Each
units
0.9° 1.26Nm 4 2.5 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A Unipolar 19mm 56mm - 0.9Ω -
RS Stock No. 798-3646
BrandRS PRO
$216.21
Each
units
1.8° 1.96Nm 6 4.4 V dc 85.8 x 85.8mm Bipolar, Unipolar 14mm 2 A Unipolar 137mm 66mm - 2.2Ω -
RS Stock No. 892-8732
BrandRS PRO
$53.92
Each
units
1.8° 0.36Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.68 A - 22mm 62mm 1 1.65Ω -
RS Stock No. 535-0467
BrandRS PRO
$50.62
Each
units
1.8° 0.22Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.33 A - 22mm 33mm - 2.1Ω -
RS Stock No. 535-0445
BrandRS PRO
$157.38
Each
units
1.8° 1.89Nm 4 3.2 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A - 19mm 76mm - 1.13Ω 72mNm
RS Stock No. 191-8340
BrandRS PRO
$62.33
Each
units
1.8° 0.49Nm 8 12 V dc 56.4 x 56.4mm Hybrid 6.35mm 480 mA - 91.1mm 50.5mm - 25Ω -
RS Stock No. 892-8723
BrandRS PRO
$112.43
Each
units
1.8° 0.21Nm 4 9 V 39.2 x 39.2mm Hybrid, Permanent Magnet 5mm 600 mA - 22mm 58mm 1 15Ω -
RS Stock No. 892-8726
BrandRS PRO
$134.90
Each
units
1.8° 30mNm 4 4.32 V 20.2 x 20.2mm Hybrid, Permanent Magnet 4mm 800 mA - 5mm 48.5mm 1 5.4Ω -
RS Stock No. 918-0849
BrandRS PRO
$27.76
Each
units
15° 10mNm 4 24 V 42mm Permanent Magnet 2mm - Unipolar 6.5mm 24.5mm - 500Ω -
RS Stock No. 535-0489
BrandRS PRO
$62.37
Each
units
1.8° 0.44Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.68 A - 22mm 47mm - 1.65Ω -
RS Stock No. 535-0366
BrandRS PRO
$162.99
Each
units
1.8° 0.12Nm 4 6.2 V 28 x 28mm Hybrid, Permanent Magnet 5mm 670 mA - 18mm 51mm - 9.2Ω -
RS Stock No. 535-0338
BrandRS PRO
$95.57
Each
units
1.8° 17.5mNm 4 3.96 V 20.2 x 20.2mm Hybrid, Permanent Magnet 4mm 600 mA - 5mm 33mm - 6.5Ω -
RS Stock No. 180-5284
BrandRS PRO
$128.77
Each
units
1.8° - 4 2.38 V 56.4 x 56.4mm Hybrid 6.35mm 2.8 A Unipolar 19mm 51mm - 0.85Ω -
RS Stock No. 798-3643
BrandRS PRO
$216.21
Each
units
1.8° 1.76Nm 6 5.1 V dc 56.4 x 56.4mm Bipolar, Unipolar 6.35mm 3 A Unipolar 139.6mm 103mm - 1.7Ω -
RS Stock No. 918-0846
BrandRS PRO
$67.04
Each
units
15° 72mNm 4 24 V 59.8mm Permanent Magnet 3mm - Unipolar 7mm 60mm - 122Ω -
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