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. 829-3525
Mfr. Part No.103H7126-5740
R 762.40
Each
units
1.8° 1.6Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 77.3mm - -
RS stock no. 829-3522
Mfr. Part No.4835728-1
R 45.45
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
RS stock no. 340-3755
Mfr. Part No.34HSX-208
R 3,967.09
Each
units
1.8° 3.8Nm 8 120 V dc 86 x 86mm Permanent Magnet 9.53mm 4.3 A Unipolar 28.6mm - 2 0.75Ω -
RS stock no. 829-3499
Mfr. Part No.103H5205-5240
R 395.27
Each
units
1.8° 0.27Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 34.5mm - 3.4Ω -
RS stock no. 383-1267
Mfr. Part No.53154
R 238.71
Each
units
18° 50mNm 6 12 V dc - Bipolar, Unipolar 1.5mm - Unipolar - - 2 - -
RS stock no. 829-3503
Mfr. Part No.103H5208-5240
R 655.37
Each
units
1.8° 0.39Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 40.5mm - 4.1Ω -
RS stock no. 878-7673
Mfr. Part No.103H7823-1740
R 1,165.93
Each
units
1.8° 2.7Nm 4 24 V dc 60 x 60mm Single Shaft 8mm 4 A Bipolar 19.1mm 87.3mm - 2.4Ω -
RS stock no. 535-0401
BrandRS PRO
R 811.92
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. 829-3516
Mfr. Part No.103H7126-0740
R 1,211.74
Each
units
1.8° 1.27Nm 6 24 V dc 56 x 56mm Hybrid 6.35mm 3 A Unipolar 19.1mm 77.3mm - 0.9Ω -
RS stock no. 440-470
BrandRS PRO
R 1,967.86
Each
units
1.8° 2.2Nm 8 2.5 V dc 82.6 x 82.6mm Hybrid 9.5mm 4.5 A - 152.9mm 94mm - 0.56Ω -
RS stock no. 878-7742
Mfr. Part No.SM2863-5251
R 5,526.46
Each
units
1.8° 9.0Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 6 A Bipolar 28.5mm 128.5mm - 0.46Ω -
RS stock no. 779-3740
Mfr. Part No.FMJ7301CH
R 339.80
Each
units
5.625 °, 11.25 ° 40mNm 5 12 V - Bipolar, Unipolar 3mm 32 mA Unipolar 6mm 19mm - - -
RS stock no. 535-0372
BrandRS PRO
R 655.82
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. 829-3512
Mfr. Part No.103H7123-5740
R 619.17
Each
units
1.8° 1.0Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 53.8mm - - -
RS stock no. 535-0445
BrandRS PRO
R 1,437.25
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. 878-7685
Mfr. Part No.103H7823-5740
R 1,165.97
Each
units
1.8° 2.7Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 2 A Bipolar 19.1mm 87.3mm - 9.5Ω -
RS stock no. 440-420
BrandRS PRO
R 368.99
Each
units
1.8° 70mNm 6 5 V dc 40 x 40mm Hybrid 5mm 500 mA Unipolar 73mm 33mm - 10Ω -
RS stock no. 440-436
BrandRS PRO
R 550.53
Each
units
1.8° 70mNm 6 12 V dc 40 x 40mm Hybrid 5mm 160 mA - 73mm 33mm - 75Ω -
RS stock no. 892-8741
BrandRS PRO
R 3,144.73
Each
units
1.8° 2.2Nm 8 4.17 V, 6 V, 8.4 V 60 x 60mm Hybrid, Permanent Magnet 7.5mm 2 A Parallel, Series, Unipolar 22.4mm 110mm 1 -
RS stock no. 440-464
BrandRS PRO
R 1,512.06
Each
units
1.8° 1.2Nm 8 3 V dc 82.6 x 82.6mm Hybrid 9.5mm 2 A Unipolar 121.4mm 62.5mm - 1.5Ω -