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. 383-1267
Mfr. Part No.53154
€14.83
Each
units
18° 50mNm 6 12 V dc - Bipolar, Unipolar 1.5mm - Unipolar - - 2 - -
RS Stock No. 351-4574
Mfr. Part No.M82201-P2SB
€35.73
Each
units
7.5° 25mNm - 12 V dc - Permanent Magnet 2mm 180 mA Unipolar - - 2 - -
RS Stock No. 440-284
Mfr. Part No.82920012
BrandCrouzet
€39.28
Each
units
7.5° 57mNm 6 12.9 V - Permanent Magnet 2mm 280 mA Unipolar 7.4mm 25.6mm 2 46Ω -
RS Stock No. 878-7764
Mfr. Part No.103H7123-0410
€64.63
Each
units
1.8° 0.83Nm 6 24 V dc 56 x 56mm Bipolar, Unipolar 6.35mm 2 A Unipolar 19.1mm 55.3mm - 1.6Ω -
RS Stock No. 779-3740
Mfr. Part No.FMJ7301CH
€16.98
Each
units
5.625 °, 11.25 ° 40mNm 5 12 V - Bipolar, Unipolar 3mm 32 mA Unipolar 6mm 19mm - - -
RS Stock No. 878-7673
Mfr. Part No.103H7823-1740
€110.72
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. 878-7761
Mfr. Part No.103H5208-5210
€43.77
Each
units
1.8° 0.39Nm 4 24 V dc 42 x 42mm Bipolar, Unipolar 5mm 1 A Bipolar 22.5mm 40.5mm - 4.1Ω -
RS Stock No. 440-262
Mfr. Part No.82910003
BrandCrouzet
€36.96
Each
units
7.5° 20mNm 6 12.7 V dc - Permanent Magnet 2mm 190 mA Unipolar 7.8mm 21.7mm 2 66Ω -
RS Stock No. 878-7685
Mfr. Part No.103H7823-5740
€110.72
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. 829-3499
Mfr. Part No.103H5205-5240
€43.00
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. 878-7733
Mfr. Part No.SM2862-5251
€257.47
Each
units
1.8° 6.4Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 6 A Bipolar 28.5mm 98mm - 0.36Ω -
RS Stock No. 878-7660
Mfr. Part No.SH3537-12U40
€65.11
Each
units
1.8° 0.15Nm 6 24 V dc 35 x 35mm Single Shaft 5mm 1.2 A Unipolar 18mm 39mm - 2.7Ω -
RS Stock No. 455-2549
Mfr. Part No.53467
€18.62
Each
units
7.5° 3mNm - 12 V dc 36mm Bipolar, Unipolar - - Unipolar - - 2 - -
RS Stock No. 829-3496
Mfr. Part No.103H5205-0440
€43.00
Each
units
1.8° 0.20Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 34.5mm - 2.24Ω -
RS Stock No. 878-7667
Mfr. Part No.103H7823-0440
€110.72
Each
units
1.8° 2.1Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 2 A Unipolar 19.1mm 87.3mm - 2.7Ω -
RS Stock No. 877-7247
Mfr. Part No.STM23IP-2EE
€718.60
Each
units
1.8° 0.88Nm 8 12 → 70 V dc 42mm Dual Hybridge 6.35mm 5 A - 18.4mm 92.4mm - - -
RS Stock No. 878-7755
Mfr. Part No.103H5205-0410
€41.26
Each
units
1.8° 0.20Nm 6 24 V dc 42 x 42mm Bipolar, Unipolar 5mm 1.2 A Unipolar 22.5mm 34.5mm - 2.4Ω -
RS Stock No. 351-4631
Mfr. Part No.P542-M481U-G17L82
€68.56
Each
units
7.5° 1.0Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 878-7657
Mfr. Part No.SH3533-12U40
€99.12
Each
units
1.8° 0.12Nm 6 24 V dc 35 x 35mm Single Shaft 5mm 1.2 A Unipolar 18mm 35mm - 2.4Ω -
RS Stock No. 878-7711
Mfr. Part No.103H8223-6340
€322.38
Each
units
1.8° 7.44Nm 4 100 V ac 85.85 x 85.85mm Single Shaft 12mm 6 A Bipolar 28.48mm 127.42mm - 0.45Ω -
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