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. 798-3659
BrandRS PRO
€193.66
Each
units
1.8° 6.47Nm 6 7.6 V dc 85.8 x 85.8mm Bipolar, Unipolar 14mm 2 A Unipolar 197mm 126mm - 3.8Ω -
RS Stock No. 892-8735
BrandRS PRO
€81.06
Each
units
1.8° 0.78Nm 8 2.1 V, 3 V, 4.2 V 60 x 60mm Hybrid, Permanent Magnet 7.5mm 2 A Parallel, Series, Unipolar 22.4mm 69mm 1 1.5Ω -
RS Stock No. 191-8340
BrandRS PRO
€33.20
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. 798-3646
BrandRS PRO
€116.12
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. 440-470
BrandRS PRO
€113.98
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. 892-8723
BrandRS PRO
€62.05
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. 191-8356
BrandRS PRO
€34.46
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. 892-8739
BrandRS PRO
€112.61
Each
units
1.8° 1.17Nm 8 2.52 V, 3.6 V, 5.04 V 60 x 60mm Hybrid, Permanent Magnet 7.5mm 2 A Parallel, Series, Unipolar 22.4mm 80mm 1 1.8Ω -
RS Stock No. 535-0338
BrandRS PRO
€52.74
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. 798-3643
BrandRS PRO
€116.12
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. 191-8362
BrandRS PRO
€51.36
Each
units
1.8° 0.88Nm 8 5.4 V dc 56.4 x 56.4mm Hybrid 6.35mm 1.4 A - 116.6mm 76mm - 3.6Ω -
RS Stock No. 892-8741
BrandRS PRO
€192.30
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. 892-8729
BrandRS PRO
€37.21
Each
units
1.8° 65mNm 4 2.64 V 39.2 x 39.2mm Hybrid, Permanent Magnet 5mm 400 mA - 22mm 44mm 1 6.6Ω -
RS Stock No. 180-5295
BrandRS PRO
€209.69
Each
units
1.8° - 4 2.56 V 85.85 x 85.85mm Hybrid 12.7mm 5.5 A - 30.23mm 96mm - 0.46Ω -
RS Stock No. 180-5292
BrandRS PRO
€183.01
Each
units
1.8° 6.2 (Unipolar) nm, 7.6 (Parallel) nm, 7.6 (Series) nm 8 3.47 V, 4.97 V, 6.95 V 82.5 x 82.5mm Hybrid 9.52mm 2.45 (Series) A, 3.5 (Unipolar) A, 4.9 (Parallel) A Parallel, Series, Unipolar 28.9mm 125mm - 0.71 (Parallel) , 1.42 (Unipolar) , 2.84 (Series) -
RS Stock No. 180-5289
BrandRS PRO
€122.94
Each
units
1.8° - 6 8.6 V 56.4 x 56.4mm Hybrid 6.35mm 1 A Unipolar 19mm 76mm - 8.6Ω -
RS Stock No. 180-5293
BrandRS PRO
€138.09
Each
units
1.8° 2.6 (Unipolar) nm, 3.4 (Parallel) nm, 3.4 (Series) nm 8 1.65 V, 2.39 V, 3.42 V 85.85 x 85.85mm Hybrid 12mm 3 (Series) A, 4.2 (Unipolar) A, 5.9 (Parallel) A Parallel, Series, Unipolar 30.23mm 65mm - 0.28 (Parallel) , 0.57 (Unipolar) , 1.14 (Series) -
RS Stock No. 440-464
BrandRS PRO
€89.60
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 -
RS Stock No. 918-0846
BrandRS PRO
€37.00
Each
units
15° 72mNm 4 24 V 59.8mm Permanent Magnet 3mm - Unipolar 7mm 60mm - 122Ω -
RS Stock No. 180-5290
BrandRS PRO
€106.42
Each
units
1.8° 2.3 (Unipolar) nm, 2.8 (Parallel) nm, 2.8 (Series) nm 8 2.54 V, 3.64 V, 5 V 82.5 x 82.5mm Hybrid 9.52mm 1.96 (Series) A, 2.8 (Unipolar) A, 3.92 (Parallel) A Parallel, Series, Unipolar 28.9mm 67mm - 0.65 (Parallel) , 1.3 (Unipolar) , 2.6 (Series) -
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