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. 535-0338
BrandRS PRO
PHP3,404.26
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. 191-8340
BrandRS PRO
PHP2,501.18
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. 535-0401
BrandRS PRO
PHP2,969.57
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. 180-5291
BrandRS PRO
PHP8,732.00
Each
units
1.8° 3.8 (Unipolar) nm, 4.8 (Parallel) nm, 4.8 (Series) nm 8 2.54 V, 4.76 V, 6.6 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 94mm - 0.85 (Parallel) , 1.7 (Unipolar) , 3.4 (Series) -
RS Stock No. 180-5285
BrandRS PRO
PHP4,366.00
Each
units
1.8° - 6 5.4 V 56.4 x 56.4mm Hybrid 6.35mm 1.5 A Unipolar 19mm 76mm - 3.6Ω -
RS Stock No. 892-8754
BrandRS PRO
PHP7,255.82
Each
units
1.8° 98mNm 4 1.85 V 40 x 34.05mm Hybrid 3mm 500 mA - 10mm 19.4mm 1 3.7Ω -
RS Stock No. 535-0344
BrandRS PRO
PHP3,714.29
Each
units
1.8° 60mNm 4 3.8 V 28 x 28mm Hybrid, Permanent Magnet 5mm 670 mA - 18mm 32mm - 5.6Ω -
RS Stock No. 191-8328
BrandRS PRO
PHP1,789.83
Each
units
1.8° 0.26Nm 8 5 V dc 56.4 x 56.4mm Hybrid 6.35mm 1 A - 79.1mm 38.5mm - -
RS Stock No. 180-5292
BrandRS PRO
PHP12,210.00
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) Ω, 1.42 (Unipolar) Ω, 2.84 (Series) Ω -
RS Stock No. 440-458
BrandRS PRO
PHP4,136.74
Each
units
1.8° 0.50Nm 8 12 V dc 56.4 x 56.4mm Hybrid 6.35mm 600 mA Unipolar 91.1mm 50.5mm - 20Ω -
RS Stock No. 180-5288
BrandRS PRO
PHP4,292.00
Each
units
1.8° - 6 7.4 V 56.4 x 56.4mm Hybrid 6.35mm 1 A Unipolar 19mm 56mm - 7.4Ω -
RS Stock No. 180-5290
BrandRS PRO
PHP7,104.00
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) -
RS Stock No. 180-5289
BrandRS PRO
PHP8,214.00
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. 180-5282
BrandRS PRO
PHP2,553.00
Each
units
1.8° - 6 6 V 56.4 x 56.4mm Hybrid 6.35mm 850 mA Unipolar 19mm 51mm - 7.1Ω -
RS Stock No. 180-5286
BrandRS PRO
PHP5,032.00
Each
units
1.8° - 4 2.8 V 56.4 x 56.4mm Hybrid 6.35mm 3.3 A Unipolar 19mm 76mm - 0.85Ω -
RS Stock No. 180-5293
BrandRS PRO
PHP9,250.00
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. 180-5295
BrandRS PRO
PHP14,060.00
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. 180-5277
BrandRS PRO
PHP2,442.00
Each
units
1.8° - 6 4 V 42.3 x 42.3mm Hybrid 5mm 950 mA Unipolar 22mm 33mm - 4.2Ω -
RS Stock No. 191-8356
BrandRS PRO
PHP2,118.23
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. 180-5281
BrandRS PRO
PHP2,516.00
Each
units
1.8° - 6 12 V 56.4 x 56.4mm Hybrid 6.35mm 400 mA Unipolar 19mm 41mm - 30Ω -
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