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. 829-3522
Mfr. Part No.4835728-1
€2.96
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 798-3634
BrandRS PRO
€75.69
Each
units
1.8° 1.32Nm 6 8.6 V dc 56.4 x 56.4mm Bipolar, Unipolar 6.35mm 1 A Unipolar 114.1mm 77.5mm - 8.6Ω -
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. 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. 878-7764
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. 798-3628
BrandRS PRO
€39.88
Each
units
1.8° 0.16Nm 6 4 V dc 42 x 42mm Bipolar, Unipolar 5mm 950 mA Unipolar 68mm 33mm - 4.2Ω -
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. 798-3640
BrandRS PRO
€113.93
Each
units
1.8° 4.31Nm 6 6.4 V dc 85.8 x 85.8mm Bipolar, Unipolar 14mm 2 A Unipolar 167mm 96mm - 3.2Ω -
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. 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. 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. 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. 798-3630
BrandRS PRO
€55.48
Each
units
1.8° 0.83Nm 6 7.4 V dc 56.4 x 56.4mm Bipolar, Unipolar 6.35mm 1 A Unipolar 91.6mm 55mm - 7.4Ω -
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. 878-7705
Mfr. Part No.4837961-1
€5.62
Each
units
1.8° - 4 - - Bipolar, Unipolar - - Bipolar - - - - -
RS Stock No. 829-3528
Mfr. Part No.4835710-1
€2.96
Each
units
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 921-1347
Mfr. Part No.AM0820-V3-18-08 C06.072A 08/1 256:1
BrandFaulhaber
€468.65
Each
units
18° 0.65mNm 4 3 V dc - Bipolar, Unipolar 2.34mm 150 mA Bipolar 3.85mm 16.75mm 2 18Ω 0.17mNm
RS Stock No. 136-6703
Mfr. Part No.2H4248U12R220
€137.19
Each
units
1.8° 0.37Nm 6 36 V 42 x 42mm Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 3.3Ω -
RS Stock No. 136-6707
Mfr. Part No.2H4248U12S340
€177.88
Each
units
1.8° 0.37Nm 6 36 V 42 x 42mm Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 3.3Ω -
RS Stock No. 892-9316
Mfr. Part No.35L048D1B
BrandPortescap
€47.42
Each
units
7.5° 54mNm - - - Bipolar, Unipolar 2mm 450 mA - - 32.38mm - - -