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. 829-3503
Mfr. Part No.103H5208-5240
€43.64
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. 829-3534
Mfr. Part No.SH2141-5541
€112.76
Each
units
1.8° 6.5mNm 4 24 V dc 14 x 14mm Hybrid 4mm 300 mA Bipolar 13.5mm 31.5mm - 21Ω -
RS Stock No. 368-0277
Mfr. Part No.26M048B-1U
€31.81
Each
units
7.5° 9.0mNm 6 5 V dc - Permanent Magnet 2mm 250 mA Unipolar 9.78mm 13.72mm 2 19.6Ω -
RS Stock No. 878-7768
Mfr. Part No.103H7123-0440
€63.83
Each
units
1.8° 0.83Nm 6 24 V dc 56 x 56mm Single Shaft 6.35mm 2 A Unipolar 19.1mm 55.3mm - 1.6Ω -
RS Stock No. 877-7238
Mfr. Part No.STM23Q-2RE
€704.89
Each
units
1.8° 0.88Nm 8 12 → 70 V dc 23mm Dual Hybridge 6.35mm 5 A - 18.4mm 92.4mm - - -
RS Stock No. 368-0283
Mfr. Part No.26M048B-2U
€35.09
Each
units
7.5° 9.0mNm 6 12 V dc - Permanent Magnet 2mm 100 mA Unipolar 9.78mm 13.72mm 2 110Ω -
RS Stock No. 829-3547
Mfr. Part No.SS2422-5041
€61.72
Each
units
1.8° 18.6mNm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 7mm 18.6mm - 5.4Ω -
RS Stock No. 892-9299
Mfr. Part No.20M020D2B
BrandPortescap
€31.23
Each
units
18° 11mNm - - - Permanent Magnet 1.5mm 100 mA - - 24.88mm - - -
RS Stock No. 829-3506
Mfr. Part No.103H5210-0440
€52.43
Each
units
1.8° 0.37Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 49.5mm - 3.3Ω -
RS Stock No. 829-3516
Mfr. Part No.103H7126-0740
€78.67
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. 892-9182
Mfr. Part No.P532 258 004.10
BrandPortescap
€262.03
Each
units
3.6° 0.36Nm 8 - 52 x 52mm Disc Magnet 5mm 2 A Parallel, Series 19.15mm 55mm 1 2.2Ω 28mNm
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. 878-7730
Mfr. Part No.SM2863-5151
€255.67
Each
units
1.8° 9.0Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 128.5mm - -
RS Stock No. 878-7705
Mfr. Part No.4837961-1
€5.62
Each
units
1.8° - 4 - - Bipolar, Unipolar - - Bipolar - - - - -
RS Stock No. 878-7720
Mfr. Part No.SM2862-5151
€257.47
Each
units
1.8° 6.4Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 98mm - 0.83Ω -
RS Stock No. 877-7219
Mfr. Part No.23HSX-206-CE
€227.39
Each
units
1.8° 0.75Nm 8 (Connector Pins) 70 V dc 23mm Hybrid 6.35mm 3 A Bipolar, Unipolar 19mm 56.6mm - 0.7Ω -
RS Stock No. 878-7702
Mfr. Part No.103H8222-6340
€257.47
Each
units
1.8° 5.1Nm 4 100 V ac 85.85 x 85.85mm Single Shaft 12mm 6 A Bipolar 28.48mm 93.73mm - 0.35Ω -
RS Stock No. 878-7676
Mfr. Part No.103H7823-0740
€110.72
Each
units
1.8° 2.1Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 3 A Unipolar 19.1mm 87.3mm - 1.25Ω -
RS Stock No. 829-3528
Mfr. Part No.4835710-1
€2.96
Each
units
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 829-3540
Mfr. Part No.SP2563-5160
€185.59
Each
units
1.8° 1.0Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 81.5mm - 1.5Ω -
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