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
TWD6,883.00
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. 455-2549
Mfr. Part No.53467
TWD644.00
Each
units
7.5° 3mNm - 12 V dc 36mm Bipolar, Unipolar - - Unipolar - - 2 - -
RS Stock No. 183-3581
Mfr. Part No.SF2422-10B41
TWD858.00
Each
units
1.8° 0.43Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 33mm - 3.6Ω -
RS Stock No. 181-6689
Mfr. Part No.EMMS-ST-57-M-SEB-G2
BrandFesto
TWD24,094.00
Each
units
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 159.5mm - 0.25Ω -
RS Stock No. 180-5276
BrandRS PRO
TWD2,406.00
Each
units
1.8° - 6 6.5 V 39.2 x 39.2mm Hybrid 5mm 500 mA Unipolar 22mm 20mm - 13Ω -
RS Stock No. 191-8299
BrandRS PRO
TWD861.00
Each
units
1.8° 0.10Nm 6 12 V dc 40 x 40mm Hybrid 5mm 400 mA Unipolar 53mm 33mm - 30Ω -
RS Stock No. 235-7768
Mfr. Part No.P110-064-068.12
BrandPortescap
TWD5,103.00
Each
units
15° 7mNm - 12 V dc - Disc Magnet 1.5mm 120 mA Bipolar 4mm 19mm 1 62Ω -
RS Stock No. 892-9173
Mfr. Part No.P520-254-0,7.60
BrandPortescap
TWD7,153.00
Each
units
3.6° 0.21Nm 8 - 52 x 52mm Disc Magnet 5mm 2.3 A Bipolar, Unparallel 19.15mm 45.6mm 1 0.7Ω 10mNm
RS Stock No. 136-6712
Mfr. Part No.103H5205-4240
TWD1,183.00
Each
units
1.8° 0.27Nm 6 24 V dc 42 x 42mm Bipolar, Hybrid 5mm 1 A Bipolar 24mm 42mm - 3.4Ω -
RS Stock No. 440-420
BrandRS PRO
TWD801.00
Each
units
1.8° 70mNm 6 5 V dc 40 x 40mm Hybrid 5mm 500 mA Unipolar 73mm 33mm - 10Ω -
RS Stock No. 181-6699
Mfr. Part No.EMMS-ST-87-L-SE-G2
BrandFesto
TWD18,270.00
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 174.9mm - 0.23Ω -
RS Stock No. 918-0846
BrandRS PRO
TWD1,280.00
Each
units
15° 72mNm 4 24 V 59.8mm Permanent Magnet 3mm - Unipolar 7mm 60mm - 122Ω -
RS Stock No. 892-9164
Mfr. Part No.2011400034
BrandPortescap
TWD5,879.00
Each
units
3.6° 90mNm 8 - 39 x 39mm Disc Magnet 5mm 560 mA Series 20.5mm 49mm 1 10Ω 3.5mNm
RS Stock No. 892-9182
Mfr. Part No.P532 258 004.10
BrandPortescap
TWD9,063.00
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. 136-6713
Mfr. Part No.103H5208-0483
TWD1,282.00
Each
units
1.8° 0.30Nm 6 24 V dc 42 x 42mm Hybrid, Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 2.9Ω -
RS Stock No. 440-464
BrandRS PRO
TWD3,185.00
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. 829-3525
Mfr. Part No.103H7126-5740
TWD1,525.00
Each
units
1.8° 1.6Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 77.3mm - -
RS Stock No. 183-3584
Mfr. Part No.4835775-1
TWD104.00
Each
units
- - 4 - - - - - Bipolar - 500mm - - -
RS Stock No. 892-9316
Mfr. Part No.35L048D1B
BrandPortescap
TWD1,640.00
Each
units
7.5° 54mNm - - - Bipolar, Unipolar 2mm 450 mA - - 32.38mm - - -
RS Stock No. 892-9325
Mfr. Part No.35M048B2B
BrandPortescap
TWD1,473.00
Each
units
7.5° 19.8mNm - - - Bipolar, Unipolar 2mm 170 mA - - 29.84mm - - -