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. 340-3761
Mfr. Part No.34HSX-312
$704.41
Each
units
1.8° 6.2Nm 8 120 V dc 86 x 86mm Permanent Magnet 9.53mm 6.4 A Unipolar 28.6mm - 2 0.50Ω -
RS Stock No. 878-7768
Mfr. Part No.103H7123-0440
$98.71
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. 351-4580
Mfr. Part No.42M048C-1U
$50.46
Each
units
7.5° 66mNm 6 5 V dc - Permanent Magnet 3mm 550 mA Unipolar 9.88mm 22mm 2 9.1Ω -
RS Stock No. 191-8340
BrandRS PRO
$74.24
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. 535-0467
BrandRS PRO
$49.37
Each
units
1.8° 0.22Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.33 A - 22mm 33mm - 2.1Ω -
RS Stock No. 878-7755
Mfr. Part No.103H5205-0410
$72.90
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. 535-0445
BrandRS PRO
$157.38
Each
units
1.8° 1.89Nm 4 3.2 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A - 19mm 76mm - 1.13Ω 72mNm
RS Stock No. 191-8306
BrandRS PRO
$53.29
Each
units
1.8° 98mNm 6 15 V dc 40 x 40mm Hybrid 5mm 320 mA Unipolar 24mm 33mm 2 37.5Ω -
RS Stock No. 351-4631
Mfr. Part No.P542-M481U-G17L82
$124.21
Each
units
7.5° 1.0Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 829-3528
Mfr. Part No.4835710-1
$5.14
Each
units
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 535-0338
BrandRS PRO
$93.22
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. 235-7768
Mfr. Part No.P110-064-068.12
BrandPortescap
$356.73
Each
units
15° 7mNm - 12 V dc - Disc Magnet 1.5mm 120 mA Bipolar 4mm 19mm 1 62Ω -
RS Stock No. 455-2549
Mfr. Part No.53467
$44.11
Each
units
7.5° 3mNm - 12 V dc 36mm Bipolar, Unipolar - - Unipolar - - 2 - -
RS Stock No. 535-0489
BrandRS PRO
$124.93
Each
units
1.8° 0.44Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.68 A - 22mm 47mm - 1.65Ω -
RS Stock No. 892-9182
Mfr. Part No.P532 258 004.10
BrandPortescap
$463.13
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. 535-0366
BrandRS PRO
$158.97
Each
units
1.8° 0.12Nm 4 6.2 V 28 x 28mm Hybrid, Permanent Magnet 5mm 670 mA - 18mm 51mm - 9.2Ω -
RS Stock No. 829-3547
Mfr. Part No.SS2422-5041
$97.52
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. 878-7752
Mfr. Part No.103H5208-0410
$79.31
Each
units
1.8° 0.30Nm 6 24 V dc 42 x 42mm Bipolar, Unipolar 5mm 1.2 A Unipolar 22.5mm 40.5mm - 2.9Ω -
RS Stock No. 351-4647
Mfr. Part No.P542-M481U-G23L82
$128.90
Each
units
7.5° 1.0Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 892-8726
BrandRS PRO
$131.59
Each
units
1.8° 30mNm 4 4.32 V 20.2 x 20.2mm Hybrid, Permanent Magnet 4mm 800 mA - 5mm 48.5mm 1 5.4Ω -
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