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. 892-9299
Mfr. Part No.20M020D2B
BrandPortescap
€31.23
Each
units
18° 11mNm - - - Permanent Magnet 1.5mm 100 mA - - 24.88mm - - -
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. 892-9164
Mfr. Part No.2011400034
BrandPortescap
€169.95
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. 892-9154
Mfr. Part No.P010-064-003.02
BrandPortescap
€178.26
Each
units
15° 2.5mNm 4 - - Disc Magnet 1.5mm 370 mA Bipolar, Unparallel 2.9mm 26mm 1 0.04mNm
RS Stock No. 892-9167
Mfr. Part No.P310-158-005.10
BrandPortescap
€202.33
Each
units
14mNm 8 - - Disc Magnet - 720 mA Bipolar - - 1 - 2.5mNm
RS Stock No. 892-9296
Mfr. Part No.20M020D1B
BrandPortescap
€31.23
Each
units
18° 11mNm - - - Permanent Magnet 1.5mm 250 mA - - 24.88mm - - -
RS Stock No. 892-9316
Mfr. Part No.35L048D1B
BrandPortescap
€47.42
Each
units
7.5° 54mNm - - - Bipolar, Unipolar 2mm 450 mA - - 32.38mm - - -
RS Stock No. 892-9325
Mfr. Part No.35M048B2B
BrandPortescap
€42.58
Each
units
7.5° 19.8mNm - - - Bipolar, Unipolar 2mm 170 mA - - 29.84mm - - -
RS Stock No. 892-9158
Mfr. Part No.P110-064-015.12
BrandPortescap
€142.60
Each
units
15° 7mNm 4 - - Disc Magnet - 650 mA Bipolar - - 1 - 1mNm
RS Stock No. 892-9328
Mfr. Part No.42L048D2B
BrandPortescap
€52.40
Each
units
7.5° 0.13Nm - - - Bipolar, Unipolar 3mm 400 mA - - 33.38mm - - -
RS Stock No. 892-9186
Mfr. Part No.P532-258-0,7.10
BrandPortescap
€262.03
Each
units
3.6° 0.36Nm 8 - 52 x 52mm Disc Magnet 5mm 2.3 A Parallel 19.15mm 55mm 1 0.4Ω 28mNm
RS Stock No. 892-9173
Mfr. Part No.P520-254-0,7.60
BrandPortescap
€206.77
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. 235-7768
Mfr. Part No.P110-064-068.12
BrandPortescap
€147.51
Each
units
15° 7mNm - 12 V dc - Disc Magnet 1.5mm 120 mA Bipolar 4mm 19mm 1 62Ω -
RS Stock No. 892-9160
Mfr. Part No.P430-258-013.01
BrandPortescap
€169.95
Each
units
3.6° 90mNm 8 - 39 x 39mm Disc Magnet 5mm 1 A Parallel 20.5mm 49mm 1 6.5Ω 3.5mNm
RS Stock No. 892-9189
Mfr. Part No.P530-258-012.10
BrandPortescap
€262.03
Each
units
3.6° 0.18Nm 8 - - Disc Magnet - 400 mA Bipolar - - 1 - 10mNm
RS Stock No. 892-9176
Mfr. Part No.PP520-258-004.01
BrandPortescap
€271.95
Each
units
3.6° 0.21Nm 8 - 52 x 52mm Disc Magnet 5mm 900 mA Unipolar, Unparallel 19.15mm 45.6mm 1 4.4Ω 10mNm
RS Stock No. 892-9170
Mfr. Part No.P530-258-004.10
BrandPortescap
€181.86
Each
units
3.6° 0.18Nm 8 - - Disc Magnet - 700 mA Bipolar - - 1 - 10mNm
RS Stock No. 892-9300
Mfr. Part No.26M048B2B
BrandPortescap
€37.40
Each
units
7.5° 10.6mNm - - - Permanent Magnet 2mm 110 mA - - 28.42mm - - -
RS Stock No. 892-9306
Mfr. Part No.26M024D1B
BrandPortescap
€40.89
Each
units
15° 12mNm - - - Permanent Magnet 2mm 250 mA - - 28.42mm - - -