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. 181-6693
Mfr. Part No.EMMS-ST-87-S-SEB-G2
BrandFesto
$1,458.74
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 125.6mm - 0.1Ω -
RS Stock No. 918-0846
BrandRS PRO
$65.39
Each
units
15° 72mNm 4 24 V 59.8mm Permanent Magnet 3mm - Unipolar 7mm 60mm - 122Ω -
RS Stock No. 180-5294
BrandRS PRO
$384.70
Each
units
1.8° - 4 2.3 V 85.85 x 85.85mm Hybrid 12.7mm 5.5 A - 30.23mm 80mm - 0.42Ω -
RS Stock No. 180-5277
BrandRS PRO
$84.07
Each
units
1.8° - 6 4 V 42.3 x 42.3mm Hybrid 5mm 950 mA Unipolar 22mm 33mm - 4.2Ω -
RS Stock No. 878-7742
Mfr. Part No.SM2863-5251
$441.71
Each
units
1.8° 9.0Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 6 A Bipolar 28.5mm 128.5mm - 0.46Ω -
RS Stock No. 892-9154
Mfr. Part No.P010-064-003.02
BrandPortescap
$315.06
Each
units
15° 2.5mNm 4 - - Disc Magnet 1.5mm 370 mA Bipolar, Unparallel 2.9mm 26mm 1 0.04mNm
RS Stock No. 191-8299
BrandRS PRO
$89.87
Each
units
1.8° 0.10Nm 6 12 V dc 40 x 40mm Hybrid 5mm 400 mA Unipolar 53mm 33mm - 30Ω -
RS Stock No. 136-6716
Mfr. Part No.103H7126-1740
$127.19
Each
units
1.8° 1.65Nm - - 56 x 56mm - 6.35mm 4 A Bipolar 19mm 56mm - 0.5Ω -
RS Stock No. 878-7667
Mfr. Part No.103H7823-0440
$124.91
Each
units
1.8° 2.1Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 2 A Unipolar 19.1mm 87.3mm - 2.7Ω -
RS Stock No. 829-3499
Mfr. Part No.103H5205-5240
$70.60
Each
units
1.8° 0.27Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 34.5mm - 3.4Ω -
RS Stock No. 878-7727
Mfr. Part No.SM2861-5151
$263.94
Each
units
1.8° 3.30Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 67.5mm - 0.56Ω -
RS Stock No. 829-3519
Mfr. Part No.103H7123-0140
$112.82
Each
units
1.8° 0.83Nm 6 24 V dc 56 x 56mm Hybrid 6.35mm 1 A Unipolar 19.1mm 55.3mm - 6.7Ω -
RS Stock No. 829-3512
Mfr. Part No.103H7123-5740
$91.76
Each
units
1.8° 1.0Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 53.8mm - - -
RS Stock No. 136-6712
Mfr. Part No.103H5205-4240
$63.48
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. 181-6686
Mfr. Part No.EMMS-ST-57-M-S-G2
BrandFesto
$347.19
Each
units
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 95mm - 0.25Ω -
RS Stock No. 892-9316
Mfr. Part No.35L048D1B
BrandPortescap
$89.78
Each
units
7.5° 54mNm - - - Bipolar, Unipolar 2mm 450 mA - - 32.38mm - - -
RS Stock No. 136-6714
Mfr. Part No.103H7123-1749
$105.26
Each
units
1.8° 1.10Nm - - 56 x 56mm - 6.35mm 4 A Bipolar 20.6mm 56mm - 0.4Ω -
RS Stock No. 183-3580
Mfr. Part No.SF2421-10B41
$72.00
Each
units
1.8° 0.29Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 48mm - 5.3Ω -
RS Stock No. 892-9300
Mfr. Part No.26M048B2B
BrandPortescap
$70.72
Each
units
7.5° 10.6mNm - - - Permanent Magnet 2mm 110 mA - - 28.42mm - - -
RS Stock No. 180-5278
BrandRS PRO
$61.15
Each
units
1.8° - 6 9.6 V 42.3 x 42.3mm Hybrid 5mm 400 mA Unipolar 22mm 33mm - 24Ω -
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