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. 440-420
BrandRS PRO
HK$220.48
Each
units
1.8° 70mNm 6 5 V dc 40 x 40mm Hybrid 5mm 500 mA Unipolar 73mm 33mm - 10Ω -
RS Stock No. 535-0401
BrandRS PRO
HK$258.00
Each
units
0.9° 0.44Nm 4 2.8 V 42.3 x 42.3mm Hybrid 5mm 1.68 A - 24mm 47mm - 1.65Ω -
RS Stock No. 779-3740
Mfr. Part No.FMJ7301CH
HK$135.21
Each
units
5.625 °, 11.25 ° 40mNm 5 12 V - Bipolar, Unipolar 3mm 32 mA Unipolar 6mm 19mm - - -
RS Stock No. 829-3538
Mfr. Part No.SS2421-5041
HK$346.69
Each
units
1.8° 83mNm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 7mm 11.6mm - 3.5Ω -
RS Stock No. 535-0445
BrandRS PRO
HK$497.99
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. 383-1267
Mfr. Part No.53154
HK$120.00
Each
units
18° 50mNm 6 12 V dc - Bipolar, Unipolar 1.5mm - Unipolar - - 2 - -
RS Stock No. 829-3547
Mfr. Part No.SS2422-5041
HK$413.86
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. 432-8289
Mfr. Part No.23HS-104 MK2
HK$597.43
Each
units
1.8° 0.52Nm 8 - 57.2 x 57.2mm Hybrid 6.35mm 2 A Unipolar 19mm - 2 1.1Ω -
RS Stock No. 535-0372
BrandRS PRO
HK$233.39
Each
units
0.9° 2.2mNm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.33 A - 22mm 33mm - 2.1Ω -
RS Stock No. 368-0277
Mfr. Part No.26M048B-1U
HK$211.09
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. 829-3525
Mfr. Part No.103H7126-5740
HK$529.24
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. 829-3534
Mfr. Part No.SH2141-5541
HK$758.68
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. 368-0261
Mfr. Part No.15M020D-1B
HK$182.12
Each
units
18° 3.9mNm 4 5 V - Permanent Magnet 1.5mm 125 mA Bipolar 8.5mm 15.11mm 2 40Ω -
RS Stock No. 351-4580
Mfr. Part No.42M048C-1U
HK$204.30
Each
units
7.5° 66mNm 6 5 V dc - Permanent Magnet 3mm 550 mA Unipolar 9.88mm 22mm 2 9.1Ω -
RS Stock No. 351-4619
Mfr. Part No.P542-M481U-G06L82
HK$459.41
Each
units
7.5° 0.54Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 829-3522
Mfr. Part No.4835728-1
HK$23.31
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 351-4574
Mfr. Part No.M82201-P2SB
HK$275.59
Each
units
7.5° 25mNm - 12 V dc - Permanent Magnet 2mm 180 mA Unipolar - - 2 - -
RS Stock No. 892-8732
BrandRS PRO
HK$214.56
Each
units
1.8° 0.36Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.68 A - 22mm 62mm 1 1.65Ω -
RS Stock No. 535-0344
BrandRS PRO
HK$325.52
Each
units
1.8° 60mNm 4 3.8 V 28 x 28mm Hybrid, Permanent Magnet 5mm 670 mA - 18mm 32mm - 5.6Ω -
RS Stock No. 892-9158
Mfr. Part No.P110-064-015.12
BrandPortescap
HK$1,071.95
Each
units
15° 7mNm 4 - - Disc Magnet - 650 mA Bipolar - - 1 - 1mNm
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