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. 535-0445
BrandRS PRO
PHP5,199.07
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. 829-3522
Mfr. Part No.4835728-1
PHP171.50
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 829-3525
Mfr. Part No.103H7126-5740
PHP3,004.50
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. 878-7673
Mfr. Part No.103H7823-1740
PHP6,627.83
Each
units
1.8° 2.7Nm 4 24 V dc 60 x 60mm Single Shaft 8mm 4 A Bipolar 19.1mm 87.3mm - 2.4Ω -
RS Stock No. 535-0502
BrandRS PRO
PHP4,269.14
Each
units
0.9° 1.26Nm 4 2.5 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A Unipolar 19mm 56mm - 0.9Ω -
RS Stock No. 440-442
BrandRS PRO
PHP1,981.27
Each
units
1.8° 0.50Nm 8 5.1 V dc 56.4 x 56.4mm Hybrid 6.35mm 1 A Unipolar 91.1mm 50.5mm - -
RS Stock No. 829-3528
Mfr. Part No.4835710-1
PHP171.50
Each
units
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 878-7685
Mfr. Part No.103H7823-5740
PHP6,627.83
Each
units
1.8° 2.7Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 2 A Bipolar 19.1mm 87.3mm - 9.5Ω -
RS Stock No. 535-0489
BrandRS PRO
PHP2,041.97
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. 455-2549
Mfr. Part No.53467
PHP1,114.37
Each
units
7.5° 3mNm - 12 V dc 36mm Bipolar, Unipolar - - Unipolar - - 2 - -
RS Stock No. 892-8735
BrandRS PRO
PHP4,625.75
Each
units
1.8° 0.78Nm 8 2.1 V, 3 V, 4.2 V 60 x 60mm Hybrid, Permanent Magnet 7.5mm 2 A Parallel, Series, Unipolar 22.4mm 69mm 1 1.5Ω -
RS Stock No. 383-1267
Mfr. Part No.53154
PHP887.91
Each
units
18° 50mNm 6 12 V dc - Bipolar, Unipolar 1.5mm - Unipolar - - 2 - -
RS Stock No. 829-3496
Mfr. Part No.103H5205-0440
PHP2,134.30
Each
units
1.8° 0.20Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 34.5mm - 2.24Ω -
RS Stock No. 878-7742
Mfr. Part No.SM2863-5251
PHP16,907.50
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. 878-7705
Mfr. Part No.4837961-1
PHP336.96
Each
units
1.8° - 4 - - Bipolar, Unipolar - - Bipolar - - - - -
RS Stock No. 191-8299
BrandRS PRO
PHP1,489.45
Each
units
1.8° 0.10Nm 6 12 V dc 40 x 40mm Hybrid 5mm 400 mA Unipolar 53mm 33mm - 30Ω -
RS Stock No. 878-7768
Mfr. Part No.103H7123-0440
PHP3,927.92
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. 440-470
BrandRS PRO
PHP7,009.92
Each
units
1.8° 2.2Nm 8 2.5 V dc 82.6 x 82.6mm Hybrid 9.5mm 4.5 A - 152.9mm 94mm - 0.56Ω -
RS Stock No. 829-3499
Mfr. Part No.103H5205-5240
PHP1,571.10
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. 368-0283
Mfr. Part No.26M048B-2U
PHP2,100.33
Each
units
7.5° 9.0mNm 6 12 V dc - Permanent Magnet 2mm 100 mA Unipolar 9.78mm 13.72mm 2 110Ω -
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