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. 440-262
Mfr. Part No.82910003
BrandCrouzet
TWD1,431.00
Each
units
7.5° 20mNm 6 12.7 V dc - Permanent Magnet 2mm 190 mA Unipolar 7.8mm 21.7mm 2 66Ω -
RS Stock No. 829-3547
Mfr. Part No.SS2422-5041
TWD1,266.00
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. 351-4647
Mfr. Part No.P542-M481U-G23L82
TWD2,461.00
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. 892-9167
Mfr. Part No.P310-158-005.10
BrandPortescap
TWD7,291.00
Each
units
14mNm 8 - - Disc Magnet - 720 mA Bipolar - - 1 - 2.5mNm
RS Stock No. 829-3538
Mfr. Part No.SS2421-5041
TWD1,150.00
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. 892-9170
Mfr. Part No.P530-258-004.10
BrandPortescap
TWD5,938.00
Each
units
3.6° 0.18Nm 8 - - Disc Magnet - 700 mA Bipolar - - 1 - 10mNm
RS Stock No. 383-1267
Mfr. Part No.53154
TWD513.00
Each
units
18° 50mNm 6 12 V dc - Bipolar, Unipolar 1.5mm - Unipolar - - 2 - -
RS Stock No. 829-3534
Mfr. Part No.SH2141-5541
TWD2,405.00
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. 829-3531
Mfr. Part No.SH2141-5511
TWD2,927.00
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. 878-7673
Mfr. Part No.103H7823-1740
TWD3,829.00
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. 892-9300
Mfr. Part No.26M048B2B
BrandPortescap
TWD1,294.00
Each
units
7.5° 10.6mNm - - - Permanent Magnet 2mm 110 mA - - 28.42mm - - -
RS Stock No. 441-0401
Mfr. Part No.16HS-012
TWD3,319.00
Each
units
1.8° 87mNm 4 12 V dc 39 x 39mm Hybrid 5mm 600 mA Bipolar 12mm - 1 6.6Ω -
RS Stock No. 535-0489
BrandRS PRO
TWD1,180.00
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. 829-3522
Mfr. Part No.4835728-1
TWD88.00
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 535-0372
BrandRS PRO
TWD1,395.00
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. 351-4603
Mfr. Part No.P542-M481U-G01L82
TWD2,282.00
Each
units
7.5° 0.20Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 829-3493
Mfr. Part No.103H5208-0440
TWD1,509.00
Each
units
1.8° 0.30Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 40.5mm - 2.9Ω -
RS Stock No. 535-0401
BrandRS PRO
TWD1,716.00
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. 921-1347
Mfr. Part No.AM0820-V3-18-08 C06.072A 08/1 256:1
BrandFaulhaber
TWD15,635.00
Each
units
18° 0.65mNm 4 3 V dc - Bipolar, Unipolar 2.34mm 150 mA Bipolar 3.85mm 16.75mm 2 18Ω 0.17mNm
RS Stock No. 122-4621
Mfr. Part No.ADM1220S-2R-V3-83 + M2X0.2X15 + 2.8000.08.353
BrandFaulhaber
TWD17,271.00
Each
units
18° 2.4mNm - 3 V - Disc Magnet 1.5mm 220 mA Bipolar 3.85mm 0mm 10 10.4Ω -