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. 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. 779-3740
Mfr. Part No.FMJ7301CH
TWD588.00
Each
units
5.625 °, 11.25 ° 40mNm 5 12 V - Bipolar, Unipolar 3mm 32 mA Unipolar 6mm 19mm - - -
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. 829-3544
Mfr. Part No.SP2566-5160
TWD4,090.00
Each
units
1.8° 1.7Nm 4 24 V ac 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 103.5mm - -
RS Stock No. 878-7768
Mfr. Part No.103H7123-0440
TWD1,662.00
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. 535-0445
BrandRS PRO
TWD3,005.00
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. 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. 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. 892-8754
BrandRS PRO
TWD4,192.00
Each
units
1.8° 98mNm 4 1.85 V 40 x 34.05mm Hybrid 3mm 500 mA - 10mm 19.4mm 1 3.7Ω -
RS Stock No. 340-3727
Mfr. Part No.23HSX-206
TWD3,540.00
Each
units
1.8° 0.75Nm 8 70 V dc 57.2 x 57.2mm Hybrid, Permanent Magnet 6.35mm 3 A Unipolar 19mm - 2 0.72Ω -
RS Stock No. 183-3582
Mfr. Part No.SF2423-10B41
TWD1,012.00
Each
units
1.8° 0.56Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 59.5mm - 6.5Ω -
RS Stock No. 535-0467
BrandRS PRO
TWD967.00
Each
units
1.8° 0.22Nm 4 2.8 V 42.3 x 42.3mm Hybrid, Permanent Magnet 5mm 1.33 A - 22mm 33mm - 2.1Ω -
RS Stock No. 878-7752
Mfr. Part No.103H5208-0410
TWD1,514.00
Each
units
1.8° 0.30Nm 6 24 V dc 42 x 42mm Bipolar, Unipolar 5mm 1.2 A Unipolar 22.5mm 40.5mm - 2.9Ω -
RS Stock No. 181-6690
Mfr. Part No.EMMS-ST-87-S-S-G2
BrandFesto
TWD9,992.00
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 82.6mm - 0.1Ω -
RS Stock No. 191-8306
BrandRS PRO
TWD947.00
Each
units
1.8° 98mNm 6 15 V dc 40 x 40mm Hybrid 5mm 320 mA Unipolar 24mm 33mm 2 37.5Ω -
RS Stock No. 878-7702
Mfr. Part No.103H8222-6340
TWD5,535.00
Each
units
1.8° 5.1Nm 4 100 V ac 85.85 x 85.85mm Single Shaft 12mm 6 A Bipolar 28.48mm 93.73mm - 0.35Ω -
RS Stock No. 180-5277
BrandRS PRO
TWD1,273.00
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
TWD7,644.00
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. 351-4619
Mfr. Part No.P542-M481U-G06L82
TWD2,371.00
Each
units
7.5° 0.54Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -