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. 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. 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. 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. 829-3522
Mfr. Part No.4835728-1
HK$23.31
Each
units
- - 4 - - Bipolar, Unipolar - - Unipolar - - - - -
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. 829-3503
Mfr. Part No.103H5208-5240
HK$351.84
Each
units
1.8° 0.39Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 40.5mm - 4.1Ω -
RS Stock No. 878-7657
Mfr. Part No.SH3533-12U40
HK$642.19
Each
units
1.8° 0.12Nm 6 24 V dc 35 x 35mm Single Shaft 5mm 1.2 A Unipolar 18mm 35mm - 2.4Ω -
RS Stock No. 878-7777
Mfr. Part No.103H7123-5640
HK$435.60
Each
units
1.8° 1.0Nm 4 24 V dc 56 x 56mm Single Shaft 6.35mm 1 A Bipolar 19.1mm 55.3mm - 5.7Ω -
RS Stock No. 829-3528
Mfr. Part No.4835710-1
HK$22.12
Each
units
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS Stock No. 829-3540
Mfr. Part No.SP2563-5160
HK$1,254.70
Each
units
1.8° 1.0Nm 4 24 V dc 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 81.5mm - 1.5Ω -
RS Stock No. 829-3531
Mfr. Part No.SH2141-5511
HK$757.03
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. 183-3584
Mfr. Part No.4835775-1
HK$51.42
Each
units
- - 4 - - - - - Bipolar - 500mm - - -
RS Stock No. 136-6716
Mfr. Part No.103H7126-1740
HK$602.66
Each
units
1.8° 1.65Nm - - 56 x 56mm - 6.35mm 4 A Bipolar 19 56 - 0.5Ω -
RS Stock No. 878-7768
Mfr. Part No.103H7123-0440
HK$430.39
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. 136-6703
Mfr. Part No.2H4248U12R220
HK$1,206.52
Each
units
1.8° 0.37Nm 6 36 V 42 x 42mm Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 3.3Ω -
RS Stock No. 878-7660
Mfr. Part No.SH3537-12U40
HK$438.08
Each
units
1.8° 0.15Nm 6 24 V dc 35 x 35mm Single Shaft 5mm 1.2 A Unipolar 18mm 39mm - 2.7Ω -
RS Stock No. 136-6712
Mfr. Part No.103H5205-4240
HK$300.78
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. 183-3583
Mfr. Part No.SF2424-10B41
HK$502.11
Each
units
1.8° 0.43Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 39mm - 4.6Ω -
RS Stock No. 136-6708
Mfr. Part No.2H5676B20S340
HK$2,047.07
Each
units
1.8° 1.27Nm 4 36 V dc 56 x 56mm Bipolar 6.35mm 2 A Bipolar 20.6mm 56mm - 1.05Ω -
RS Stock No. 136-6706
Mfr. Part No.2H4238B17S340
HK$1,497.52
Each
units
1.8° 0.39Nm 4 36 V dc 42 x 42mm Bipolar 5mm 1.7 A Bipolar 24mm 42mm - 1.3Ω -