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庫存編號 829-3544
製造零件編號SP2566-5160
HK$1,052.10
單位
1.8° 1.7Nm 4 24 V ac 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 103.5mm - -
RS庫存編號 180-5282
BrandRS PRO
HK$344.48
單位
1.8° - 6 6 V 56.4 x 56.4mm Hybrid 6.35mm 850 mA Unipolar 19mm 51mm - 7.1Ω -
RS庫存編號 368-0283
製造零件編號26M048B-2U
HK$308.77
單位
7.5° 9.0mNm 6 12 V dc - Permanent Magnet 2mm 100 mA Unipolar 9.78mm 13.72mm 2 110Ω -
RS庫存編號 191-8328
BrandRS PRO
HK$256.37
單位
1.8° 0.26Nm 8 5 V dc 56.4 x 56.4mm Hybrid 6.35mm 1 A - 79.1mm 38.5mm - -
RS庫存編號 878-7705
製造零件編號4837961-1
HK$49.54
單位
1.8° - 4 - - Bipolar, Unipolar - - Bipolar - - - - -
RS庫存編號 440-290
製造零件編號82930015
BrandCrouzet
HK$405.86
單位
7.5° 0.16Nm 6 12.5 V - Permanent Magnet 4mm 390 mA Unipolar 14.4mm 35.4mm 2 32Ω -
RS庫存編號 136-6706
製造零件編號2H4238B17S340
HK$938.76
單位
1.8° 0.39Nm 4 36 V dc 42 x 42mm Bipolar 5mm 1.7 A Bipolar 24mm 42mm - 1.3Ω -
RS庫存編號 183-3583
製造零件編號SF2424-10B41
HK$507.39
單位
1.8° 0.8Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 39mm - 4.6Ω -
RS庫存編號 829-3500
製造零件編號103H5210-5240
HK$254.09
單位
1.8° 0.51Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 49.5mm - 4.8Ω -
RS庫存編號 892-9154
製造零件編號P010-064-003.02
BrandPortescap
HK$1,568.65
單位
15° 2.5mNm 4 - - Disc Magnet 1.5mm 370 mA Bipolar, Unparallel 2.9mm 26mm 1 0.04mNm
RS庫存編號 180-5279
BrandRS PRO
HK$258.16
單位
1.8° - 6 12 V 42.3 x 42.3mm Hybrid 5mm 310 mA Unipolar 22mm 33mm - 38.5Ω -
RS庫存編號 181-6694
製造零件編號EMMS-ST-87-M-S-G2
BrandFesto
HK$2,700.24
單位
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 114.9mm - 0.23Ω -
RS庫存編號 892-8735
BrandRS PRO
HK$713.28
單位
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庫存編號 878-7676
製造零件編號103H7823-0740
HK$974.34
單位
1.8° 2.1Nm 6 24 V dc 60 x 60mm Single Shaft 8mm 3 A Unipolar 19.1mm 87.3mm - 1.25Ω -
RS庫存編號 183-3584
製造零件編號4835775-1
HK$51.96
單位
- - 4 - - - - - Bipolar - 500mm - - -
RS庫存編號 440-284
製造零件編號82920012
BrandCrouzet
HK$373.43
單位
7.5° 57mNm 6 12.9 V - Permanent Magnet 2mm 280 mA Unipolar 7.4mm 25.6mm 2 46Ω -
RS庫存編號 535-0366
BrandRS PRO
HK$791.53
單位
1.8° 0.12Nm 4 6.2 V 28 x 28mm Hybrid, Permanent Magnet 5mm 670 mA - 18mm 51mm - 9.2Ω -
RS庫存編號 181-6678
製造零件編號EMMS-ST-42-S-S-G2
BrandFesto
HK$1,430.35
單位
1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 66mm - 1.75Ω -
RS庫存編號 440-470
BrandRS PRO
HK$1,035.41
單位
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庫存編號 829-3496
製造零件編號103H5205-0440
HK$295.88
單位
1.8° 0.20Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 34.5mm - 2.24Ω -