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 829-3493
製造零件編號103H5208-0440
HK$384.04
單位
1.8° 0.30Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 40.5mm - 2.9Ω -
RS庫存編號 918-0849
BrandRS PRO
HK$130.19
單位
15° 10mNm 4 24 V 42mm Permanent Magnet 2mm - Unipolar 6.5mm 24.5mm - 500Ω -
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 878-7727
製造零件編號SM2861-5151
HK$1,104.57
單位
1.8° 3.30Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 67.5mm - 0.56Ω -
RS庫存編號 892-8726
BrandRS PRO
HK$658.28
單位
1.8° 30mNm 4 4.32 V 20.2 x 20.2mm Hybrid, Permanent Magnet 4mm 800 mA - 5mm 48.5mm 1 5.4Ω -
RS庫存編號 892-9328
製造零件編號42L048D2B
BrandPortescap
HK$461.15
單位
7.5° 0.13Nm - - - Bipolar, Unipolar 3mm 400 mA - - 33.38mm - - -
RS庫存編號 181-6692
製造零件編號EMMS-ST-87-S-SB-G2
BrandFesto
HK$5,546.00
單位
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 132.6mm - 0.1Ω -
RS庫存編號 181-6683
製造零件編號EMMS-ST-57-S-SE-G2
BrandFesto
HK$2,962.89
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 102.5mm - 0.15Ω -
RS庫存編號 892-9164
製造零件編號2011400034
BrandPortescap
HK$1,495.55
單位
3.6° 90mNm 8 - 39 x 39mm Disc Magnet 5mm 560 mA Series 20.5mm 49mm 1 10Ω 3.5mNm
RS庫存編號 878-7711
製造零件編號103H8223-6340
HK$1,914.38
單位
1.8° 7.44Nm 4 100 V ac 85.85 x 85.85mm Single Shaft 12mm 6 A Bipolar 28.48mm 127.42mm - 0.45Ω -
RS庫存編號 183-3580
製造零件編號SF2421-10B41
HK$347.84
單位
1.8° 0.29Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 48mm - 5.3Ω -
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 878-7742
製造零件編號SM2863-5251
HK$1,966.17
單位
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庫存編號 351-4625
製造零件編號P542-M481U-G11L82
HK$603.23
單位
7.5° 1.0Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS庫存編號 535-0423
BrandRS PRO
HK$680.22
單位
1.8° 1.0Nm 4 2.3 V 56.4 x 56.4mm Hybrid, Permanent Magnet 6.35mm 2.8 A - 19mm 51mm - 0.83Ω 35mNm
RS庫存編號 181-6687
製造零件編號EMMS-ST-57-M-SE-G2
BrandFesto
HK$3,167.05
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 124mm - 0.25Ω -
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 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 181-6684
製造零件編號EMMS-ST-57-S-SB-G2
BrandFesto
HK$4,524.27
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 123.5mm - 0.15Ω -
RS庫存編號 877-7222
製造零件編號STM17S-3AN
HK$2,912.03
單位
1.8° 0.48Nm 8 12 48 V dc 17mm Dual Hybridge 5mm 2 A - 22mm 81mm - - -