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 829-3506
製造零件編號103H5210-0440
HK$395.20
單位
1.8° 0.37Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 49.5mm - 3.3Ω -
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 181-6690
製造零件編號EMMS-ST-87-S-S-G2
BrandFesto
HK$2,542.08
單位
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 82.6mm - 0.1Ω -
RS庫存編號 892-9299
製造零件編號20M020D2B
BrandPortescap
HK$274.79
單位
18° 11mNm - - - Permanent Magnet 1.5mm 100 mA - - 24.88mm - - -
RS庫存編號 892-8748
BrandRS PRO
HK$1,155.44
單位
1.8° 1.5Nm 8 3.36 V, 4.8 V, 6.72 V 60 x 60mm Hybrid, Permanent Magnet 7.5mm 2 A Parallel, Series, Unipolar 22.4mm 89mm 1 2.4Ω -
RS庫存編號 878-7691
製造零件編號4837798-1
HK$58.34
單位
1.8° - 6 - - Bipolar, Unipolar - - Unipolar - - - - -
RS庫存編號 183-3584
製造零件編號4835775-1
HK$51.42
單位
- - 4 - - - - - Bipolar - 500mm - - -
RS庫存編號 180-5276
BrandRS PRO
HK$760.41
單位
1.8° - 6 6.5 V 39.2 x 39.2mm Hybrid 5mm 500 mA Unipolar 22mm 20mm - 13Ω -
RS庫存編號 892-9306
製造零件編號26M024D1B
BrandPortescap
HK$361.62
單位
15° 12mNm - - - Permanent Magnet 2mm 250 mA - - 28.42mm - - -
RS庫存編號 181-6689
製造零件編號EMMS-ST-57-M-SEB-G2
BrandFesto
HK$6,129.78
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 159.5mm - 0.25Ω -
RS庫存編號 535-0489
BrandRS PRO
HK$300.19
單位
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庫存編號 181-6688
製造零件編號EMMS-ST-57-M-SB-G2
BrandFesto
HK$4,706.30
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 145mm - 0.25Ω -
RS庫存編號 181-6687
製造零件編號EMMS-ST-57-M-SE-G2
BrandFesto
HK$3,152.06
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 124mm - 0.25Ω -
RS庫存編號 181-6686
製造零件編號EMMS-ST-57-M-S-G2
BrandFesto
HK$1,728.58
單位
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 95mm - 0.25Ω -