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 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 892-9182
製造零件編號P532 258 004.10
BrandPortescap
HK$2,305.85
單位
3.6° 0.36Nm 8 - 52 x 52mm Disc Magnet 5mm 2 A Parallel, Series 19.15mm 55mm 1 2.2Ω 28mNm
RS庫存編號 892-9189
製造零件編號P530-258-012.10
BrandPortescap
HK$2,305.85
單位
3.6° 0.18Nm 8 - - Disc Magnet - 400 mA Bipolar - - 1 - 10mNm
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 892-9167
製造零件編號P310-158-005.10
BrandPortescap
HK$1,855.00
單位
14mNm 8 - - Disc Magnet - 720 mA Bipolar - - 1 - 2.5mNm
RS庫存編號 180-5280
BrandRS PRO
HK$330.84
單位
1.8° - 6 4 V 56.4 x 56.4mm Hybrid 6.35mm 1.1 A Unipolar 19mm 41mm - 3.6Ω -
RS庫存編號 136-6714
製造零件編號103H7123-1749
HK$499.13
單位
1.8° 1.10Nm - - 56 x 56mm - 6.35mm 4 A Bipolar 20.6mm 56mm - 0.4Ω -
RS庫存編號 191-8299
BrandRS PRO
HK$213.36
單位
1.8° 0.10Nm 6 12 V dc 40 x 40mm Hybrid 5mm 400 mA Unipolar 53mm 33mm - 30Ω -
RS庫存編號 892-9325
製造零件編號35M048B2B
BrandPortescap
HK$374.66
單位
7.5° 19.8mNm - - - Bipolar, Unipolar 2mm 170 mA - - 29.84mm - - -
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 180-5287
BrandRS PRO
HK$462.29
單位
1.8° - 6 5.7 V 56.4 x 56.4mm Hybrid 6.35mm 1 A Unipolar 19mm 76mm - 5.7Ω -
RS庫存編號 181-6695
製造零件編號EMMS-ST-87-M-SE-G2
BrandFesto
HK$4,430.48
單位
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 144.9mm - 0.23Ω -
RS庫存編號 181-6703
製造零件編號EMMS-ST-28-L-SEB
BrandFesto
HK$8,445.58
單位
1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 96mm - 2.3Ω -
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 181-6693
製造零件編號EMMS-ST-87-S-SEB-G2
BrandFesto
HK$7,262.91
單位
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 125.6mm - 0.1Ω -
RS庫存編號 351-4603
製造零件編號P542-M481U-G01L82
HK$580.69
單位
7.5° 0.20Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS庫存編號 136-6703
製造零件編號2H4248U12R220
HK$756.19
單位
1.8° 0.37Nm 6 36 V 42 x 42mm Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 3.3Ω -
RS庫存編號 136-6701
製造零件編號2H4233B05R220
HK$666.04
單位
1.8° 0.26Nm 4 36 V 42 x 42mm Bipolar 5mm 480 mA Bipolar 24mm 42mm - 14Ω -
RS庫存編號 918-0846
BrandRS PRO
HK$325.58
單位
15° 72mNm 4 24 V 59.8mm Permanent Magnet 3mm - Unipolar 7mm 60mm - 122Ω -
RS庫存編號 878-7758
製造零件編號103H5205-5210
HK$362.99
單位
1.8° 0.27Nm 6 24 V dc 42 x 42mm Bipolar, Unipolar 5mm 1 A Bipolar 22.5mm 34.5mm - 3.4Ω -