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 892-9158
製造零件編號P110-064-015.12
BrandPortescap
HK$1,071.95
單位
15° 7mNm 4 - - Disc Magnet - 650 mA Bipolar - - 1 - 1mNm
RS庫存編號 892-9300
製造零件編號26M048B2B
BrandPortescap
HK$330.50
單位
7.5° 10.6mNm - - - Permanent Magnet 2mm 110 mA - - 28.42mm - - -
RS庫存編號 892-9160
製造零件編號P430-258-013.01
BrandPortescap
HK$1,277.55
單位
3.6° 90mNm 8 - 39 x 39mm Disc Magnet 5mm 1 A Parallel 20.5mm 49mm 1 6.5Ω 3.5mNm
RS庫存編號 892-9176
製造零件編號PP520-258-004.01
BrandPortescap
HK$2,405.00
單位
3.6° 0.21Nm 8 - 52 x 52mm Disc Magnet 5mm 900 mA Unipolar, Unparallel 19.15mm 45.6mm 1 4.4Ω 10mNm
RS庫存編號 892-9164
製造零件編號2011400034
BrandPortescap
HK$1,418.17
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 892-9182
製造零件編號P532 258 004.10
BrandPortescap
HK$2,317.50
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 892-9296
製造零件編號20M020D1B
BrandPortescap
HK$276.12
單位
18° 11mNm - - - Permanent Magnet 1.5mm 250 mA - - 24.88mm - - -
RS庫存編號 892-9154
製造零件編號P010-064-003.02
BrandPortescap
HK$1,560.50
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 892-9189
製造零件編號P530-258-012.10
BrandPortescap
HK$2,293.73
單位
3.6° 0.18Nm 8 - - Disc Magnet - 400 mA Bipolar - - 1 - 10mNm
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 892-9167
製造零件編號P310-158-005.10
BrandPortescap
HK$1,733.75
單位
14mNm 8 - - Disc Magnet - 720 mA Bipolar - - 1 - 2.5mNm
RS庫存編號 892-9186
製造零件編號P532-258-0,7.10
BrandPortescap
HK$2,441.93
單位
3.6° 0.36Nm 8 - 52 x 52mm Disc Magnet 5mm 2.3 A Parallel 19.15mm 55mm 1 0.4Ω 28mNm
RS庫存編號 892-9325
製造零件編號35M048B2B
BrandPortescap
HK$376.38
單位
7.5° 19.8mNm - - - Bipolar, Unipolar 2mm 170 mA - - 29.84mm - - -
RS庫存編號 235-7768
製造零件編號P110-064-068.12
BrandPortescap
HK$1,263.94
單位
15° 7mNm - 12 V dc - Disc Magnet 1.5mm 120 mA Bipolar 4mm 19mm 1 62Ω -
RS庫存編號 892-9170
製造零件編號P530-258-004.10
BrandPortescap
HK$1,549.29
單位
3.6° 0.18Nm 8 - - Disc Magnet - 700 mA Bipolar - - 1 - 10mNm
RS庫存編號 892-9173
製造零件編號P520-254-0,7.60
BrandPortescap
HK$1,864.07
單位
3.6° 0.21Nm 8 - 52 x 52mm Disc Magnet 5mm 2.3 A Bipolar, Unparallel 19.15mm 45.6mm 1 0.7Ω 10mNm
RS庫存編號 892-9328
製造零件編號42L048D2B
BrandPortescap
HK$463.38
單位
7.5° 0.13Nm - - - Bipolar, Unipolar 3mm 400 mA - - 33.38mm - - -
RS庫存編號 892-9316
製造零件編號35L048D1B
BrandPortescap
HK$356.58
單位
7.5° 54mNm - - - Bipolar, Unipolar 2mm 450 mA - - 32.38mm - - -
RS庫存編號 892-9299
製造零件編號20M020D2B
BrandPortescap
HK$234.70
單位
18° 11mNm - - - Permanent Magnet 1.5mm 100 mA - - 24.88mm - - -