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 Stock No. 183-3583
Mfr. Part No.SF2424-10B41
PHP3,078.00
Each
units
1.8° 0.8Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 39mm - 4.6Ω -
RS Stock No. 878-7730
Mfr. Part No.SM2863-5151
PHP12,304.41
Each
units
1.8° 9.0Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 128.5mm - -
RS Stock No. 440-307
Mfr. Part No.82940003
BrandCrouzet
PHP2,844.66
Each
units
7.5° 0.24Nm 6 12.7 V dc - Permanent Magnet 6mm 50 mA Unipolar 13mm 43mm 2 26.7Ω -
RS Stock No. 829-3500
Mfr. Part No.103H5210-5240
PHP2,793.13
Each
units
1.8° 0.51Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 22.5mm 49.5mm - 4.8Ω -
RS Stock No. 440-290
Mfr. Part No.82930015
BrandCrouzet
PHP1,981.42
Each
units
7.5° 0.16Nm 6 12.5 V - Permanent Magnet 4mm 390 mA Unipolar 14.4mm 35.4mm 2 32Ω -
RS Stock No. 351-4647
Mfr. Part No.P542-M481U-G23L82
PHP4,059.68
Each
units
7.5° 1.0Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
RS Stock No. 181-6679
Mfr. Part No.EMMS-ST-42-S-SE-G2
BrandFesto
PHP18,180.26
Each
units
1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 94mm - 1.75Ω -
RS Stock No. 181-6687
Mfr. Part No.EMMS-ST-57-M-SE-G2
BrandFesto
PHP20,441.57
Each
units
1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 124mm - 0.25Ω -
RS Stock No. 181-6691
Mfr. Part No.EMMS-ST-87-S-SE-G2
BrandFesto
PHP27,790.83
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 112.6mm - 0.1Ω -
RS Stock No. 181-6690
Mfr. Part No.EMMS-ST-87-S-S-G2
BrandFesto
PHP16,485.76
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 82.6mm - 0.1Ω -
RS Stock No. 829-3519
Mfr. Part No.103H7123-0140
PHP3,642.73
Each
units
1.8° 0.83Nm 6 24 V dc 56 x 56mm Hybrid 6.35mm 1 A Unipolar 19.1mm 55.3mm - 6.7Ω -
RS Stock No. 181-6681
Mfr. Part No.EMMS-ST-42-S-SEB-G2
BrandFesto
PHP37,492.66
Each
units
1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 127mm - 1.75Ω -
RS Stock No. 181-6692
Mfr. Part No.EMMS-ST-87-S-SB-G2
BrandFesto
PHP35,796.68
Each
units
1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 132.6mm - 0.1Ω -
RS Stock No. 892-9176
Mfr. Part No.PP520-258-004.01
BrandPortescap
PHP15,871.18
Each
units
3.6° 0.21Nm 8 - 52 x 52mm Disc Magnet 5mm 900 mA Unipolar, Unparallel 19.15mm 45.6mm 1 4.4Ω 10mNm
RS Stock No. 878-7720
Mfr. Part No.SM2862-5151
PHP14,693.33
Each
units
1.8° 6.4Nm 4 100 V ac 85.5 x 85.5mm Single Shaft 14mm 4 A Bipolar 28.5mm 98mm - 0.83Ω -
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