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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Beskrivning Pris 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
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VarumärkeSanyo Denki
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1.8° 0.30Nm 6 24 V dc 42 x 42mm Hybrid 5mm 1.2 A Unipolar 22.5mm 40.5mm - 2.9Ω -
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1.8° 1.7Nm 4 24 V ac 56 x 56mm Hybrid 6.35mm 2 A Bipolar 19.1mm 103.5mm - -
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3.6° 90mNm 8 - 39 x 39mm Disc Magnet 5mm 560 mA Series 20.5mm 49mm 1 10Ω 3.5mNm
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1.8° 0.39Nm 4 36 V dc 42 x 42mm Bipolar 5mm 1.7 A Bipolar 24mm 42mm - 1.3Ω -
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1.8° 5.1Nm 4 100 V ac 85.85 x 85.85mm Single Shaft 12mm 6 A Bipolar 28.48mm 93.73mm - 0.35Ω -
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Tillv. art.nr26M048B-1U
244,09 kr
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7.5° 9.0mNm 6 5 V dc - Permanent Magnet 2mm 250 mA Unipolar 9.78mm 13.72mm 2 19.6Ω -
RS-artikelnummer 183-3581
Tillv. art.nrSF2422-10B41
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1.8° 0.43Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 33mm - 3.6Ω -
RS-artikelnummer 181-6679
Tillv. art.nrEMMS-ST-42-S-SE-G2
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1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 94mm - 1.75Ω -
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1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 70mm - 2.3Ω -
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Tillv. art.nr26M048B-2U
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7.5° 9.0mNm 6 12 V dc - Permanent Magnet 2mm 100 mA Unipolar 9.78mm 13.72mm 2 110Ω -
RS-artikelnummer 181-6686
Tillv. art.nrEMMS-ST-57-M-S-G2
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1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 95mm - 0.25Ω -
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Tillv. art.nrSF2423-10B41
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1.8° 0.56Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 59.5mm - 6.5Ω -
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Tillv. art.nrEMMS-ST-87-L-SE-G2
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1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 174.9mm - 0.23Ω -
RS-artikelnummer 136-6712
Tillv. art.nr103H5205-4240
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1.8° 0.27Nm 6 24 V dc 42 x 42mm Bipolar, Hybrid 5mm 1 A Bipolar 24mm 42mm - 3.4Ω -
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3.6° 0.36Nm 8 - 52 x 52mm Disc Magnet 5mm 2 A Parallel, Series 19.15mm 55mm 1 2.2Ω 28mNm
RS-artikelnummer 181-6687
Tillv. art.nrEMMS-ST-57-M-SE-G2
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1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 124mm - 0.25Ω -
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7.5° 0.54Nm 6 5 V dc - Permanent Magnet 4mm 550 mA Unipolar 17.2mm 25mm 2 9.1Ω -
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1.8° 0.37Nm 6 36 V 42 x 42mm Unipolar 5mm 1.2 A Unipolar 24mm 42mm - 3.3Ω -
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3.6° 0.18Nm 8 - - Disc Magnet - 400 mA Bipolar - - 1 - 10mNm
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