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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Part Details Brand Stock 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 Series Output Speed Detent Torque Standards Met
Sanyo Denki Bipolar Hybrid Stepper Motor 1.8°, 0.29Nm, 24 V dc, 1 A, 4 Wires Sanyo Denki 15 1.8° 0.29Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 33mm - 3.6Ω SF242 - - -
Sanyo Denki Bipolar Hybrid Stepper Motor 1.8°, 0.56Nm, 24 V dc, 1 A, 4 Wires Sanyo Denki 10 1.8° 0.56Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 48mm - 5.3Ω SF242 - - -
Sanyo Denki Bipolar Hybrid Stepper Motor 1.8°, 0.80Nm, 24 V dc, 1 A, 4 Wires Sanyo Denki 3 1.8° 0.80Nm 4 24 V dc 42 x 42mm Hybrid 5mm 1 A Bipolar 24mm 59.5mm - 6.5Ω SF242 - - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.4 A
  • RS Stock No. 181-6702
  • Brand Festo
  • Mfr. Part No. EMMS-ST-28-L-SE
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 70mm - 2.3Ω EMMS-ST 6000 rpm - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.4 A
  • RS Stock No. 181-6704
  • Brand Festo
  • Mfr. Part No. EMMS-ST-28-L-SB
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 96mm - 2.3Ω EMMS-ST 6000 rpm - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.4 A
  • RS Stock No. 181-6703
  • Brand Festo
  • Mfr. Part No. EMMS-ST-28-L-SEB
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 96mm - 2.3Ω EMMS-ST 6000 rpm - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.4 A Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.4 A - 20mm 70mm - 2.3Ω EMMS-ST 6000 rpm - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.8 A
  • RS Stock No. 181-6679
  • Brand Festo
  • Mfr. Part No. EMMS-ST-42-S-SE-G2
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 94mm - 1.75Ω EMMS-ST 1740 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.8 A
  • RS Stock No. 181-6680
  • Brand Festo
  • Mfr. Part No. EMMS-ST-42-S-SB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 114mm - 1.75Ω EMMS-ST 1740 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.8 A
  • RS Stock No. 181-6681
  • Brand Festo
  • Mfr. Part No. EMMS-ST-42-S-SEB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 127mm - 1.75Ω EMMS-ST 1740 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 1.8 A
  • RS Stock No. 181-6678
  • Brand Festo
  • Mfr. Part No. EMMS-ST-42-S-S-G2
Festo 0 1.8° - - 48 V dc - Hybrid 5mm 1.8 A - 24mm 66mm - 1.75Ω EMMS-ST 1740 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6689
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-M-SEB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 159.5mm - 0.25Ω EMMS-ST 1940 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6682
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-S-S-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 73.5mm - 0.15Ω EMMS-ST 2720 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6688
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-M-SB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 145mm - 0.25Ω EMMS-ST 1940 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6684
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-S-SB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 123.5mm - 0.15Ω EMMS-ST 2720 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6687
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-M-SE-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 124mm - 0.25Ω EMMS-ST 1940 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6683
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-S-SE-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 102.5mm - 0.15Ω EMMS-ST 2720 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6685
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-S-SEB-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 138mm - 0.15Ω EMMS-ST 2720 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 5 A
  • RS Stock No. 181-6686
  • Brand Festo
  • Mfr. Part No. EMMS-ST-57-M-S-G2
Festo 0 1.8° - - 48 V dc - Hybrid 6.35mm 5 A - 20.6mm 95mm - 0.25Ω EMMS-ST 1940 RPM - -
Festo Hybrid Stepper Motor 1.8°, 48 V dc, 9.5 A
  • RS Stock No. 181-6690
  • Brand Festo
  • Mfr. Part No. EMMS-ST-87-S-S-G2
Festo 0 1.8° - - 48 V dc - Hybrid 11mm 9.5 A - 27mm 82.6mm - 0.1Ω EMMS-ST 2130 RPM - -
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