Stepper Drives & Indexers

Stepper drives are current amplifiers that turn a low-current control signal into higher-current signal to drive stepper motors. They run using a type of open-loop system that takes digital step and direction inputs by a programmable pulse generator known as an indexer.


Types of stepper drives

There are many types of stepper drives, including PWM/chopper drives, L/R drives and recirculating chopper drives. The two most common are bipolar and unipolar drives. 


Bipolar drives have a single winding with two leads per phase. The winding has a current that needs to be reversed so that magnetic poles can also be reversed in the correct order. 


Unipolar drives have one winding with a centre tap per phase. This means that the magnetic pole can be reversed without switching the direction of current, so a single transistor can be used per each individual winding.


What are stepper drives used for?

Stepper drives are most commonly used as current amplifiers in motors. However, they can also be used for any device that operates at more than 50–100 mA. 


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Description Price For Motor Type Current Rating Voltage Rating Board Supply Voltage Motor Supply Voltage Overall Length Overall Width Overall Depth
RS Stock No. 829-3553
Mfr. Part No.BS1D200P10
TWD4,861
Each
units
Bipolar 2 A 36 V dc - - - - -
RS Stock No. 443-0102
Mfr. Part No.53107
TWD1,093
Each
units
Unipolar 350 mA - 10 → 24V dc - 55mm 40mm -
RS Stock No. 877-7216
Mfr. Part No.STR-2M
TWD7,034
Each
units
Bipolar 0.3 → 2.2 A 12 → 48 V dc - - 92.6mm 56mm 20.8mm
RS Stock No. 896-8557
Mfr. Part No.G250 Heatsink + Screws
BrandGeckodrive
TWD243
Each
units
- - - - - - - -
RS Stock No. 829-3556
Mfr. Part No.US1D200P10
TWD4,898
Each
units
Unipolar 3 A 36 V dc - - - - -
RS Stock No. 455-841
Mfr. Part No.ST5-S
TWD15,261
Each
units
Bipolar 5 A - 24 → 48V dc - 3.65in 3in 1.25in
RS Stock No. 877-7225
Mfr. Part No.ST5-Q-NN
TWD24,398
Each
units
Bipolar 0.1 → 5 A 24 → 48 V dc - - 127mm 76.2mm 44.5mm
RS Stock No. 793-4121
Mfr. Part No.G203V
BrandGeckodrive
TWD7,334
Each
units
Stepper Motor 7 A 80 V dc 18 → 80V dc - 2.5in 0.83in 2.58in
RS Stock No. 905-8786
BrandRS Pro
TWD3,177
Each
units
Bipolar 2.2 A 48 V 24 → 48V - 78mm 68mm 21mm
RS Stock No. 240-7920
Mfr. Part No.GSM 2
TWD2,129
Each
units
Unipolar 2 A - - 9 → 40V dc 61mm 46mm 15mm
RS Stock No. 455-863
Mfr. Part No.ST10-SI
TWD28,571
Each
units
Bipolar 10 A - 24 → 80V dc - 5in 3in 1.75in
RS Stock No. 905-8780
BrandRS Pro
TWD5,298
Each
units
Bipolar 4.4 A 48 V 24 → 48V - 92mm 85mm 23mm
RS Stock No. 896-8553
Mfr. Part No.G250X
BrandGeckodrive
TWD3,068
Each
units
Stepper Motor 3.5 A 50 V dc 15 → 50V dc 50V dc 42.55mm 33.66mm 12.7mm
RS Stock No. 896-8566
Mfr. Part No.G540
BrandGeckodrive
TWD19,500
Each
units
Stepper Motor 3.5 A 50 V dc 18 → 50V dc 50V dc 161.8mm 60.2mm 31.75mm
RS Stock No. 793-4127
Mfr. Part No.G201X
BrandGeckodrive
TWD5,491
Each
units
Stepper Motor 7 A 80 V dc 18 → 80V dc - 2.5in 0.83in 2.58in
RS Stock No. 126-0340
Mfr. Part No.G214
BrandGeckodrive
TWD9,471
Each
units
Stepper Motor 7 A 80 V dc - - 69.85mm 71.12mm -
RS Stock No. 793-4133
Mfr. Part No.GM215
BrandGeckodrive
TWD10,080
Each
units
NEMA 17 to 42 Size 7 A - 18 → 80V dc 18 → 80V dc 2.5in 2.5in 0.85in
RS Stock No. 441-0287
Mfr. Part No.PM546
TWD20,043
Each
units
Bipolar 6 A - 24 → 85V dc - 228mm 100mm 34mm
RS Stock No. 455-845
Mfr. Part No.ST5-SI
TWD25,074
Each
units
Bipolar 5 A - 24 → 48V dc - 5in 3in 1.75in
RS Stock No. 126-0339
Mfr. Part No.G320X
BrandGeckodrive
TWD5,762
Each
units
Stepper Motor 20 A 18 to 80 V dc 5V dc - 63.5mm 63.5mm 21mm