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I'm using stepper motor for an application that requires the motor to be extremely silent. (not 3D printing) So I found out that the TMC2130 driver (or TMC2100) does just that. In my research of specs between drivers and motors I've gotten pretty confused. I've come down to using the TMC2130 to drive a Sparkfun ROB-13656‎ stepper motor. Before I purchase I want to make sure the voltage and current ratings of both will work together.

The TMC2130 says it supports stepper motors up to 2.0A coil current (2.5A peak). The ROB-13656 says 2.0A/phase. Is that the same thing as coil current?

The TMC2130 says it has a voltage range of 4.75-46V DC. And the ROB-13656 says Voltage: 3.2V. I know these specs don't correlate since the driver is monitoring the current, but I still don't really understand how they relate to each other.

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  • \$\begingroup\$ There are many existing questions here on stepper motor driving; see the sidebar at right. Typically with a current mode driver you want the driver voltage to be several times the coil ohmic voltage. If you really need silence, a stepper may not be the right motor technology; generally they are used for simplicity, not because they are a very good solution. \$\endgroup\$ – Chris Stratton Apr 28 '18 at 21:54
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You are correct, the pair will work well together.
You don't need to worry about the 3.2 V specified for the stepper motor since the TMC2130 is a switching current regulator. You can expect the motor to get quite warm in operation as the windings will dissipate a bit over 5 W averaged together at 2 A peak drive.
The stepper motor at 125 oz/in is a rather beefy unit but if you are going to be using high micro step ratios then you can expect to see only a fraction of this torque around the zero crossings.

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