Also, if the supply voltage is very high compared to what the motor needs to achieve the set current, the duty cycle will be very low, which also leads to significant differences between average and RMS currents. The current limit, I MAX , relates to the reference voltage as follows:. Four, six, and eight-wire stepper motors can be driven by the A if they are properly connected; a FAQ answer explains the proper wirings in detail. The following picture shows how to identify which current sense resistors your board has:. The driver requires a logic supply voltage 3 — 5.
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In particular, increasing the voltage generally allows for higher step rates and stepping torque since the current can change more quickly in the coils after each step. Navigation Main page product Experiment Tutorials.
Pololu – A Stepper Motor Driver Carrier
You can also solder your motor leads and other connections directly to the board. This carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikesespecially when using power leads longer than a few inches.
Stepper motors typically have a step size specification e. Step and microstep size Stepper motors typically have a step size specification e. Schematic diagram of the A stepper motor driver carrier both green and black editions.
Note that we carry several stepper motor drivers that can be used as alternatives for this module and drop-in replacements in many applications: For instance, driving a motor in quarter-step mode will give the step-per-revolution motor microsteps per revolution by using four different current levels.
Note that the STEP and DIR pins are not pulled to any particular voltage internally, so you should not leave either of these pins floating in your application. The coil current can be very different from the power supply current, so you should not use the current measured at the power supply to set the current limit. The MP carrier can deliver up to 1. One way to set the current limit is to put the driver into full-step mode and measure the current running through a single motor coil while adjusting the current limit potentiometer.
Since the input voltage to the driver can be significantly higher than the coil voltage, the measured current on the power supply can be mixrostepping a bit lower than the coil current the driver and coil dmox act like a switching step-down power supply. The driver requires a logic supply voltage 3 — 5. There are no phase sequence microstelping, high frequency control lines, or complex interfaces to program.
A4988: DMOS Microstepping Driver with Translator and Overcurrent Protection
The A interface is an ideal fit for applications where a complex microprocessor is unavailable or is overburdened. The A supports such active current limiting, and the trimmer potentiometer on the board can be used to set the current limit. N header pins soldered?
If this is not your local representative, find your local sales rep here. Add to cart Add to wish list. In Mixed decay mode, the device is set initially to a fast decay for a proportion of the fixed off-time, then to mictostepping slow decay for the remainder of the off-time.
Unipolar motors with five leads cannot be used with this driver. Feedback Comments or questions?
This board is a drop-in replacement for our original and now discontinued A stepper motor driver carrier. For details about these power states, see the datasheet. This board ships with 0. Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver.
Motor connections Four, six, and eight-wire stepper motors can be driven by the A if they are properly connected; a FAQ answer explains the proper wirings in detail. Some unipolar stepper motors e.
Please note that measuring the current draw at the power supply will generally not provide an accurate measure of the coil current. The DRV carrier works with motor supply voltages as low as 2.
A Stepper Motor Driver Carriers. Take care when handling this product and other components connected to it. Select variant Several alternatives are available for this product.