3-8A phase current adjustable UIM 24108 stepper motor controller

Specifications

UIM 24108 stepper motor controller

Embedded DSP microprocessor, in-line operation through RS232

Smart, fault-tolerating and user-friend interface.

Miniature Size 42.3mm*42.3mm*13.5mm

Integrally designed to fit onto motors seamlessly, as well as work standalone

RS232 3-wire serial communication, max 115200 bps, automatic host Baud Rate detecting

12-40VDC supply, max 8A adjustable current

Full, half, quarter and 16th micro-stepping

Dual H-bridge, PWM constant current control

Die-cast aluminum enclosure

Selecting the current level
In a constant-current driver the driver-current level mainly affects the torque at the low frequencies.
Depending on the load torque demand (friction and inertia) as a function of stepping rate, it is often a good idea to reduce the current level to get a more-flat torque characteristics from the motor. This normally decrease resonances and power losses and allows a lower-rated driver circuit.
In Figure 14, the effect of decreased winding current is shown—from the curve we can see that only the low and medium frequencies are affected by the lower current. Power losses at low step rates have also decreased.
The peak output power, however, is not affected as the torque at 2kHz is not decreased.