UIM243XX stepping motor controllers are series of microprocessor  embedded, voltage control, miniature stepping motor controller. Its biggest feature is the small size and the driving ability. They can be mounted onto NEMA 17/23 series stepping motor seamlessly  through corresponding flanges. With UIM243XXA/B advanced acceleration function by embedded microprocessors, motors can ramp  up to 1900 RPM in 0.3 seconds (Based on ∠1.8° motor), it can avoid  crash caused by the fast start up frequency. Users can set the speed  by fine-tune the resistance (UIM243XXA) or through an external  adjustable potentiometer (UIM243XXB) or use 0-5V voltage. Once  powered on, it can run without host compuer’s control. Its high-speed  current compensation can compensate for the impact caused by  back-EMF when the motor is running at high speed. The enclosure is  made of die-cast aluminum which provides a rugged, durable  protection and improves the heat dissipation.

Micro-integrated Design
• Miniature size 42.3mmx42.3mmx16.5mm 
• Integral design to fit motors, work independently as well
• Made of die-cast aluminum which provides a rugged, durable protection and improves the heat dissipation

Motor Drive Characteristics
• Built-in pulse generator, motor turning when power on, Online controlled start/stop, forward/reverse run, offline/enable
• On-board potentiometer speed control
• External potentiometer speed, 0.15-1900RPM (UIM243XXB) 
• External voltage regulation, 0.15-1900RPM (UIM243XXB) 
• Automatic current reduction by half, energy saving