BLD-300B — 300W BLDC Motor Driver

The BLD-300B is a high-performance brushless DC motor driver designed for BLDC motors up to 300W at 24VDC or 440W at 48VDC. It supports 18–56VDC input, open-loop or closed-loop speed control, adjustable acceleration and deceleration, and multiple speed control methods including potentiometer, analog signal, and PWM.

With selectable motor pole pairs, adjustable maximum output current, braking, alarm output, and speed feedback output, the BLD-300B provides flexible control for OEM equipment and industrial motion applications.

For compatible motors, see the Apexwell Brushless DC Motor range.

Key Features

• Supports BLDC motors up to 300W at 24V or 440W at 48V

• 18–56VDC input voltage range

• Open-loop and closed-loop speed control

• Adjustable acceleration and deceleration time

• Selectable motor pole pairs

• Maximum output current setting

• Built-in and external potentiometer speed control

• External analog and PWM speed control

• F/R direction control and BRK fast braking

• SPEED output for motor speed monitoring

• ALM alarm output

• Natural cooling or forced-air cooling

Shared Specifications

Speed and Motor Control

The BLD-300B supports multiple speed control methods for different system configurations. Users can select the built-in potentiometer, an external 10 KΩ potentiometer, an external analog signal, or PWM speed control.

The driver also provides adjustable acceleration and deceleration time, selectable motor pole pairs, and maximum output current settings to help match the driver to different BLDC motor and load conditions.

Direction, Stop and Braking Control

The BLD-300B provides dedicated control inputs for motor direction, stopping, and fast braking.

• F/R: Controls motor rotation direction

• EN: Controls motor stop and restart

• BRK: Provides fast motor braking

• SPEED: Outputs a pulse signal corresponding to motor speed

• ALM: Provides a fault alarm output

The SPEED output can be used by the control system to calculate the actual motor speed, while the ALM output changes from 5V during normal operation to 0V when a fault occurs.

Protection and Alarm Functions

The BLD-300B provides protection and alarm indication for common operating faults, including:

• Overvoltage

• Power transistor overcurrent

• Driver overcurrent

• Undervoltage

• Hall signal error

• Motor stall

• Multiple simultaneous alarms

The driver uses LED flashing patterns to indicate different fault conditions, helping users identify the cause and perform troubleshooting.

Typical Applications

The BLD-300B is designed for equipment using medium-power low-voltage brushless DC motors, including:

• Industrial automation equipment

• Conveying and feeding systems

• Pumps and fans

• Medical equipment

• Laboratory equipment

• Electronic equipment

• Robotics and motion-control systems

• OEM machinery

For applications requiring a smaller BLDC driver, see the BLD-70B BLDC Motor Driver.

Why Choose the BLD-300B

The BLD-300B combines a wide 18–56VDC input range, up to 15A output current, open- or closed-loop speed control, and multiple speed adjustment methods in one driver platform. Its adjustable control parameters, braking functions, speed output, and alarm feedback make it suitable for integrating BLDC motors into OEM equipment and automated motion systems.

Apexwell supports application-specific motor and driver configurations based on voltage, motor power, speed, load, installation, and control requirements. 

Visit About Apexwell  to learn more about our OEM motor engineering and customization capabilities.

For detailed technical documentation, visit the Download Center or Contact Apexwell  for a matched BLDC motor and driver solution.