BLD-70B — 70W Low-Voltage BLDC Motor Driver

The BLD-70B is a compact, high-performance and cost-effective brushless DC motor driver designed for low-voltage BLDC motors from 10W to 70W. It supports 12–24VDC operation and provides built-in potentiometer, external analog, and PWM speed control options.

The BLD-70B supports both open-loop and closed-loop speed control, with a 5-second stall waiting function and external BRK input for motor braking and alarm reset. An optional Modbus communication interface is available for applications requiring control through a PLC, touchscreen, or PC.

For compatible motor solutions, see the Apexwell Brushless DC Motor range.

Key Features

• Designed for 10W–70W low-voltage BLDC motors

• 12–24VDC recommended operating voltage

• Built-in potentiometer speed control

• External analog voltage speed control

• PWM speed control

• Selectable open-loop or closed-loop speed control

• 5-second stall waiting function

• BRK external braking and alarm reset input

• Optional Modbus communication for PC or touchscreen control

• Optional adjustable output power

• Natural or forced cooling

Shared Specifications

Control Functions

Speed Control

The SV input supports three speed control methods:

• External potentiometer

• External analog signal

• PWM pulse signal

The built-in potentiometer provides an additional speed adjustment option for applications that do not require an external controller.

Direction and Braking

The F/R input controls motor rotation direction, while the BRK input provides motor braking control.

• F/R open: Forward rotation

• F/R connected to GND: Reverse rotation

• BRK open: Motor runs

• BRK connected to GND: Motor stops

Protection and Status Indication

The BLD-70B provides fault indication for conditions including overvoltage, Hall signal errors, motor stall, and over-temperature. When a fault occurs, the driver stops operation and indicates the corresponding alarm status.

The driver supports three alarm reset methods:

• Set the internal or external speed control to zero

• Close and then release the BRK input

• Power the driver off and on again

For detailed wiring and alarm handling information, please refer to the BLD-70B product documentation available through the Apexwell Download Center.

Typical Applications

The BLD-70B is suitable for equipment using 10W–70W low-voltage brushless DC motors, including:

• Compact automation equipment

• Small pumps and fans

• Conveying and feeding systems

• Laboratory equipment

• Medical equipment

• Electronic equipment

• Small motion-control systems

• OEM equipment requiring adjustable BLDC speed control

Why Choose the BLD-70B

The BLD-70B combines multiple speed-control methods, open-loop or closed-loop operation, braking control, and protection functions in a compact driver for 10W–70W BLDC motors. Its 12–24VDC operating range and optional Modbus communication make it suitable for both standalone speed control and integration into automated equipment.

Apexwell can also support application-specific motor and driver configurations according to voltage, power, speed, installation, and control requirements. 

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

For driver selection or a matched BLDC motor solution, Contact Apexwell with your motor power, voltage, speed, and control requirements.