The HKD PWM DC Motor Speed Controller is a compact and efficient module designed to control the speed and direction of DC motors using Pulse-Width Modulation (PWM). This controller supports DC input voltages from 6V to 28V and can handle motors drawing up to 3A of current, making it suitable for small to medium DC motor applications in automation, DIY electronics, and robotics.
Working Principle
This controller regulates motor speed by adjusting the duty cycle of the PWM signal-essentially, how long the motor receives voltage in each cycle.
Higher duty cycle (closer to 100%) = motor runs faster.
Lower duty cycle (as low as 5%) = motor runs slower.
Reversible Function: Through the onboard switch, users can easily control the motor to rotate forward, backward, or stop.
Potentiometer with switch: The knob simultaneously adjusts speed and toggles power on/off.
This allows for precise, variable speed control without sacrificing motor torque at lower speeds, as happens in resistive (voltage-drop) speed controls.
Key Features
PWM-based motor speed control for high efficiency and precision.
Wide input voltage range: 6V to 28V DC.
Supports up to 3A of continuous current with an 80W max power rating.
Adjustable duty cycle from 5% to 100%.
Built-in reversing switch: enables forward/reverse motor control and stopping.
Compact design for easy integration in DIY and embedded projects.
Potentiometer with switch: dual function for both control and power.
Specifications
Input Voltage Range: DC 6V - 28V
Max Output Current: 3A continuous
Max Power Output: 80W
PWM Duty Cycle Range: 5% - 100%
Control Method: Manual potentiometer with integrated on/off switch
Direction Control: Reversible motor direction switch (Forward/Reverse/Stop)
Module Dimensions: 50 mm x 32 mm x 15 mm
Motor Connection: Polarity-insensitive (reversible by wire swapping)
Important Usage Notes
Do NOT connect to AC mains (220V) - This module only accepts DC input. Connecting it to AC will destroy the module and pose serious risk.
This is not a power supply; it requires a proper DC power source and a motor connected to function correctly.
Measuring output voltage with a multimeter without a motor connected will yield inaccurate or zero readings-PWM signals must be loaded to be measured properly.
Motor wiring is non-polarized-you can connect the motor wires in either orientation. If the motor runs in the opposite direction from what you want, simply reverse the wiring or use the built-in switch.
Common Applications
DIY electric vehicles and robotic platforms
Small conveyor belts or linear actuators
DC fans, pumps, or model train controls
Educational electronics and prototyping
What's in the box
1 x HKD PWM DC Motor Speed Controller
