IGBT vs MOSFET in Treadmills – Motor Drive Circuit Explained
Understand the core of your treadmill's motor control. This guide explains the role of IGBTs and MOSFETs, how they work, and what happens when they fail.
The Heart of Motor Control: PWM
Treadmill speed is controlled by Pulse Width Modulation (PWM), which involves rapidly switching power on and off to the motor. IGBTs and MOSFETs are the high-power electronic switches that do this job.
What are MOSFETs and IGBTs?
A simple explanation of what these semiconductor devices are. MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor) and IGBTs (Insulated-Gate Bipolar Transistor) are both used to handle the high current demands of a DC motor.
Why One is Used Over the Other
A brief discussion on their technical characteristics. Generally, MOSFETs are used in lower power home-use treadmills, while more robust IGBTs are found in commercial-grade machines due to their higher voltage and current handling capabilities.
Symptoms of a Failed Transistor
A failed IGBT or MOSFET often results in a direct short circuit, instantly tripping the breaker. It can also fail "open," resulting in the motor not running at all. The component may show visible signs of burning.
Replacing Power Transistors
Replacing these components is an advanced repair that requires desoldering the old part from the control board and soldering a new one. It must be done by a skilled electronics technician.