Constant Torque vs. Variable Torque: What You Need to Know for VFD Selection

Understanding the difference between constant torque and variable torque is critical when selecting the right VFD (Variable Frequency Drive) for your application. Whether you're working with a centrifugal pump, conveyor, or mixer, knowing your load type ensures better performance, longer motor life, and lower energy costs.

In this video, Keith from eMotors Direct explains what torque is in an electric motor, how torque and speed are related, and gives clear examples of both constant and variable torque loads to help you make confident decisions when sourcing your next motor or drive.


✅ What You'll Learn:
What torque means in electric motors
The difference between constant and variable torque
How to identify a variable torque load
Why torque type matters for VFD selection
How torque and speed relate in motor control
How to choose a VFD based on torque requirements

00:00 – Intro: Why torque matters
00:25 – What is torque in electric motors?
00:39 – What is variable torque?
00:51 – What is constant torque?
01:50 – VFD selection for variable torque loads
02:06 – VFD selection for constant torque loads
02:16 – Real-world example: VFD specs and amp ratings


📦 Ready to source your next VFD or electric motor? Visit: https://www.emotorsdirect.ca/controls...

Have a torque or VFD question? Drop it in the comments and we may feature it in an upcoming video.