Synchronous vs. Induction Motor: Key Differences

By RF Wireless Expert Team

Last Updated: August 25, 2026

This article highlights the differences between synchronous motors and induction motors, two common types of electric motors.

Synchronous Motor vs. Induction Motor Comparison

Feature	Synchronous Motor	Induction Motor
Starting	Not self-starting	Self-starting
Speed	Average speed is always synchronous; independent of load.	Normal speed is less than synchronous, and decreases as load increases.
Power Factor	Can operate at all power factors (lagging or leading).	Operates only at a lagging power factor.
Speed Control	Speed control is generally not a factor.	Speed can be controlled, particularly in smaller units.
Excitation	Requires a DC exciter.	No exciter is required.
Cost	More expensive to manufacture.	Much cheaper to manufacture.
Applications	Used for mechanical output and to improve power factor (as a synchronous condenser).	Primarily used to supply mechanical load.

Keep Reading

Terminology/Components
Permanent Magnet Synchronous Motors (PMSM)
Explore the construction, operation, advantages, and applications of Permanent Magnet Synchronous Motors (PMSMs), known for their high efficiency and precise control.
Terminology/Components
Squirrel Cage vs. Slip Ring Induction Motors: Key Differences
Compare squirrel cage and slip ring induction motors based on copper losses, starting torque, efficiency, speed variation, and application. Understand their distinct advantages and use cases.
Terminology/Other Wireless
AC Generator vs. DC Generator: Key Differences Explained
Explore the distinctions between AC and DC generators, including their construction, functionality, advantages, and disadvantages. Learn how each converts mechanical energy into electrical energy.
Terminology/RF Components
AC Motor vs. DC Motor: Key Differences Explained
Explore the fundamental differences between AC and DC motors, covering current type, motor types, basic parts, and speed control.
Terminology/Other Wireless
AC vs. DC Transmission: Advantages and Disadvantages
A comparison of AC and DC power transmission, highlighting their advantages, disadvantages, and key differences in electrical systems.
Terminology/RF Components
Active vs. Passive Components: Key Differences & Examples
Explore the core differences between active (transistors, diodes) and passive (resistors, capacitors) electronic components. Learn about their functions and characteristics.