1. What is Synchronous Speed?

Synchronous speed (N_s) is the theoretical speed at which the magnetic field rotates in an AC motor. It depends on the frequency of the AC power supply and the number of poles in the motor.

2. How Does the Calculator Work?

The calculator uses the synchronous speed formula:

Where:

• \( N_s \) — Synchronous speed (RPM)
• \( f \) — Frequency of AC power supply (Hz)
• \( p \) — Number of poles in the motor

Explanation: The formula shows that synchronous speed is directly proportional to frequency and inversely proportional to the number of poles.

3. Importance of Synchronous Speed

Details: Synchronous speed is crucial for understanding motor performance, designing motor control systems, and determining slip in induction motors.

4. Using the Calculator

Tips: Enter frequency in Hz and number of poles (must be even number). Typical values are 50Hz or 60Hz for frequency, and 2, 4, 6, etc. for poles.

5. Frequently Asked Questions (FAQ)

Q1: Why is the number of poles always even?
A: AC motors are designed with pairs of north and south poles, so the number of poles is always even.

Q2: What's the difference between synchronous and actual speed?
A: In induction motors, actual speed is slightly less than synchronous speed due to slip.

Q3: What are typical synchronous speeds?
A: For 60Hz systems: 3600 RPM (2-pole), 1800 RPM (4-pole), 1200 RPM (6-pole). For 50Hz: 3000 RPM, 1500 RPM, 1000 RPM respectively.

Q4: Can synchronous speed be achieved in practice?
A: Only in synchronous motors. Induction motors always run slightly slower than synchronous speed.

Q5: How does voltage affect synchronous speed?
A: Voltage doesn't affect synchronous speed, only frequency and number of poles do.