1. What is Motor Starts per Hour?

The Motor Starts per Hour calculation determines how frequently a motor can be safely started within one hour based on its on and off times. This is important for preventing motor overheating and ensuring proper operation.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( t_{\text{off}} \) — Motor off time in minutes
• \( t_{\text{on}} \) — Motor on time in minutes

Explanation: The equation calculates how many complete start-stop cycles can fit into 60 minutes based on the duration of each cycle (off time + on time).

3. Importance of Motor Starts Calculation

Details: Excessive motor starts can cause overheating, mechanical stress, and reduced motor lifespan. This calculation helps determine safe operating limits.

4. Using the Calculator

Tips: Enter both off time and on time in minutes. Values must be non-negative and their sum must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is motor starts per hour important?
A: It helps prevent motor damage from excessive starting, which causes high inrush currents and heat buildup.

Q2: What's a typical maximum starts per hour?
A: This varies by motor type and size, but typically ranges from 4-12 starts per hour for standard motors.

Q3: How does duty cycle affect starts per hour?
A: Longer on/off times result in fewer starts per hour. Short cycling (frequent starts) may require special motor designs.

Q4: Should this calculation be used for all motor types?
A: This is a general calculation. Consult manufacturer specifications for specific motors, especially high-efficiency or specialty motors.

Q5: How does ambient temperature affect starts per hour?
A: Higher ambient temperatures typically require reduced starts per hour to prevent overheating.