1. What is a Shaft Power to Motor Power Calculator?

Definition: This calculator converts shaft power measured in horsepower (HP) to motor power measured in watts.

Purpose: It helps engineers and technicians determine the equivalent electrical power required for a motor based on mechanical power requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_m \) — Motor power (watts)
• \( HP \) — Shaft power (horsepower)

Explanation: The conversion factor 746 comes from the definition of horsepower (1 HP = 746 watts).

3. Importance of Power Conversion

Details: Proper power conversion ensures correct motor selection, electrical system design, and energy efficiency calculations.

4. Using the Calculator

Tips: Enter the shaft power in horsepower. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 746?
A: This comes from the definition of mechanical horsepower (550 ft-lbf/s) converted to watts (1 watt = 0.7376 ft-lbf/s).

Q2: Is this for electrical or mechanical horsepower?
A: This uses mechanical horsepower. Electrical horsepower is slightly different (1 HP = 746 watts).

Q3: Does this account for motor efficiency?
A: No, this is a direct conversion. For actual motor requirements, divide by the motor's efficiency.

Q4: What's the difference between shaft power and motor power?
A: Shaft power is mechanical output, while motor power is electrical input to achieve that output.

Q5: Can I convert watts back to horsepower?
A: Yes, divide watts by 746 to get horsepower.