1. What is Motor Torque Curve?

The torque curve shows how an electric motor's torque output varies with rotational speed (RPM). It's a fundamental characteristic that determines the motor's performance across its operating range.

2. How Does the Calculator Work?

The calculator uses the fundamental torque formula:

Where:

• \( Power \) — Motor power in kilowatts (kW)
• \( RPM \) — Rotational speed in revolutions per minute
• 9550 — Conversion factor (derived from 60,000/(2π))

Explanation: The calculator generates torque values across the specified RPM range to show how torque decreases as speed increases for constant power.

3. Importance of Torque Curve

Details: The torque curve is essential for motor selection, determining acceleration capabilities, and understanding performance at different operating speeds.

4. Using the Calculator

Tips: Enter motor power in kW, specify the RPM range to analyze, and set the step size for results. Typical electric motors operate between 0-3000 RPM, but enter your motor's actual specifications.

5. Frequently Asked Questions (FAQ)

Q1: Why does torque decrease as RPM increases?
A: For constant power applications, torque must decrease as speed increases because power is the product of torque and speed (P = τ × ω).

Q2: What's typical torque for a 10kW motor at 1500 RPM?
A: Approximately 63.67 Nm (10 × 9550 / 1500).

Q3: Does this apply to all motor types?
A: This calculation applies to motors operating in their constant power region. Some motors have constant torque at low speeds.

Q4: What's the 9550 constant?
A: It's the conversion factor from kW and RPM to Nm (60,000/2π) to account for unit conversions.

Q5: How accurate is this for real motors?
A: This provides theoretical values. Actual motors have efficiency losses and may have different torque characteristics at extremes of their operating range.