1. What is Motor Torque Calculation?

The motor torque calculation determines the rotational force produced by an electric motor at a given power and speed. This is crucial for designing electric vehicle transmissions to ensure proper power delivery and vehicle performance.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque in Newton-meters (Nm)
• \( P \) — Power in kilowatts (kW)
• \( N \) — Rotational speed in revolutions per minute (RPM)
• 9550 — Conversion factor combining unit conversions and constants

Explanation: The formula converts power (energy per unit time) to torque (rotational force) at a specific speed, accounting for the relationship between angular velocity and power.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for transmission design, ensuring the motor can provide sufficient force at all required speeds without overloading components.

4. Using the Calculator

Tips: Enter power in kW and speed in RPM. Both values must be positive numbers. The calculator will compute the torque in Nm.

5. Frequently Asked Questions (FAQ)

Q1: Why is 9550 used in the formula?
A: It combines the conversion factors between kW to W (1000), minutes to seconds (60), and radians to revolutions (2π) into one constant (1000×60)/(2π) ≈ 9550.

Q2: What is typical torque for EV motors?
A: EV motors typically produce 200-400 Nm, with some high-performance models exceeding 600 Nm. This is often amplified through gear reduction.

Q3: How does torque relate to vehicle acceleration?
A: Higher torque at the wheels (after gearing) results in better acceleration. The actual acceleration depends on total vehicle mass and drivetrain efficiency.

Q4: What affects motor torque output?
A: Torque depends on motor design (pole count, winding), battery voltage, controller settings, and thermal conditions (reduces when overheating).

Q5: How is this different from wheel torque?
A: Wheel torque is motor torque multiplied by the gear ratio. This calculator gives motor shaft torque before any gear reduction.