1. What is the BLDC Motor Voltage Equation?

The BLDC (Brushless DC) motor voltage equation calculates the required voltage to achieve a certain RPM based on the motor's Kv rating. The Kv rating indicates how many RPM the motor will turn per volt applied (with no load).

2. How Does the Calculator Work?

The calculator uses the simple equation:

Where:

• \( V \) — Voltage (Volts)
• \( RPM \) — Desired revolutions per minute
• \( K_v \) — Motor velocity constant (RPM per Volt)

Explanation: This equation gives the theoretical voltage needed to achieve a certain RPM under no-load conditions. Actual voltage may vary under load.

3. Importance of Voltage Calculation

Details: Understanding the relationship between voltage and RPM helps in selecting appropriate power supplies, ESCs (Electronic Speed Controllers), and for predicting motor performance.

4. Using the Calculator

Tips: Enter the desired RPM and the motor's Kv rating. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this the actual voltage under load?
A: No, this is the theoretical no-load voltage. Under load, you'll typically need higher voltage to maintain the same RPM.

Q2: How do I find my motor's Kv rating?
A: The Kv rating is usually specified by the motor manufacturer in the motor's datasheet or specifications.

Q3: Can I use this for brushed DC motors?
A: The basic principle is similar, but brushed motors may have different characteristics due to brush friction and other factors.

Q4: What if my motor doesn't reach the calculated RPM?
A: This could be due to load, inefficiencies, voltage drop, or ESC limitations. The calculation assumes ideal conditions.

Q5: How does battery voltage relate to this calculation?
A: Your power supply/battery voltage should match or exceed the calculated voltage to achieve the desired RPM.