650W 140KV Sensorless Waterproof BLDC Motor, IP28

650W brushless DC motor, waterproof rating IP28, operating voltage 14–37V (compatible with 4–10S batteries). This 140KV outrunner BLDC motor is designed for underwater applications such as electric surfboards, propellers, robotic models, and boosters. Matching controllers and propellers are available. For best value, we recommend purchasing the complete BLDC motor set.

Specification

Note: The motor is powered by 4-10S batteries, S is the number of batteries, voltage of every battery is 3.7V DC.

ESC (Electronic Speed Controller) Selection for Waterproof BLDC Motor

• A BLDC motor can be used with an ESC as long as its speed does not exceed the ESC’s limit.
• BLDC motor speed = Battery Voltage × KV value;
  Stator speed = Battery Voltage × KV value × Pole Pairs.
• The maximum speed limit of the V4 series ESC is 60,000 ERPM.
  The maximum speed limit of the V6 series ESC is 150,000 ERPM.
• If a BLDC motor’s maximum speed surpasses the ESC’s limit, it is possible to match them by lowering the motor’s operating voltage. However, this is not recommended, as it prevents the motor from functioning as a true brushless DC motor.

ESC (Electronic Speed Controller) Specification

Note: The ESC model with * is the recommended controller for this page of motor, if you need other ESC models, please contact us.

Details

Dimension (Unit: mm)

Applications

Jet Ski

Propeller

Robot Model

Electric Surfboard

Q: What is the KV rating of a brushless dc motor?

A: The KV rating indicates how many revolutions per minute (RPM) the BLDC motor will spin per volt with no load. For example, a 140KV motor runs at about 140 RPM for every 1 volt applied. Lower KV means more torque and slower speed, while higher KV means less torque but faster speed.