Full Answer
What does kV have to do with motor speed?
Instead, Kv has to do with the back-emf I talked about above. The motor Kv constant is the reciprocal of the back-emf constant: So Kv tells us the relationship between motor speed and generated back-emf. A 2300 Kv motor will generate a 1 V back-emf when the motor is rotating at 2300 RPM.
What does kV mean for drones?
“Kv” (not to be confused with “kV” the abbreviation for kilovolt) talks about the constant velocity of a motor. Therefore, the Kv rating for a motor is an indication of the number of revolutions per minute (RPM) of the motor when a given voltage is supplied. How does this apply to drones?
What does the Kv rating of the Hyperion 3025/6 mean?
The Kv rating of 1255 means the motor of the Hyperion 3025/6 can rotate at 1255 RPM when you apply 1 Volt current without any load. There is a reduction of the RPM of the motor when you attach a propeller to it because of air resistance.
What is kV constant of a brushless motor?
Brushless Motor Kv Constant Explained. The most common description of a motor’s Kv constant is that it is the ratio of the unloaded speed to the applied voltage of a motor. Or RPM per volt, as many people say. The main problem with that description is that it is wrong.
Brushless Motor KV “Rating”
The model I described above was for a brushed DC motor. It turns out that everything above also applies to the type of brushless motors and ESC’s t...
Brushless Torque Constant, Kt
The motor torque constant for brushed DC motors and brushless motors tells you how current relates to torque. In this equation, T is torque, Kt is...
Wait … What? How Can Kt and Ke Be Equal?
They have different units, after all. Nm/A is different than V/(rad/sec). Right?No, they are the same actually. This tells us:Which tells us that t...
What determines the KV of a motor?
The Kv rating of a motor will depend on the exerted power (or in other words, the torque level) of the motor. Also, the number of copper wire windings on the rotating coil of the motor (the armature) will also determine the Kv rating. In general terms, the higher the number of copper windings on the rotating coil of the motor, ...
Why use a high KV motor in drones?
Lighter drones will also have small propellers and by using a high Kv motor, the motor will want to spin the propeller faster, an act that will be successful due to the small size of the prop. As a result, high Kv motors are used in lighter drones or racing drones where speed is prioritized.
What is the KV rating of a Hyperion 3025/6?
The Kv rating of 1255 means the motor of the Hyperion 3025/6 can rotate at 1255 RPM when you apply 1 Volt current without any load. There is a reduction of the RPM of the motor when you attach a propeller to it because of air resistance.
How to tell if two motors are similar?
Two motors may be very similar in their configurations but have different windings (copper windings on the coil of the motor). So an easy way to make a comparison and distinguish the two similar motors is by the Kv rating. Since Kv ratings depend on the number of windings of the motors, the two otherwise similarly configured motors will have ...
Do drones need a low KV motor?
On the other hand, heavier drones, which will have larger props, will require a low Kv motor. A low Kv motor will be able to rotate the motor without any problem and will also be able to generate the high torque needed to lift the motor.
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