Usually before we fly, we will adjust our various parameters in Betaflight. When you click on the PID module, you will find that there are two functions, one is the throttle limit and the other is the motor output limit. What's the difference between them? Under what circumstances would we use them?
The "transient throttle limit" refers to limiting the throttle sent by the remote controller to the flight controller. The flight controller's throttle controls the average throttle value of the four motors. In other words, even if you limit the throttle value to 80%, if you roll your drone at full throttle, or if propeller washing or vibration occurs at full throttle, the actual speed of the motor will still exceed the original speed of 80%. If you need to limit the speed of this motor, then you need to set the motor output limit.
The "motor output limit" limits the throttle value that the flight controller sends to the Dshot throttle signal on the ESC. This throttle value has a total of 2048 bits, of which bits 0-47 are used for a special purpose of Betaflight, including buzzing and motor reversal. Bits 48-2047 are the actual throttle signal values. If you set the motor output limit and set it to 80%, it will limit the 2000 bit to the 0-1600 bit, so that you can limit the motor speed and its output power. If you want to use a battery with a high S and a motor with a low S KV, such as a 6S battery with a 4S motor, you need to limit the motor output power to ensure that the motor does not exceed the rated power and avoid motor burnout.
If the motor has an output power limit, can it be used as a low S KV motor? Should I use P2207 2550KV and limit the output power so that it can be used as a 6S motor?
The answer is no, high KV motors cannot be completely used as low KV motors. For example, in our F60Pro V 1750KV, the throttle is divided into 2000 parts. The speed corresponding to each throttle change is 1750/2000, which will be a relatively small value. If it is a high KV motor, such as 2550KV, when your throttle is divided into 2000 parts, the speed change corresponding to each part of the throttle will become greater. Even if the motor output and Dshot throttle range are limited, the speed change corresponding to each throttle is still larger than that of a low KV motor. This will cause the drone to have an unsmooth operating feel during flight, making it impossible to achieve the smooth operating feel of a low KV motor. This is why high KV motors cannot be used as low KV motors even if the motor output is limited.
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