Temperature Rise: A "Warning Light" for Motor Health

Temperature rise refers to the increase in the temperature of a motor after it has been running under rated load for a period of time. It is like a "warning light" for the motor's health, reflecting the degree of heat generated by the motor during operation. When the motor is running, the current passing through the windings will generate resistance losses, and there will also be energy losses during the mechanical energy conversion process. All these will be converted into heat energy, causing the motor temperature to rise. If the temperature rise is too high and exceeds the tolerance range of the motor, it will accelerate the aging of the insulating materials inside the motor, reduce the performance and lifespan of the motor, and even cause motor failure. The requirements for motor temperature rise vary among different types and uses of unmanned aerial vehicles. Generally speaking, consumer-grade drones, due to their relatively short flight time, have relatively looser requirements for temperature rise. For industrial-grade drones, especially those that need to operate continuously for long periods of time, such as mapping drones and power inspection drones, the requirements for motor temperature rise are relatively strict. Better heat dissipation designs and materials need to be adopted to ensure that the motor temperature remains within a safe range during long-term operation. Selection and Compatibility: Creating the perfect flight combinationWhen choosing brushless motors for drones, it's like carefully selecting actors for a grand performance. Each "actor" must be able to cooperate perfectly to present a wonderful "performance". This requires us to take into account a variety of factors comprehensively to ensure that the motor is perfectly compatible with other components of the drone and create the best flight combination. First of all, the size and weight of the motor must match the fuselage structure and load-carrying capacity of the unmanned aerial vehicle.If the motor is too large in size and too heavy in weight, it is like forcing a huge person into a small car. This not only increases the burden on the drone and affects its flight performance, but may also cause the drone to be unable to take off normally. Conversely, if the motor is too small in size or too light in weight, it is like a small horse pulling a big cart, unable to provide sufficient power for the drone, which will also affect flight stability and mission completion capability. Secondly, the KV value of the motor should be in line with the propeller it is paired with and the flight requirements of the unmanned aerial vehicle. As mentioned earlier, high-kV value motors have high rotational speeds but low torque, making them suitable for small-sized propellers and scenarios where high-speed flight is pursued. Low KV value motors have high torque but slow rotational speed, making them suitable for large-sized propellers and tasks that require heavy loads and long durings.Heads up: Your motor’s KV value and propeller size have to get along—mismatch them, and trouble hits.

Take a high KV motor (think "speedy but not super strong") paired with a big propeller. That motor’s gonna struggle to spin that prop—like trying to pedal a bike with huge wheels when you’re tiny. Power’ll be weak, and worse? The motor and ESC might overload and burn out from working too hard. On the flip side: Low KV motor (slow but tough) with a tiny prop. Yeah, the motor can spin it easy—like using a sledgehammer to tap a nail. But it’s wasting its potential! You’ll also get bad lift—your drone might not even take off, or it’ll fly all wobbly once it does.This version uses relatable analogies (bike wheels, sledgehammer) to make KV-propeller matching click fast—perfect for when viewers are watching or glancing at graphics.If you want to tweak the tone (more casual, more energetic) or shorten it further for a quick cut, just let me know! First rule: Motor + ESC = BFFs. Think ESC = the motor’s boss—it controls speed and on/off. If they don’t match (like ESC can’t handle motor’s power), it’ll overheat, burn out, and crash your drone! So: 1) Check ESC voltage/current matches motor. 2) Stick to trusted brands—no cheap duds. Next: Motor cooling + protection = must-haves. Drones spin motors fast, hot—if heat can’t escape (bad cooling), motor dies fast. Look for heat sinks, fans, or water cooling (for big drones). And if you fly dusty/humid/rainy? Get a motor that blocks gunk—no dirt/water breaking parts. Last: Pick motor for YOUR use. Long aerial photos? Need efficient, long-battery motors. Delivery drones? Need torque (twist power) + heavy-load skills. No need for over-the-top motors if you just fly for fun—match specs to what you do.