![]() When an electrical current passes through the stator coils, it generates a magnetic field that interacts with the permanent magnets on the rotor, creating rotation. The coil wire is coated in enamel to prevent short-circuiting as it’s wound in multiple loops. Motor stator: The stationary part of the motor consists of multiple metal coils.Let’s break down the key components of a motor: These poles are made of several layers of thin metal plates laminated together, with an ultra-thin insulation layer in between. The stator is the stationary part of the motor, consisting of “poles” wrapped with copper wires (windings). “BB” represents the stator height, both measured in millimetres.“AA” represents the stator width (or stator diameter).Additionally, it’s possible to reverse motor direction through software settings: īrushless motor size in RC is typically indicated by a four-digit number – AABB: To reverse the rotation direction, simply swap two of the three wires. You can connect these wires to the ESC in any order. Unlike brushed motors that have only two wires, brushless motors have three wires. To drive a brushless motor, you’ll need an ESC (electronic speed controller). This not only provides better control but also leaves room for extra payload. Even the slightest throttle touch can “shoot the quad into orbit like a rocket.” Piloting skill and experience play a significant role in managing this power.Įven if you only plan to fly a slow and stable aerial photography rig, aim for a thrust-to-weight ratio higher than 3:1 or even 4:1. For acro and freestyle flying, I recommend having at least a 5:1 ratio.Ī higher thrust-to-weight ratio gives a quadcopter greater agility and acceleration but can make it more challenging to control, especially for beginners. Ratios of 10:1 or even 14:1 are not uncommon. Of course, having more thrust available than needed is always a bonus.įor racing drones, the thrust-to-weight ratio (or power-to-weight ratio) should be significantly higher than the example above. That’s 500g thrust produced by each motor for a quadcopter. Insufficient thrust can result in poor control response and difficulties to lift off.įor example, if you have a 1kg drone, the total thrust generated by all of the motors at 100% throttle should be at least 2kg. A general rule of thumb is that the maximum thrust produced by all motors should be at least double the total weight of the quadcopter. To calculate the minimum thrust required for your motor and propeller combination, you’ll need the estimated total weight of your drone. For more information on propeller selection, check out our guide on how to choose propellers for FPV drones: Determining Thrust Requirements It’s better to overestimate the weight and have extra power than to underpower and struggle during takeoff.īy determining your frame size, you’ll be able to establish the maximum propeller size allowed. While it doesn’t have to be 100% accurate, a close estimation is essential. When considering your FPV drone’s total weight, make sure to account for all components: frame, FC, ESC, motors, propellers, RX, VTX, antenna, ESCs, LiPo battery, GoPro, and so on. In this guide, we’ll be focusing solely on brushless motors, which are the go-to choice for most FPV drones. Generally, we tend to brushless motors as they are more durable and powerful, while brushed motors are often used in toy drones as they are cheaper to make. In the world of RC, there are two primary motor types: brushless and brushed motors. Some of the most crucial factors to keep in mind include: I’ll walk you through the process of determining motor size based on the drone you are trying to build, but if you’re focusing on building a 5″ FPV drone, feel free to skip ahead to the “Motor Size” section. If you’re new to the FPV scene, I highly recommend checking out our beginner’s guide to FPV drones first for the basics: īefore choosing a motor, it’s important to have at least a rough idea of the size and weight of the drone you plan on building. ![]() Choosing the Right Motor Size for Your Drone. ![]()
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