# Frequent question: How do I choose a brushless motor for a quadcopter?

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A good rule of thumb for a quadcopter is to aim for a 4:1 power to weight ratio. It is common to see that number double to 8:1 or more in racing quads. To figure your power to weight ratio, you will want to calculate the max static output of the motors divided by the weight of the quad.

## How do I choose a quadcopter motor?

Where to Start?

1. Thrust to Weight Ratio. In all types of multirotor, it is important to make sure that the motors used in your drone can product around 50% more thrust than the actual weight of the drone. …
2. KV Ratings. The KV rating is another essential parameter of the motor. …
3. Motor Size.

## How do I know what size brushless motor to buy?

The Size of brushless motors in RC is normally indicated by a 4-digit number – AABB. “AA” is the stator width (or stator diameter) while “BB” is the stator height, both are measured in mm (millimeter).

## How do you size a brushless motor?

Typically the best place to start when sizing a brushless DC motor is matching motor size (diameter, length). Diameter ranges from 13 mm to 30 mm. Brushless DC slotted motor diameter and length are specified in inches.

## Does higher KV mean faster motor?

Kv describes the RPM (revolutions per minute) a motor does per Volt that is put into it. Generally speaking the more Kv a motor has, the more RPM and more power. For example, a 9000Kv motor would be faster than a 2200Kv motor. … So turns with a lower number means a faster motor.

## What does KV mean on a brushless motor?

Answer: “Kv” refers to the constant velocity of a motor (not to be confused with “kV,” the abbreviation for kilovolt). It is measured by the number of revolutions per minute (rpm) that a motor turns when 1V (one volt) is applied with no load attached to that motor.

## How do you size a drone motor?

A good rule of thumb for a quadcopter is to aim for a 4:1 power to weight ratio. It is common to see that number double to 8:1 or more in racing quads. To figure your power to weight ratio, you will want to calculate the max static output of the motors divided by the weight of the quad.

## Which motor is used for drone?

Generally speaking, brushed motors are used in the smallest drones, whereas larger drones and UAVs will use brushless motors, as they can carry the extra weight of the additional electronics. Brushless drone motors also require an electronic speed controller (ESC) to operate.

## What is a 540 size motor?

Those numbers refer to the motor diameter. 540 has a diameter of 36mm. 380 has a diameter ~28mm. 280 has a diameter of 24mm.

## How do you calculate KV to RPM?

The higher the voltage, the faster a motor spins. The Kv rating designates the RPM a motor will spin at full throttle when unloaded given an input voltage. To estimate the RPM of a motor, simply multiply the Kv value by the battery voltage. Kv is in units of RPM/Volt.

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## How do I choose a brushless DC motor?

The key to rating a BLDC motor is torque. This particular design is rated at 6.9 inch-pounds of torque and like all brushless DC motors, the maximum torque rating is independent of speed. The only limitation is that when the speed is lower than 300 rpm, cogging may occur with the motor.

## Which is the best motor for drone?

5 Best Recommendation for Drone Motors

• Coolplay syma x5c-1 x5c x5 motors.
• Parrot AR Drone 2.0 motor.
• Hobbypower A2212 brushless motor.
• Emax Mt2213 brushless motor.

## How much thrust does my drone need?

In most cases, you should plan for a 2:1 thrust to weight ratio, to allow your drone to hover at just half throttle. The higher the thrust to weight ratio, the easier it is to control your drone in elaborate aerobatics.

## What do the numbers mean on drone motors?

Motor Size and KV

Brushless motors are typically categorized by a four-digit number – such as **##. where as the “**” numbers are the stator width and “##” is the stator height. Essentially, the wider and taller the motor is, the larger the numbers are and the more torque it can produce.