Brushless DC (BLDC) motors are becoming increasingly popular due to their efficiency, reliability, and compact size. They are used in a wide range of applications such as drones, electric vehicles, robotics, and more. When it comes to BLDC motors, there are two main types: outrunner and inrunner. In this article, we will explore the differences between these two types of BLDC motors.
Outrunner BLDC Motors
Outrunner BLDC motors are also known as external rotor motors. In this type of motor, the stator is located in the center, and the rotor is located outside the stator. The outer part of the rotor is typically a cylindrical metal casing that contains the magnets, and the inner part is a hollow shaft that rotates around the stator. The shaft is typically attached to a propeller, wheel, or other device that is being driven by the motor.
One of the main advantages of outrunner BLDC motors is their high torque, which makes them ideal for applications that require high power output, such as drones and electric vehicles. They also have a high efficiency, which means that they can convert a large portion of their electrical energy into mechanical energy.
Another advantage of outrunner BLDC motors is their ability to spin at low speeds while still maintaining a high torque. This is because the outer rotor provides a larger moment arm, which allows the motor to generate more torque with a lower speed. Outrunner BLDC motors are also relatively easy to manufacture and maintain, which makes them a popular choice for many industrial applications.
Inrunner BLDC Motors
Inrunner BLDC motors are also known as internal rotor motors. In this type of motor, the stator is located on the outside, and the rotor is located inside the stator. The rotor typically consists of a cylindrical metal casing that contains the magnets, and the shaft is attached to the center of the rotor.
One of the main advantages of inrunner BLDC motors is their high speed. They are typically designed to spin at very high speeds, which makes them ideal for applications that require a high rotational speed, such as medical equipment and power tools. They also have a higher power-to-weight ratio than outrunner BLDC motors, which makes them more suitable for applications that require a lightweight motor.
Another advantage of inrunner BLDC motors is their ability to provide a smooth and precise control of speed and torque. They are often used in applications where a high level of control is required, such as robotics and industrial automation. Inrunner BLDC motors are also known for their quiet operation, which makes them a popular choice for medical equipment and other applications that require a low noise level.
Differences between Outrunner and Inrunner BLDC Motors
The main difference between outrunner and inrunner BLDC motors is the position of the rotor relative to the stator. In outrunner BLDC motors, the rotor is located outside the stator, while in inrunner BLDC motors, the rotor is located inside the stator. This has a number of implications for the performance of the motor.
One of the main differences is the torque-speed characteristics of the motor. Outrunner BLDC motors have a higher torque at low speeds, which makes them ideal for applications that require high torque, such as drones and electric vehicles. Inrunner BLDC motors have a higher speed at low torque, which makes them more suitable for applications that require high speed, such as medical equipment and power tools.Another difference is the power-to-weight ratio of the motor. Inrunner BLDC motors have a higher power-to-weight ratio than outrunner BLDC motors, which makes them more suitable for applications that require a lightweight motor. However, outrunner BLDC motors have a higher torque-to-weight ratio, which makes them ideal for applications that require high torque.
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