Coreless motors are a special type of motor characterized by their small size, light weight, high efficiency, and fast response speed. When selecting coreless motors, brushed and brushless types are two common choices. This article will provide a detailed comparison and analysis of brushed and brushless coreless motors from multiple perspectives.
Basic principles
The basic principles of brushed coreless motors and brushless coreless motors are the same: both generate torque through electromagnetic induction to drive the motor to rotate. However, they differ in some aspects of structure and operating principle.
Brushed coreless motor: A brushed motor has carbon brushes and a commutator on its rotor. Electrical energy is converted into mechanical energy through the contact between the carbon brushes and the commutator. The contact between the carbon brushes and the commutator produces sparks, hence the name brushed motor.
Brushless coreless motors: Brushless motors do not have carbon brushes or commutators on their rotors; instead, they achieve electrical energy conversion through electronic commutators. The electronic commutator automatically adjusts the current direction based on the rotor's position, achieving spark-free operation.
Structural features
Brushed coreless motor: The structure of a brushed motor is relatively simple, mainly consisting of a stator, rotor, carbon brushes, and commutator. The presence of carbon brushes and commutator makes brushed motors relatively large in size and weight.
Brushless coreless motors: Brushless motors have a relatively complex structure, mainly consisting of a stator, rotor, and electronic commutator. Because they lack carbon brushes and a commutator, brushless motors are relatively small in size and weight.
Efficiency and performance
Brushed coreless motors: Brushed motors are relatively inefficient because energy loss occurs due to the contact between the carbon brushes and the commutator. Furthermore, wear on the carbon brushes and commutator also affects motor performance.
Brushless coreless motors: Brushless motors are relatively efficient because the electronic commutator enables spark-free operation, reducing energy loss. Furthermore, brushless motors have a longer lifespan because the electronic commutator does not experience wear and tear.
Noise and vibration
Brushed coreless motors: During operation, the contact between the carbon brushes and the commutator in a brushed motor generates sparks and noise. Furthermore, wear on the carbon brushes and commutator can also cause motor vibration.
Brushless coreless motor: During operation, brushless motors have relatively low noise and vibration because they do not have carbon brushes and commutators.
Maintenance and lifespan
Brushed coreless motors: Brushed motors have relatively high maintenance costs because the carbon brushes and commutator need to be replaced regularly. Furthermore, wear and tear on the carbon brushes and commutator also affects the motor's lifespan.
Brushless coreless motors: Brushless motors have relatively low maintenance costs because the electronic commutator does not experience wear and tear. Furthermore, brushless motors have a longer lifespan, reaching 2-3 times that of brushed motors.
Application scenarios
Brushed coreless motors: Brushed motors are suitable for applications where size and weight requirements are not high, but cost and maintenance requirements are low, such as toys and small equipment.
Brushless coreless motors: Brushless motors are suitable for applications with high requirements for size, weight, efficiency, lifespan and noise, such as drones, robots and precision equipment.
price
Brushed coreless motor: Brushed motors are relatively inexpensive because of their simple structure and low production cost.
Brushless coreless motor: Brushless motors are relatively expensive because of their complex structure and high production costs.
Brushed and brushless coreless motors each have their advantages and disadvantages, and the choice depends on the specific application and requirements. If there are high requirements for size, weight, efficiency, lifespan, and noise, a brushless motor is a better choice. If cost and maintenance requirements are lower, a brushed motor is also a viable option.
