1.What is a brushless DC motor
The brushless DC motor is a typical mechatronics product, consisting of a motor body and a driver. It has no brushes and commutators, and uses an electronic commutator to control the direction of the current to achieve the rotation of the motor. Brushless DC motors usually use permanent magnets, and modern technology often uses rare earth neodymium iron boron materials with high magnetic energy levels, which makes them smaller and more efficient.
2.Working principle of brushless DC motors
The working principle of brushless DC motors is to adjust the speed and direction of the motor through an electronic control system. The motor consists of a motor body and a driver, and the driver includes a power supply unit and a control unit. The power supply unit provides three-phase power to the motor, and the control unit converts the input power frequency according to demand to control the frequency of the stator rotating magnetic field. The speed of the motor rotor will be fed back to the control center through a feedback mechanism, and repeatedly corrected to achieve a method close to the characteristics of a DC motor.
3.Methods to improve the life of brushless DC motors
1.Optimize the operating environment: Keep the motor running within a suitable temperature range and avoid long-term high-temperature operation. Use effective heat dissipation measures, such as installing cooling fans and using heat sinks, to ensure that the motor can dissipate heat in time when working.
2.Control voltage and load: Ensure that the motor operates under rated parameters, especially voltage and load. The voltage should not be too high or too low, and the load should be controlled within the rated value, and try to avoid the mechanical and electrical impact of impact loads on the motor.
3.Regular maintenance: Pay attention to regular general maintenance, especially for DC motors, and clean the dust generated by brushes in time to avoid affecting the insulation of the motor and increase the service life of the brushes.
4.Use motor modules provided by professional suppliers: Use brushless DC motor modules provided by professional suppliers. These modules usually integrate sensorless control functions, which can calculate control equations in real time, improve system reliability and reduce total system cost.
5.Intelligent motor control function: Use intelligent motor control functions to easily tune the motor, and solve the system performance parameter requirements (such as speed, efficiency and noise) by developing sensorless trapezoidal control algorithms to improve the overall performance and reliability of the system.
4.Technical features of brushless DC motors
1.High efficiency and energy saving: Brushless DC motors are more efficient than traditional brushed DC motors and can automatically adjust current when the load changes, thereby saving energy.
2.Low noise: Since brushless DC motors do not require carbon brushes, they are quieter and quieter during operation.
3.Long life: Brushless DC motors have a long life because they are not subject to friction and wear, and there is no wear of carbon brushes, which makes their service life longer.
4.High reliability: Brushless DC motors do not require carbon brushes, and there is no wear and fall of carbon brushes, so they have higher reliability.
5.High power density: The rotor of a brushless DC motor is composed of permanent magnets. Compared with a brushed DC motor, it has a higher power density and a smaller size, and can provide more power in a certain space.
6.Good external characteristics: Brushless DC motors can output large torque at low speeds, and have good starting performance and speed adjustment range.
7.Small size and light weight: The brushless DC motor has a small size and high power density, and is suitable for use in places with limited space.
8.Good regenerative braking effect: Since the rotor is a permanent magnet material, the motor can enter the generator state during braking to achieve energy recovery.
9.Fully enclosed structure: The brushless DC motor adopts a fully enclosed structure, which can prevent dust from entering the motor and improve reliability.
10.Strong adaptability: The brushless DC motor is resistant to bumps and vibrations, has low noise, low vibration, smooth operation and long life.
Source:https://plaza.rakuten.co.jp/beverlystepper/diary/202411110000/
Posted
Nov 10 2024, 11:25 PM
by
Amaris07