Effective Traits of Brushless DC Motors!

 AC induction motors were previously employed in water heaters and air conditioners. These days, most consider gas water heaters and air conditioners as necessary. However, this motor has glaring flaws, including low efficiency and high energy consumption, which are obviously significant flaws with the current fashion for low-carbon environmental preservation, energy efficiency, and a decrease in carbon emissions.   

Also, depending on the situation, a gas water heater and an air conditioner will require a varied air volume. Building Brushless DC Motors is significantly more straightforward due to removing collector rings and brushes for excitation. Not only does the motor process improve, but the mechanical dependability and life of the motor are also considerably boosted.  


While this is going on, flux density can significantly enhance motor indicators to produce the optimal design, making the motors smaller and lighter.  

  

Unique Characteristics of Brushless DC Motor 

  • Permanent magnet excitation prevents the loss of the excitation current generated by induction motors; in the meantime, PM BL DC motors run synchronously and avoid the loss of the induction motor rotor core. Due to these two factors, BL DC motor efficiency is significantly better than induction motor efficiency, especially for small-capacity motors.  


  • Since the brushless DC motor's excitation magnetic field does not require reactive power current, it has a far more significant power factor than an induction motor. It can operate at power factor 1, which is advantageous for small power motors. Brushless motors are more efficient at functioning under load than induction motors and perform better under light loads.

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  • Speed control for brushless DC motors is easier to use than variable frequency control for induction motors and offers more excellent speed performance.  


  • The bearings used in the motor significantly impact the brushless DC motor's lifespan. Motor life can be up to 20,000 hours or more, depending on factors like the choice of high-quality bearings.  


  • The brushless DC motor requires a rectangular-wave current; the continuous operating current of the inverter refers to the rectangular wave's peak value. The induction motor requires a sine wave current. In the constant operation of the inverter, rated current often refers to a sine wave. There must be enough distance between the inverter's DC voltage and the electromotive force caused by the motor for the inverter to continue to be able to control the motor current. Therefore, the peak of the induction motor sine wave-induced electromotive force and the trapezoidal wave of brushless DC motors are both constrained by the inverter's DC voltage. When the peak current of an induction motor and a brushless DC motor is equal, the output power of the brushless DC motor is higher by 33% than the output power of the induction motor, meaning that one rectifier or inverter may drive both types of motors.  

 

Conclusion 

To summarize, the AC induction motor in the gas water heater and air conditioning will be totally replaced with a brushless DC blower. BLDC motors are also used in home appliances, cars, office equipment, and other industries due to technological advancements.  

 

Location: United States

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