Why Is BLDC Motor Better Than Induction Motor?
Induction drives and DC brushless drives both use motors with comparable stator types. Utilizing 3-phase modulating inverters are both drives. The inverter controls and the rotors are the only modifications.
The only control variations with digital controllers are in the control code. (While induction drives only need a speed sensor, DC brushless drives need an absolute position sensor; these changes are minimal.)
The DC brushless drive produces significantly less rotor heat, which is one of the key distinctions. With this drive, rotor cooling is simpler, and peak point efficiency is typically higher. The optimal power factor for the induction drive is around 85%, however, the DC brushless drive can also function at a unity power factor. As a result, a DC brushless drive will often have a greater peak energy efficiency than an induction drive by a few percentage points.
In contrast, since B is proportional to V/f, induction machines have no magnets and may change their B fields. Thus, with low loads, the inverter can lower the voltage to minimize magnetic losses and optimize efficiency.
Therefore, the induction machine has an advantage over a DC brushless machine when used with a smart inverter since magnetic and conduction losses can be swapped to maximize efficiency. As performance improves, this advantage becomes more crucial.
As a machine gets bigger, DC brushless, the magnetic losses go up proportionately, and part load efficiency goes down. With induction, losses do not always increase as machine size increases.
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