Hello,

I'm making a drive for a brushless portable device.

Everybody agree the brushless motors are more efficient than brushed motors. But, when you consider the group drive-motor, it's not true.

There are more commutations in a brushless system than a brushed system. The autonomy of battery is
significantly different in both system.

So, the only reason to use a brusless system is the maintenance ?

Am I right?

Thank you

 

There are more commutations in a brushless system than a brushed system. The autonomy of battery is
significantly different in both system.
Thank you

Where did you get that, does not apply to the average BLDC motor.
Max.

 

Because the pwm signals are used toward MOSFETs. In brushed motors we use direct current.

I don't understand your interrogation.

 

PWM can be used in brushed or brushless. The number of turns of wire is irrelevant.

Read this.

 

Because the pwm signals are used toward MOSFETs. In brushed motors we use direct current.

PWM can and is used in DC brushed and BLDC. in motion control applications, it is necessary to use torque mode with PID feedback when using BLDC, otherwise 'cogging is seen at low RPM due to the coarse commutation, i.e. open loop velocity control produces the low rpm cogging effect..
Max.

 

I think you don't see what I mean.

For a DC brushed motor supplied with a constant voltage without PWM. If we take an brusless motor running at the same RPM than the brushed motor, the brushless group drive-motor has a lower efficiency.

The switching in the drive takes energy lost.

It is right?