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Forum Index : Electronics : Inverter Brushed Motor Waveform

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InPhase

Senior Member

Joined: 15/12/2020
Location: United States
Posts: 178

Posted: 10:31pm 07 Jul 2022

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So I have been testing the new inverter and have finally pushed it beyond the 2 kW mark! But I noticed that a brushed leaf blower motor causes the waveform distort strangely. The running power of the motor is only about 500 watts. No other load has caused such a distortion. Since I don't have much experience with this, I thought I might ask you fine gentlemen. Is this normal for a noisy brushed motor?

The pic is attached. Sorry for the blur. Thanks for your time.

Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 1130

Posted: 10:48pm 07 Jul 2022

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Yes, have seen that, some leaf blowers have a speed control and it will distort the sine wave a little, other brush motors would have a filter capacitor for RF noise.
I have tried the same motor with speed control and it distorts the sinewave far less on the high frequency inverter than on the low frequency inverter, perhaps there is more filtering?
Anyway that sort of distortion hasn't been a big problem yet.
Some brushed motors are better than others for some reason, and can be fine at full speed.
Be interesting to see if something more can be done.

Cheers Aaron
Off The Grid

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