abc_de
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hello
i am trying to run my single phase induction motor capacitor start with h-bridge by unipolar spwm modulation. output of bridge is 230Vac stable.
i have start motor in linear fashion 5HZ>10hz>15hz>20hz>25hz>30hz>35hz>40hz>45hz>50hz by V/F method.
i have connect output of h bridge direct to L-N terminal of motor.
my problem is motor start is delayed, when it start it vibrates and produce sound after reach 50hz motor vibrates too much.
during motor run time i check the output of h bridge output get distorted very badly. :-( without load output is fine
then i check 230 vac fan motor (which do not have capacitor) it runs fine.
any suggestion what is cause of malfunction :thinker: and how to overcome the problem
i am trying to run my single phase induction motor capacitor start with h-bridge by unipolar spwm modulation. output of bridge is 230Vac stable.
i have start motor in linear fashion 5HZ>10hz>15hz>20hz>25hz>30hz>35hz>40hz>45hz>50hz by V/F method.
i have connect output of h bridge direct to L-N terminal of motor.
my problem is motor start is delayed, when it start it vibrates and produce sound after reach 50hz motor vibrates too much.
during motor run time i check the output of h bridge output get distorted very badly. :-( without load output is fine
then i check 230 vac fan motor (which do not have capacitor) it runs fine.
any suggestion what is cause of malfunction :thinker: and how to overcome the problem