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Your product is portable tool and classified as Class B in EN61000-3-2. The corresponding limits should be 1.5 x Table 1 (Class A limit). Hence, it is rarely failed in the harmonic tests because the symmetric control is normally used.& B) r) a9 Q2 z: f+ b% ~
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In view of your data, your speed control is most likely using the TRIAC to change the Fire Angle. And, the motor is fairly high power. Otherwise, the 2nd and 4th harmonics should not be as high as yours. If that is the case, your supplier is correct that the harmonic problems are difficult to be solved in the circuit design. $ b$ ~/ a# g3 y1 n* ]/ l
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As my motor-driven product is usually of low power type, I also not sure whether my suggestion is workable or not. Perhaps, you may consider + r% B( N- u" j- ]6 ?+ d% ]# X& m
- changing your motor to be a less power one, or+ }" M1 S* _1 J/ n4 T7 v$ ]
- change the control method from Fire-angle control to PWM control
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Hopefully, it may help. |
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发表于 2010-8-20 09:27
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