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Post by clyevo on Apr 15, 2015 3:21:40 GMT
This question are relevant for using 3 phase AC motor. In my country, Malaysia the single phase is 240v and the three phase is 415v
1) Three phase power is expensive to install. Is there any advantage of using 3 phase power supply instead of the usual domestic single phase (power saving and heat issues)? I am aware there are inverters that can convert single phase into 3 phase.
2) I found 3-phase motor sold locally (malaysia) uses 380v (imported from china). Can these motors be used with WJ200-007SF (Input: 230VAC, Single Phase/ Output: 230VAC, Three Phase ). In other words is allright to undervoltage them or do i need to find an inverter with matching voltage output.
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Post by Mitch on Apr 15, 2015 8:49:46 GMT
This question are relevant for using 3 phase AC motor. In my country, Malaysia the single phase is 240v and the three phase is 415v 1) Three phase power is expensive to install. Is there any advantage of using 3 phase power supply instead of the usual domestic single phase (power saving and heat issues)? I am aware there are inverters that can convert single phase into 3 phase. 2) I found 3-phase motor sold locally (malaysia) uses 380v (imported from china). Can these motors be used with WJ200-007SF (Input: 230VAC, Single Phase/ Output: 230VAC, Three Phase ). In other words is allright to undervoltage them or do i need to find an inverter with matching voltage output. Hi clyevo - 1 - As far as I know, not really. Three phase probably rectifies into smoother DC? Also per unit the WJ200-007HF inverter (400v 3ph input) is more expensive than the 007SF. 2 - www.gohz.com/star-delta-motor-connection-380v-220v maybe Thanos can comment on this more. Here are some other resources. www.hitachi-america.us/supportingdocs/forbus/inverters/Support/WJ200_Instruction_NT325X.pdfwww.hitachi-america.us/ice/inverters/support_service_sales/support/dload.html
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Post by clyevo on Apr 15, 2015 10:40:00 GMT
1) I mean that 3 phase are not availaible by default at domestic area. I have to pay additional charge for the cables to bring 3 phase into the area. 2) www.gohz.com/star-delta-motor-connection-380v-220v Quoted from article= "If the motor is rated at 380V - 'delta connected' then it could be connected in star or delta as connecting a 380V delta rated motor in star will reduce the voltage across the windings to 220V which is OK and often used in Star/Delta starting to reduce start up current. Of Couse all 6 motor windings must be accessible. As stated above, you can take a 380v, 3 phase star connected motor and run it as a 220v, three phase delta connected motor."
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Post by tronicgr on Apr 15, 2015 14:09:39 GMT
You don't need 3phase vfd inverter input to run 3phase motor. You can use 1phase input vfd to 3phase motor as everyone here does.
The motor specs show what torque you get for 220v as well.
Thanks Thanos
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Post by clyevo on Apr 16, 2015 1:34:50 GMT
You don't need 3phase vfd inverter input to run 3phase motor. You can use 1phase input vfd to 3phase motor as everyone here does. The motor specs show what torque you get for 220v as well. Thanks Thanos How is the efficiency comparison of 3 phase instead of converting single phase to 3 phase in term of power consumption? Is it negligible? Also does it has any relation with the noise that the inverter make during operation? If i run the motor at lower voltage than rated, how much less torque, i suspect its unlikely to be of linear correlation. I cant seem to find the specification sheet from the supplier, this is quite typical for china imported goods. I do see some AC motor display two voltage such as 220v/380v next to the model name. But not the one i am looking to buy so i am quite skeptical about this particular motor.
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