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 Jan 25 2010, 10:17 PM
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#1
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 Group: Members Posts: 1 Joined: 25-January 10 Member No.: 7,618  |
I have the following application:
Motor: 300Hp/2000V/40A/60Hz VSD: 520KVA@480V Power Supply: 50Hz/380V What is the maximum frequency I can run the motor ? |
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Jan 29 2010, 11:27 PM
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#2
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Member Group: Full Member Posts: 78 Joined: 13-June 09 Member No.: 5,502 |
QUOTE (Cesar @ Jan 25 2010, 11:17 PM)  I have the following application: Motor: 300Hp/2000V/40A/60Hz VSD: 520KVA@480V Power Supply: 50Hz/380V What is the maximum frequency I can run the motor ? Hello. Maybe 100? Only 2 questions: Where 2000 V will be taken from? What the 480V VSD will be doing in the application ? |
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Jan 30 2010, 07:18 AM
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#3
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello Cesar
The maximum frequency that you can run the motor is dependent on two major considerations. 1. The maximum speed that the bearings can operate at. Check with the motor manufacturer or bearing supplier. 2. The speed torque curve of the driven load. As you change the frequency, you change the power capacity of the motor. At frequencies below the rated frequency of the motor, the voltage applied to the motor must be reduced proportional to the frequency reduction. This results in constant torque below rated frequency and ad power is torque times speed, the power capacity of the motor reduces with reducing frequency. Above rated frequency, it is normal for the voltage to be limited to rated voltage by the magnitude of the supply voltage. This reduces the flux in the iron as the frequency is increased and reduces the torque output of the motor. bove rated frequency, the motor can deliver rated power. As the speed of the load is increased, the torque required to drive the load typically increases. The maximum frequency may be limited by the torque requirement of the load and the torque capacity of the motor. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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