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Motor and Frequncy

Created by: jeet2907 at: 5/29/2014 1:32 PM (14 Replies)

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5/29/2014 1:32 PM
jeet2907 Posts: 235 Rating: (52)	Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor?
jeet2907 Posts: 235 Rating: (52)
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5/29/2014 1:45 PM	Rate (2)
IBN-Service Posts: 8946 Rating: (999)	jeet2907 Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? This question was answered a lot of times here... Short and fast: Yes, you may increase frequency. You will lost torque if you can not increase voltage at same time. 50 Hz by 400 V => 60 Hz by 480 V => no Problem for motor. Torque remains, power increase.
IBN-Service Posts: 8946 Rating: (999)
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5/29/2014 3:18 PM	Rate (1)
N. Vijay Silver Member Joined: 3/17/2013 Last visit: 8/25/2024 Posts: 481 Rating: (43)	If it is not a VFD rated motor, you should take care of dyanmic balancing also. Other factors which will impact rising frequency above base value 1. If motor is already running near full load, it will not cope up with rise in frequency. Current limit acts 2. Connected equipment dyanamics also should be considered w.r.t increase in speed. As far as VFD is consideredno problem Regards, Vijay

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5/29/2014 5:09 PM	Rate (1)
Navnag Platinum Member Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	jeet2907 Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? jeet2907 Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? Besides the details provided byIBN-Serviceand N. Vijay, please also consider whether the Machanical design of the motor would permit this especially the Rotor and the Bearings., which mey not be designed for higher speed. Most motors have a Maximum rated Mechanical speed ( It is available from manufacturer, even if not given on the Name Plate ). If you Exceed the maximum mechanical speed of the motor, you risk damaging it Hope this helps Cheers Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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5/29/2014 5:45 PM
@nkur Posts: 202 Rating: (16)	IBN-Service jeet2907 Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? This question was answered a lot of times here... Short and fast: Yes, you may increase frequency. You will lost torque if you can not increase voltage at same time. 50 Hz by 400 V => 60 Hz by 480 V => no Problem for motor. Torque remains, power increase. Hi there Will it have any effect on the lifecycle of motor & its winding as it may be harmful??
@nkur Posts: 202 Rating: (16)	Last edited by: @nkur at: 5/29/2014 5:46 PM
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5/29/2014 8:17 PM	Rate (1)
aakash parashar Posts: 28 Rating: (4)	]Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? Hi, Have a look at 87 Hz curve in the attachment.Also have a watch on motor volatage rating Attachment Operating motors in the field-weakening range for MM440 and G120.pdf (1012 Downloads)
aakash parashar Posts: 28 Rating: (4)
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This contribution was helpful to 4 thankful Users IBN-Service Deleted User jeet2907 Er.digu

5/29/2014 11:57 PM	Rate (0)
kriipc Silver Member Joined: 4/11/2011 Last visit: 10/7/2024 Posts: 132 Rating: (7)	I have ca 6 roller conveyors running 100 Hz (0,5 kW motors). 6 years. Why they must run 100Hz ? Old equipment from another plant...
	I'm just a human. Mistakes are allowed. Sorry for my english. Only 3 months of training and manuals :)
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5/30/2014 12:13 AM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 6/29/2023 Posts: 508 Rating: (23)	If a motor designed for 50 Hz and you are running at higher frequency for a long time is the problem.

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5/30/2014 1:54 AM	Rate (1)
Deleted User Posts: 767 Rating: (69)	Hello Madhava, While not ideal in general terms, for many applications it may be very common to operate motor above its 50 Hz or 60 Hz. Details of the application may be that at higher speeds of operation the torque needed is less than at speeds below 50 Hz or 60 Hz. An example would be a winder application where at empty roll the motor needs torotate at maximum rpm to support line speed with little load torque, but at full roll motor needs to rotate at minimum speedproviding maximum amount of torque for the application. Best Regards, Deputy
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5/30/2014 5:36 AM	Rate (1)
Valli Posts: 262 Rating: (45)	@nkur IBN-Service jeet2907 Dear All, Can we run the Motor more than 50Hz if its maximum Frequency is only 50Hz using Drive?And if not then what is effect of higher frequency on motor? This question was answered a lot of times here... Short and fast: Yes, you may increase frequency. You will lost torque if you can not increase voltage at same time. 50 Hz by 400 V => 60 Hz by 480 V => no Problem for motor. Torque remains, power increase. Hi there Will it have any effect on the lifecycle of motor & its winding as it may be harmful?? Ofcourse... motor should be designed to for VFD operation. Some important notes to be kept in mind:- 1) Windings should be treated under Vaccum Impregnation method. Normal winding of motors are meant to operate on Sinusoidal current but due to VFD some pulsating DC componenets also gets superimpose over AC waves which result in Hot Spot on the windings and finally insultation failure. 2) from280 Frame above NDE Bearings should be insultated to avoid circulating current. 3) for protection pupose use ACH and PTC/ BTD also.
Valli Posts: 262 Rating: (45)
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