Motor Torque at low frequency
Motor Torque at low frequency
(OP)
I work at a fruit processing plant and need some information on a conveyor system that we have installed. Currently we have a motor turning a 10' by 4' wide conveyor that handles massive loads at time by dumping of product. Because of grading and so on, the line supervisor adjusts the remote speed pot dial down as far as she can. Which in turn she is operating the frequency drive somewhere around 11-15hertz. We have been having a problem depending on the load of stalling out the motor but not recieving a fault from the drive. When testing and we operate the motor at full 50cycles (european equipment) it is not possible to stall the motor. This motor operates a chain drivin sprocket connected to the conver. My thoughts are re-gearing the motor sprocket so we can raise the frequency and run the motor faster providing more torque. Thanks any input will be appreciated.
Reilly
Reilly





RE: Motor Torque at low frequency
RE: Motor Torque at low frequency
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Motor Torque at low frequency
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Motor Torque at low frequency
Im currently looking up information now as well. Thanks for the information.
RE: Motor Torque at low frequency
RE: Motor Torque at low frequency
Two parameters : F5 V/F Pattern
F13 Torque Compensation
The problem you describe would seem to be that you are not developing the excitation in the motor necessary to support the torque load in the lower operating range (below 30% in your case)
What is F 5 setting
What is F13 setting
What is output voltage at 10, 11,12,13,14,15,16 hz
What is current at those points both for unloaded and loaded conditions.
If F5 is set correctly .... you can increase torque support by increasing F13 parameter .... watch the current as you increase this parameter. You do not want to exceed rated Inverter current by more than 5 - 8% under transient conditions... ie. when shock load is applied.
RE: Motor Torque at low frequency
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Motor Torque at low frequency
jraef:
you know the story. OEM's always buy on price. It would seem that this may have been the case and as a consequence, the inverter is not well suited for the application. Then again, it might be adequate but just not properly set-up OR the operation thereof is exceeding the design limits. Not unfamiliar scenarios for you.
Quality is like Buying Oats:
If you want nice fresh oats you have to pay a fair price. If you can be satisfied with oats that have already been thru the horse, that comes a little cheaper.
RE: Motor Torque at low frequency
RE: Motor Torque at low frequency
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(2B)+(2B)' ?
RE: Motor Torque at low frequency
Love the "oats" reference too by the way ScusaMe.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Motor Torque at low frequency
You can change the drive and get more torque from the motor. However, you might also overheat the motor by doing so.