RSS
Print pageHome » How do you correctly test the motor after repairing or overhauling?
How do you correctly test the motor after repairing or overhauling?
Q: How do you correctly test the motor after repairing or overhauling? Is there any fixed procedure for taking measurement value? When testing without load, everything is OK. But when I put the load/taking online with rotating equipment (example: pump), it becomes trip overload. Why did this happen?
A:
There are reliable acceptance tests that should be part of a company's repair specification. The simplest is to document the no-load amperage (NLA) of the electric motor operating at rated voltage. A rule of thumb is that most motors should draw approximately 1/3 of the rated full load current (FLA). There are exceptions -- motors that have very low running speeds, and 2-pole motors (3600 rpm on 60 Hz systems, or 3000 rpm on 50 Hz). Since most electric motors are 4-poles (1800 rpm at 60 Hz, or 1500 rpm at 50 Hz), this quick check offers a reasonable confirmation that nothing is drastically wrong.
More stringent tests cost more, but are justifiable for critical applications and locations where installation is difficult. Some service centers have a dynamometer, and can simulate the actual load conditions.
Here are more of the latest questions on: Motors Drives
How do you calculate the force of a moving fluid against an obstruction?
What is the torque required for motor selection? We have a water tank that is 4 ft. high, 2 ft. wide, 12 ft. long. The tank is divided vertically in two parts by a sheet. There is a gap of two feet on both ends of the tank separation plate. We want to install a paddle wheel of radius two feet on one gap. When it rotates the water it will be pushed to the bottom portion and will come out from the gap on the other side. How much torque will be required to rotate the paddle wheel if the blade size is 2 ft. by 2 ft. each and 3 blades will be in contact with water at the same time. The rpm required is 70.
How do you calculate torque requirements for a paddle wheel used to move water in a pond?
How do you calculate torque requirements for a paddle wheel used to move water in a pond? I need to know torque in order to size a motor and gear reducer for a paddle wheel.
How can I avoid smoking the motor at startup?
I have a 12.25-inch disk when loaded with components equals about 8 pounds. Others in the same field have a problem of smoking the motor during startup. I want to run at a variable speed to 3600 rpm.
It is important to keep the motor as small as possible, and long life and extremely low maintenance are important.
How can we increase the speed of an electric motor?
How can we increase the speed of an electric motor by a VFD system supplying energy to a pump? Suppose the motor power is sufficient enough to prevent overloading the motor?
What would be the power of 2950 rpm-VFD drive to yield 3650 rpm 90 kW output?
I need to supply 90 kW power and 3650 rpm for running a pump. The highest available electric motor would be 2950 rpm. I have to use a variable frequency drive (VFD)-motor system for raising the speed. What would be the power of 2950 rpm-VFD drive to yield 3650 rpm 90 kW output for the pump?
