There are a
variety of reasons why geared motor units fail so it is wise to have a good understanding
of them all to better diagnose any recurring problems you have with failing
avoided reasons for failure are a lack of proper lubricant and inadequate
mounting, so make sure you know what oil or grease is required for the specific
motor and ensure the mounting is stable and secure.
Now we will briefly
touch on the other issues that cause failure but which are less easy to detect.
One of the most
common reasons for failure is a geared motor unit being undersized and thus
doesn’t produce enough power for the application. This results in the motor overheating.
The overheating can be difficult to notice before failure if you cannot feel
the heat, especially if you are not regularly checking the temperature.
motor units have to work harder than they are designed for and thus burn out
much faster than a adequately sized motor. Usually these instances result in a permanent
and unrecoverable failure and the motor must be replaced.
and overheating motor will also compromise the lubrication oil. When the temperature of the lubrication oil
rises too high, it begins to break down thermally, leading to failure. When
this happens you might be able to smell the oil or see paint discoloration on
Excessive Overhung Loading
The radial load
on the shaft can badly damage bearing support systems, a problem known as
excessive overhung overload. Overloaded shafts suffer from shaft fatigue which leads
to failure and may require a gearbox repair service as
provided with a free inspection and report by gearboxes suppliers such as YB
that high thrust forces on shafts can exceed their bearing capabilities, which
then compromises the press fits of the various components. These high thrust
forces can exceed the structural housing strengths of the application’s
components, leading to failure.
Gear Tooth Fractures
The teeth of a
gear can be fractured when gearboxes experience shock loads from large inertia
loads. It can also happen when excessive acceleration or deceleration of the
loads occurs, fracturing the gear teeth and causing failure of the application.
torsional loadings have a similar effect, especially when the excessive
torsional load occurs at a keyway or cross-hole.
Unprotected Gear Motors
units operating in environments that interfere with their operations need to be
protected from the effects of the environment. Dirt and extreme temperatures
are the main culprits, so make sure any gearboxes operating in these
environments are covered correctly.
motors will show signs of stress on the gearbox sealing package and will often
suffer problems with the lubrication oil. Another common issue caused by a lack
of protection is poor heat dissipation, so always
ensure the gear motors are protected from environmental interference.
will need to be monitored because another problem that causes failure is
excessive condensation, which occurs if the geared motor unit is subjected to
thermal cycling. Keeping the gear motor totally enclosed and protected in this
situation can cause failure due to the build-up of condensation, so make sure
to regularly vent the application and the motors driving it.
If you require any gear
motors or geared motor units then contact
who are the UK’s leading gearboxes suppliers.