Category: Motors

3 Easy Steps to stop Bearing Current Failures with Drives

How to deal with persistent bearing currents On rare occasions, operators in the process industry may note that their low voltage motors experience a current flowing through the motor bearings, especially when they are used with a variable speed drive (VSD). Left unchecked, these bearing currents will inevitably result in premature failure. Two new approaches can eliminate …

Continue reading

How to know if you set the correct current on a motor thermal overload relay

Start with full-load current… The full-load current at a given voltage indicated on the nameplate is normative for setting the overload relay. Because of the variable voltages around the world, motors for pumps are made to be used at both 50 Hz and 60 Hz in a wide voltage range. Therefore, a current range is …

Continue reading

Practical tips on how not to burnout an electric motor

Motor heating There are many reasons why an electric motor could start heating up. For example, when another starting duty is used than the informed one on the motor nameplate this may result in motor overheating and consequent motor damage. Due to high starting currents on electric induction motors, the time required to accelerate high …

Continue reading

Quantum Controls – the fourth Emergency Service?

Obviously, we say this with tongue in cheek! As important as our services are to UK manufacturing, when our engineers are called upon it is not a matter of life or death. The ladies and gents of the police, fire and health services deserve all the recognition they get (and much better salaries in our …

Continue reading

Snow doesn’t beat Quantum, the right vehicle for the job saves the day!

Earlier this week Quantum Controls took a call from a cable manufacturer who had a DC motor failure within his production line, and the extreme weather conditions meant getting through the snow to site was difficult – but our 4 x 4 vehicles meant our engineers were still mobile. The motor had already failed three …

Continue reading

What are the common effects of harmonic distortion?

The distortion in the waveform in the load current of any nonlinear device causes similar changes in the voltage waveform relative to the harmonic impedance of the source network. This voltage distortion affects both the current and voltage for all other loads connected to that system. The common effects of such harmonic distortion are as …

Continue reading

What are the 10 different duty types (load cycle) of three-phase asynchronous motors?

Motor Duty / Load Cycle The term duty defines the load cycle to which the machine is subjected, including, if applicable, starting, electric braking, no-load and rest de-energized periods, including their durations and sequence in time. Duty considered as a generic term, for example, can be classified as continuous duty, short-time duty or periodic duty. …

Continue reading

What are the top safety tips for electrical engineers?

Seven steps that save lives// While we usually focus our weekly technical releases on practical assistance for today’s engineers, nothing is more important than understanding how to work safely. As an example of electrical safety procedures, we will discuss the safe working procedures used by HV field technicians – the ‘Seven steps that save lives‘. …

Continue reading

How do I select induction motors for industrial applications? (Part 3)

Design Considerations (cont.) Different Rotor Classes// The different rotor class, i.e. KL7, KL10, KL13, KL16, KLp, etc. are available in case of the motor to fulfil the functional torque requirements of the driven equipment. The rotor classes indicate against what quantum of the load torque the motor would be able to start easily. The motor …

Continue reading

How do I select induction motors for industrial applications? (Part 2)

Design Considerations (cont.) Motor Efficiency// The new IEC 60034-30 motor efficiency standard could have major energy-saving impact for industrial motors worldwide. Though standard motors are now available with a better efficiency, this factor (motor efficency) requires due attention when making the selection of the motor for a specific application in view of substantial quantum of …

Continue reading