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Save money – install a frequency inverter

Every year, thousands of electric motors are installed to be driven directly from mains power and thus run at full speed, even when this is not necessary. This particularly applies to pump and fan operation, where regulation is often applied by throttling the amount of air.

If we look at the power needs of operating pumps and fans, it becomes apparent that even a small reduction in speed saves a lot of energy. However, motors that run in constant torque applications can also gain benefits from running at a lower speed.

Other advantages of using a frequency inverter are that starting and stopping are obviously gentler. All the mechanical parts thereby last much longer when undesirable jerking and shock-loading of the system are avoided.

Contact us for a cost evaluation for your application.

Energy saving with frequency inverters
Lower the speed – calculate the financial savings in cash!
Further savings
Mitsubishi Electrics frequency inverters make it possible for you to reduce operating costs even further.

Calculate how much energy you can save with frequency inverters

Select the load and specify the operating data
Type of load:
Rated motor power:  kW
Operating time per year:  hours
Cost of electricity per kWh:  euro
Average rotation requirement per year:  %
Investment cost for a frequency inverter:  euro
 
 
Calculated saving
Cost per year with shutter regulation:
Cost per year with a frequency inverter:


Savings per year:
Repayment period for your investment:

Contact us for a precise cost evaluation for your particular application!

Further savings

Mitsubishi Electrics frequency inverters make it possible for you to reduce operating costs even further.

Reduction of voltage at constant rotation speed

The frequency inverter reduces the voltage until the motor current begins to increase. The motor speed remains the same, while power consumption falls!

OEC - Optimised Excitation Control, is a further improvement to the motor operating conditions. Up to 10 % additional savings can be obtained with traditional U/F control!

Pump/Fan operation:
For a centrifugal pump/fan, agitator or centrifuge, the power consumption is proportional to the cube of the rotation speed (red curve). Reducing the speed by 20 % reduces the amount by the same proportion. The power is however reduced by 50 %.

Constant torque operation:
Graphical sketch showing that power consumption reduces linearly in relation to speed. Conveyor belts, machine tools and rollers are examples of constant torque operation. Here one also achieves a reduction in power, but in this case it is proportional to speed.