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Easy Retrofit

- for all frame sizes
The EC+ concept is based on standardised components that the user can replace individually. It
allows PM motors with IEC dimensions to be used with Danfoss VLT® frequency converters.

By using motors in standard designs the user benefits not only from the free choice between PM
and TPIM motors, he still benefits from the option of choosing an independent motor manufacturer. 

More about Manufacturer Independence
 
Today, three-phase induction motors (TPIM) with standardised mounting dimensions and frame sizes
specified in IEC EN 50487 or IEC 72 are used in many applications. Exchanging them with newer
motors with the same design and size is possible without problems, also in future. The introduction
of minimum efficiency levels (see Legislation-> MEPS) for TPIMs will not present problems either.
Although some IE2 motors are built bigger than older motors, they usually keep the connection
measurements. Together with a converter, this combination also meets the required conditions after
2017. 

More about Legislation
 
However, most PM motors have been based on different designs. Servo motors are a typical example.
With their compact design and long rotors, they are optimised for highly dynamic processes.
To allow the high efficiency of permanently excited motors to be utilised in existing systems, PM
motors with standard IEC frame sizes are now also available. This allows older-model standard
three-phase induction motors to be replaced by more efficient motors in existing systems.
 
 
There are essentially two
types of PM motor with
IEC dimensions currently
available.

Option 1:
PM/EC and TPIM have the same
frame size.
Example:
A 3 kW TPIM can be replaced by
an EC/PM motor of the same size.
 
Option 2:
Optimised frame size PM/EC and
TPIM have the same rated power.
Since PMSM motors are usually
more compact than TPIMs with
the same rated power, a smaller
IEC frame size is used than for
the TPIM.
Example:
A 3 kW TPIM can be replaced by
an EC/PM motor with the frame
size of a 1.5 kW TPIM motor.








                                                        Dimensional comparison of a standard three-phase induction
                                                        motor (below)and an optimised PM motor (above)
Danfoss VLT drives energy saving ECplus

Danfoss EC+ Concept

Systematic energy saving

Increase your overall system efficiency, achieve a higher energy class certification and save costs with the Danfoss EC+ concept.