Motors with Integrated Inverter.
SMI series consists of three-phase asynchronous electric motors with integrated frequency inverter. Power
range is between 0,37 kW and 15,0 kW while the motor frame is from 71 up to 160. The unit is made up of a
high-efficiency 3-phase asynchronous electric motor and a compact frequency inverter placed at the nondrive
motor end. The basic construction is closed, fan cooled and IP 55 enclosure duty. SMI motor is able to
properly run also under heavy overload conditions thanks to high thermal reserve; the insulating materials
are class F. The frame is made of aluminium alloy up to 132 frame size and of cast iron for above sizes. Shields
and flanges are made of aluminium up to 90 frame size and of cast iron up to 160 frame size. The inverter
housing is isolated from the motor in order to avoid heat transmission (patented system); the inverter dissipator
is self-ventilated. The frequency converter provided is one of the most advanced in design concept as
well as used components; control can be chosen between V/F type (frequency voltage control) or SLV type
(sensor less vector control). SMI motors are easy to be programmed using only three buttons. Some functions,
which automatically set parameters (acceleration/deceleration times, V/f ratio etc.), make the programming
easier. On request, motor can be arranged for main Bus fields (Profibus, Interbus-S, Device-Net, etc.).
SMI motors are designed to be real built-in frequency converter motors and not just as a simple assembly
of a standard motor with an inverter. The wiring connection is definitely simple to be made. All the above
features make the SMI motor series high performance with strong structure.
Application
SMI series represents an innovation in the automation
field and it gives manufacturers, automation designer and
machinery users new opportunities and great economical advantages. The ease of installation, the simple
structure and the cost-effectiveness of the system are pointed out as follows:
- Overall dimensions are extremely reduced; the couplings are the same as those of a standard motor
(special flanges and shafts can be supplied on request);
- Enclosure is IP 55 as standard;
- Electrical connections are extremely simplified; power and control parts are totally separated and placed
on different terminal boards;
- On request, motor can be equipped with built-in EMI filter (class A or B) in the way to avoid an external
filter application; the motor connection can be carried out through normal power supply cables, as shielded
cables are no longer necessary in order to comply with EMC regulations;
- SMI series motor can immediately replace a mechanical speed variator, offering more advantages;
- The system performance is very high in every operating condition;
- Unit switchboard on which SMI motor is installed can be removed or reduced as the inverter has no longer
to be housed.
SMI motor represents the solution to the actual needs related to automation systems where actuating and
surveying devices can find more places on unit board so to reduce the panel overall dimensions and the
wiring costs.
SMI SERIES