Mechatronics

Excellent Relation Between Maximum And Ratedtorque

The FUKUTA servomotor enables a high relation between peak and rated current so produces high rates of maximum torque. Further more the servomotor presents an extremely perfect relation between torque and volume /weight which permits compact application and best use of available space.

Sturdy & Simple Construction Not Requiring Maintenance

Since the FUKUTA servomotor do not have permanet magnets ,there no risk of demagentization of breakage due to fragility from vibration or impacts, especially for the servomotor used on moving machines. Moreover, the position of magent poles are unnecessary to be detected for driven because the direction of magnetic flux is determine by the voltage. The use of encoder sets on the motor shaft feedback for controlling of the speed and position with accurany. The sturcture, therefore, is extermaly simple, sturdy & reliable and does not requir any maintenance, since there are no collectors, brushes or magents.

Housing

The housing is built according to advanced criteria and technology. Futher to the compact size and lighter weight, these servomotor offer an outstanding mechnical accuracy and sturdiness. The housings are made of extrusion and die cast aluminum for motor frame sizes up to 132. The body is a squre. It is provided with internal ventilation channels in order to ensure a high thermal dissipation and to reduce vibration.

Protection

All the servomotors are built in IP23/IP54 protection. Superior grades can be supplied on request.

Winding

With a double layer of shorted pitch, it determines advantages in the FEm cure due to the effect of elimination of some of the harmonic and damping of others. The structure of FUKUTA servomotors adopts H class insulation and supports the thermal, electrodynamical stress and inrushing current that is supplied by the inverter. The choice of these materials and the method of soak permit using the servomotors in a tropical. climate with considerable thermal amplitudes at high humidity degrees. Special treatment for very corrosive ambience can be supplied on request.

Construction Form

The servomotors are built according to construction feature is shown in the chart in conformity with IEC 34-7 and CEI 2-14 n. 724 publication.

Rotor

The rotor is of die-cast aluminium design and has been lightened so to reduce the rotor inertia to a minimum. The rotor consists of a cage with inclination, a number of slots and a suitable shape to enable perfect operation also at very low speed and to reduce the temperature on surface layers and furthermore avoid cogging torque.

Balancing

Balancing is carried out dynamically with an integer key according to iso 2373 grade R to suppress vibration also at high speed. On request, for special applications balancing according to grade S can be carried out.

Bearings

The ball type bearing is suitable for high speed and lubricated with special greases that offer the best response to high speed and temperature.

Thermal Protections

The servomotors are provided with a thermal protection by means of 1 metallic double slices thermal switch, which are connected in series and incorporated in the windings. The contact is normally closed (NC), and it opens when the temperature of the windings reaches a temperature which is dangerous for the insulating system.

Ventilation

Ventilation is obtained by an auxiliary electronic fan which generates a constant air flow and independent of the speed of the servomotors. This ensures an excellent cooling in any operating condition. In this way, low peak current servomotors can be chosen. Even at low speed, it still can offer a wide constant torque range without reducing the duty cycle.

Encoder

The standard configration provides a bollow shaft and is housed in an approproate aluminum case to ensure strong mechnical protection. As to the electrical connection. a 10-PIN connector is used.