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service factor, electric motors, DC motors, stepper motors, servo motors, vibromotors, frequency inverters, cooling fans, worm gearboxes, helical gearboxes, planetary gearboxes

Varvel, Nord, Siti, Watt Drive, Bonfiglioli, Motovario, Spaggiari, Chiaravalli, CHT, Leeson, VEM, Baldor, Lenze, Hydro-mec, Lafert, ICME Motors, WEG, Teco, MGM, SEW, Transtecno, ATB, Bartec, A:O:Smith, Heidolph, Elin Ebg, Siemens, Leroy Somer, Bison, Marelli Motori, Orientalmotor, SPG, Faulhaber, Kelvin, Unimec, Crouzet, THK, Magnetic, Cemp, Carpanelli, Bühler, Piemme

In simple terms, an electric motor is a machine which converts electrical energy into mechanical energy. The basic operating principle of any electric motor derives from a physical law which determines that, when current flows through a conductor located inside a magnetic field, it is subjected to a force which is proportional to the intensity of the current and the field. With D.C. motors, the magnetic field can be created by permanent magnets placed inside the motor or by auxiliary windings through which the current flows and which function as electro-magnets. Our motors use the first of these solutions offering the following advantages:

• they do not require an auxiliary power supply with the advantage that the batteries will last longer • the motor is more efficient and is less likely to overheat • fewer terminals in the terminal box Thermal insulation class

The windings of the rotor can overheat just like other parts of the motor too. The degree of insulation indicates the maximum allowable temperature above which the insulation of the windings, as well as that of all the parts which heat up to a high temperature, loses its insulating properties and the motor therefore risks being damaged.

IEC

International Electro-technical Commission. International body for regulating and unifying electro-technical standards. The decisions taken by this body represent an opinion usually accepted by all nations throughout the world.

Efficiency .

Relationship between the output power Pn and the absorbed electric power Pa:

.
=Pn/Pa Pa=Pn PD The dissipated power PD is the power required to overcome the mechanical friction of the motor and the electrical dissipation in the windings. This produces heat which increases the temperature of the motor. The increase in temperature depends on the amount of heat generated (dissipated power) and how difficult it is to transmit this heat to the surrounding environment (heat resistance). The ambient temperature affects the level of heat resistance. Duty cycle

This represents the relationship between the time the motor operates and the time it remains stationary. Continuous operation (S1) = the motor operates non-stop under full load.

Intermittent operation (S2, S3, etc.) = alternating periods of work and rest so that the motor can cool down. The output power for continuous operation is lower than that for intermittent operation.

Form factor

Indicates how much spurious alternating current is present in the D.C. motor power supply. The higher the factor, the lower the motor's efficiency. SCR power supplies = F.F 1.40. Battery supply = FF 1 Transistor supply (PWM modulation) = FF

1.05.

The graph below indicates the torque trend (percentage) in relation to the form factor.

1 1,2 1,4 1,6 1,8 2 FF