Rated Power: it is the mechanical power measured at the shaft expressed, according to the latest indications of international Standards Committees, in Watts or Kwatts. However, in the engineering sector it is still common to refer to power in terms of HP		PERFORMANCE CHARTS   >> 2 (IE1+IE2) poles synchronous speed 3000 rpm   >> 4 (IE1+IE2) poles synchronous speed 1500 rpm   >> 6 (IE1+IE2) poles synchronous speed 1000 rpm   >> 8 poles synchronous speed 750 rpm   >> EFF.1 IE2+IE3 Remark: All charts are in PDF format. To view and prin them, you need Acrobat Reader:
	Rated Voltage: the voltage to be applied to the motor terminals in accordance with the specifications in the following tables
	Frequency: All electrical data in this catalogue refer to three-phase wound motors at 50 Hz. These may be connected to 60 Hz, taking into account the multiplier coefficients in the table below
	Rated Current: “In” is the Rated Current, expressed in Ampere, absorbed by the motor when supplied at Rated Voltage Vn (V) and giving the Rated Power Pn (W) and it is obtained by the formula In the following tables, the rated currents are referred to a Voltage supply of 400V. For other voltage supplies the absorbed rated current can be considered inversely proportional to the voltage supply. EX: motive motors can face also temporary overloads, with Current increases of 1.5 times the rated current for at least 2 minutes.
	Starting current (or locked rotor current): (you see diagram)
	Synchronous speed: is expressed in rpm and it is obtained by the formula f 120/p f= supply frequency Hz p= number of poles pairs
	Rated torque: Cn is expressed in Nm, and it corresponds to the rated power and rated rpm. It is given by the multiplication of the force for the arm (distance) and it is measured in Nm because the force is expressed in in Newton and the distance in metres. The rated torque value is obtained by the formula      Cn (Nm) =Pn x 9,550 / rpm      Pn= Rated power in KW      rpm= rated rotation speed
	Starting torque (or locked rotor torque): Cs is the torque that the motor can provide with the rotor at a standstill and the rated power supply.
	Maximum torque: Cmax is the maximum torque developed by the motor at the rated power supply, at a certain speed. It represents also the value of the resistant torque after which the motor stops. In the following performance charts, it is indicated the relation between maximum torque and rated torque and maximum torque
	Efficiency: is expressed in % and it is given by the relation between the output Power and the addition of output Power and the electric losses of the motor, that is the input power absorbed by the motor. The electric motors losses are mainly of two kinds: for joule effect (rotor and stator) and iron losses. The latest cause essentially heat. An higher efficiency means energy savings, lower heating, longer life of insulating materials. The smaller a motor is, the more the presence of a double lip oil seal as the ones used on the drive end of Delphi flanged motors (B5 or B14) may affect, following the friction generated, performance. The motors B3 up to size 132, however, have V-rings with an almost non existent level of friction. For simplicity, the following performance tables indicate the levels of absorption and performance measured on B14 motors for size 56 and B3 motors for size 63 and above.
	The temperature rise "T" is the change in temperature of the entire winding of the motor, including the wire placed deep inside the stator slots, when it is being operated at full load. For example: if a motor is located in a room with a temperature of 40°C, and then is started and operated continuously at the rated power, the winding temperature would rise from 40°C to a higher temperature. The difference between its starting temperature and the final inner elevated temperature, is the T. Almost all our motors are designed to offer a temperature rise of B class or even lower, while their insulation system is min in F class. This extra margin gives the motor a "life bonus". As a rule of thumb, insulation life will be doubled for each 10 degrees of unused insulation temperature capability. The most common method of measuring the temperature rise of a motor is based on the differences between the cold and hot ohmic resistance of the winding. The formula is: R1 = Cold winding resistence in Ohms (just before that the test begins) R2= Hot winding resistance in Ohms (when the motor has reached its thermal equilibrium) T1= ambient temperature in °C when test begins T2= ambient temperature in °C when test is stopped To change T from Centigrade to Fahrenheit: °C (T) x 1.8 Note: The motor surface temperature will never exceeed the internal temperature of the motor, and will depend upon the design and cooling arrangements.
	Power factor or cos: it represents the cos of the voltage and current gap angle.
	Noise: The noise is expressed in dB(A). The measures must be taken in accordance with the standard ISO 1680-2, in order to find the Sound Power level LwA measured at 1m of distance from the perimeter of the machine. EN 60034-9 standard describes the acoustic Power limits to be respected, indicating the maximum sound power level LwA. The noise values indicated in the performance charts that follow are referred to a no-load motor working, supplied at 50Hz and with a tolerance of +3 dB(A).
	The moment of inertia can be calculated in this way: J = (1/2) x M x (R2) Where M [Kg] is the rotation mass, while R [m] is the ray of the volume at cylindrical symmetry.
TOLERANCES
The data of each motor are specified in this catalogue like requested by the norm IEC 34-1. This describes, in particular, the following tolerances: The test reports on which the performance charts are based can be downloaded from The tests