IP enclosures protection indexes
Indicates the degree of mechanical insulation of the motor body.
1st figure indicating level of protection against the penetration of solid bodies.
2nd figure: indicating degree to which the motor is waterproof.
2 |
Protected against solid matters (over Ø 12 mm). |
3 |
Protected against solid matters (over Ø 2,5 mm). |
4 |
Protected against solid matters (over Ø1 mm). |
0 |
No protection |
N.B.: Motor BL002 only with standard protection IP34 and IP30 IE.
Insulation class
Class |
Δ t °C
Ambient temperature: 40°C |
B |
90°C |
F |
115°C |
H |
140°C |
IEC duty cycle ratings
S1 |
Continuous duty. The motor works at a constant load for enough time to reach temperature equilibrium. |
S2 |
Short time duty. The motor works at a constant load, but not long enough to reach temperature equilibrium, and the rest periods are long enough for the motor to reach ambient temperature. |
S3 |
Intermittent periodic duty. Sequential, identical run and rest cycles with constant load. Temperature equilibrium is never reached.
Starting current has little effect on temperature rise. |
Key / Diagram Glossary
With a brushless motor, the rotational speed is a linear function of
the torque. In the same way, the absorbed current is also a linear
function of the torque. Speed and current change a lot against
applied torque.

The output power is calculated using the formula:
Pn [W]= Mn · S = 2π
60 · n1 · Mn

Since the supply voltage is constant, whereas the current increases
in a linear manner as the torque increases, the absorbed power
trend is a straight line going up. Efficiency is shown from the ratio
between the output power and the absorbed power.
Useful formulas
η =
Pn
Pa
Pa = V · I
Pn = V · I · η
Pn = Mn · Sv
Sv =
N1
9.55
[HP] · 746 = [W].
Example 2 HP = approx. 1500 W.
S |
- |
Duty |
Pn |
[W] |
Rated power |
Pa |
[W] |
Absorbed power |
Mn |
[Nm] |
Rated torque |
V |
[V] |
Voltage |
I |
[A] |
Absorbed current |
n1 |
[min-1] |
Motor speed |
Sv |
[rad/s] |
Angular speed |
IC |
- |
Thermal insulation class |
FF |
- |
Form factor |
IP |
- |
protection class |
η |
- |
Efficiency |
Kg |
- |
Weight |