Calculator

Roller operating point

Horizontal driven roller or drum. Calculates n, F, T and P. No catalog selection and no type code. g = 9.81 m/s².

Conveyor speed

Unit

Roller diameter (mm)

Mass (kg)

Duty

Advanced (η, f_b, μ, a)

Efficiency η

Service factor f_b

μ (override)Acceleration a (m/s²)

Default η = 0.85 and f_b = 1.2. Acceleration is off (a = 0). For hoisting, μ does not count. η = 0.85 fits a parallel-shaft or bevel-helical reducer; a worm reducer is often lower (η ≈ 0.5–0.85, depending on the ratio) — adjust η once the reducer family is known.

typically F (parallel shaft) or K (bevel-helical). 4-pole 50 Hz is a family indication, not a measured speed.

n_rol: 95,5 RPM
F: 147 N
T (roller shaft, no f_b): 7,36 Nm
P_as: 0,074 kW
P_motor: 0,104 kW
IEC 60034: 0,12 kW
i (4-pole 50 Hz): ≈ 15,2
Gearbox family: typically F (parallel shaft) or K (bevel-helical)

T is the bare shaft torque (F · D/2), without the service factor f_b. P_motor already has f_b applied. When sizing a reducer on output torque: use T × f_b = 8,83 Nm, not the bare T.

Does the driven shaft section carry this torque? Pass it into a first pure-torsion check and choose a justified allowable shear stress there for the material and application; peak load, bending, fatigue and keyways remain outside that check.

Check shaft at calculated torque →

Duty formulas

SI internally. n_rol = v / (π D), T = F · D/2, P_as = F · v, P_motor = P_as / η · f_b. Optionally + m a.

Duty	F	μ default	Family
Roller conveyor	m g μ	0,03	typically F (parallel shaft) or K (bevel-helical)
Belt	m g μ	0,10	typically F (parallel shaft) or K (bevel-helical)
Incline	m g (μ cos(α) + sin(α))	0,03	F or K
Hoisting	m g	—	often R or K

Source for μ defaults: Engineering ToolBox — rolling resistance. Indicative values, not a standard table — measure or check with the manufacturer for critical drives.

IEC 60034 kW steps

P (kW)
0,12	next step
0,18
0,25
0,37
0,55
0,75
1,1
1,5
2,2
3
4
5,5
7,5
11
15
18,5
22
30
37
45
55
75
90
110
132
160
200
250
315

Source: IEC 60034-1 (preferred power ratings, R20 series).

Loading calculation model…

Questions

What is in P_motor?+

P_motor = P_shaft / η × f_b. η is drivetrain efficiency (default 0.85), f_b the service factor (default 1.2). P_shaft is F·v at the roller, in watts.

What is the IEC step?+

The next catalogue value from the IEC 60034 kW series, not the calculated shaft power. 0.104 kW becomes 0.12 kW. Above 315 kW there is no step in this series.

Does this pick a motor type?+

No. This calculator only finds the operating point: n, F, T and P. No type code, no stock pick.

What is i ≈ 1450 / n?+

A family indication for a 4-pole motor at 50 Hz (synchronous 1500, full load around 1450 min⁻¹). Not a measured speed.

Motor sizing

Roller operating point

Duty formulas

IEC 60034 kW steps

Questions

Roller operating point

Duty formulas

IEC 60034 kW steps