In the first Cartesian dial are shown the **Torque, in [Nm]** (X axis), the **rotation speed, in [Rpm]** (Y1 axis), the **current consumption in [A]** (Y2 axis), the **efficiency** (Y3 axis).

For completeness, only in this graph, is represented also the output power curve in[W] (Y4 axis). In the technical data sheets the output power curve is not present.

Continuous functioning area

S_{1}

Nominal tension

V_{n} [V]

Supply tension

No load speed

n_{0} [Rpm]

Motor's speed with no load applied

No load current

I_{0} [A]

Current absorbed by the motor with no load applied

Nominal speed

η_{N} [Rpm]

Minimum speed to which the motor can run continuously

Nominal torque

M_{N }[Nm ]

Maximum torque to which the motor can run continuously

Nominal current

I_{n} [A]

Maximum current to which the motor can run continuously

Stall torque

M_{s} [Nm]

Torque with blocked rotor

Stall current

I_{s} [A]

Current with blocked rotor

Maximum power

P_{max} [W]

The maximum power the motor can supply

Maximum efficiency

η_{max}

Maximum value of the relation between produced power and supplied power (C*ω)/ (V*I) that is [Nm*rad *s^(-1)]/ [V*A].

To each Torque value corresponds a value of current and speed. Every point, corresponding to a specific load is located on an ideal, vertical line starting from the torque value on the “x” axis.

In the chart is then defined an area called “continuous working area” which encloses all the working condition up to the line defining the nominal values.

The nominal working load is the last one, in ascending order of applied load, to which the motor can work continuously without being damaged. The nominal values written in the technical data sheets are indicative values and to homologate a product it’s necessary to run a life test.

About the life of a **Dc motor** or a **DC gear motor**, there are no parameter to define with precision how long can run a motor under a specific load and with a certain duty cycle. Every application has in fact their peculiarities, like mechanical friction, peaking, special environmental conditions, which can condition also strongly the brushes life.

Unless otherwise specified, it must be considered as tolerance for the speed, the area between two lines, parallel to the speed line, drawn from the values of +/- 10% of the no load speed.

For the current, it must be considered a tolerance of +/- 10% of each current value.

These tolerances are applied when the motor is “cold" (20°C).

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