The DLT measurement for DC motors allows in a few seconds (normally from 3 to 5 seconds) to obtain masses characteristics of the DC motor under test.
More in detail, the engine behavior is analyzed through a high-speed sampling device during the 4 distinct phases of testing which normally take place between 3 and 5 seconds. In particular:
1. Acceleration phase (first 200-300ms). The data acquired in this phase generate the following results:
-
peak current (related to the locked rotor current)
- if option 320 / SR is present, the direction of rotation of the motor. This acquisition requires a special sensor supplied by e.d.c .. to be approached at a distance between 2-4mm
2. Static phase: corresponds to the phase in which the engine has reached a constant speed, therefore it depends on the type and size of the engine being tested. Generally it is reached after 0.5-2 seconds from the application of the voltage. During this phase we measure:
- No-load rotation speed: this measurement is carried out by analyzing the current signal for which no external sensor is required
- No-load current
- Electrical power absorbed
3. Generative phase: during this phase, which occurs as soon as the supply voltage is removed, the motor acts as a generator. Through the analysis of the voltage and current generated in this phase we obtain:
- Current Curve Vs Torque
- Speed curve Vs Torque
- Efficiency curve Vs Torque
In addition to giving the possibility of displaying the various curves, the software allows you to set any number of control points. In each point you can set:
-
Rated torque
- Minimum and maximum acceptable speed
- Minimum and maximum acceptable current.
Alternatively, you can also set:
-
Rated speed
- Minimum and maximum acceptable torque
- Minimum and maximum acceptable current
4. Deceleration phase: during this phase the motor decelerates. The deceleration will take place at a time depending on the overall friction of the engine itself. During this phase the deceleration time is acquired.
The cycle time is normally less than 5 seconds.