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Since there is no rotation slip (rotor at standstill) s=1, which gives us the following equivalent circuit.
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Typically, leakage inductances L ls, L lr should be around 2-10% of the magnetizing inductance L m. Due to the fact that the magnetizing inductance L m is much higher that leakage phase inductances L ls, L lr, it can be assumed that there is no current is floating to L m parallel branch. Rotor is at the stand still, while low voltage is applied to stator windings up to rated current. The locked rotor test, like short circuit test on a transformer, provides the information about leakage impedances and rotor resistance. Therefore, by applying equation (1) the magnetizing inductance is:įurthermore, the rotor “Rotor Flux current” should be set in the configuration as Then the motor run volts per Hertz and the respective results from Roborun+ utility are illustrated below.įrom the above results, it can been observed that the stator speed is close to the synchronous speed (2700 rpm), while the slip is very small due to the no-load operation. Therefore, the Volts per Hertz ratio introduced in configuration tab is V dc = 24 V (Input dc voltage at controller) The following data have been given from the induction motor manufacturer: Calculate the magnetizing inductance for the no load test according to equation (1).Furthermore, the peak amps value should be configured as “Rotor Flux current” in the configuration tab. Measure the motor RMS current from the utility (Motor Amps).In the considered no-load test the ma is 1000, therefore the applied voltage can be calculated as
![sanju movie poster sanju movie poster](https://i.pinimg.com/originals/ac/8a/54/ac8a54ae5d240704ab2ed7e08053a4e4.jpg)
Where m a is the output PWM level (%1000) applied which is equal to Motor Power output measurement in Roborun+ utility (-1000 to 1000 range) and V dc is the battery volts (V). Calculate the applied V s by the following equation:.Be sure that the configured volt per hertz is correct, by checking the “Stator speed RPM” to be approximately equal to manufacturer’s synchronous rated speed. Run the motor without load up to the maximum available voltage (Command=1000), utilizing small acceleration/deceleration value.Configure the Volt per Hertz setting according to motor nominal voltage (peak value of stator voltage according to manufacturer) and frequency.Set the operating mode to “Volts per Hertz” mode.In order to implement the above mentioned no load test with RoboteQ induction motor controllers, please follow these steps: Where V s (V) is the phase stator voltage applied (RMS value), f s (Hz) is the stator frequency and I (A) is the RMS motor amps. Therefore, the motor equivalent circuit is expressed as follows:Īssuming that the R s (Ω), L s(Η) are much lower than the magnetizing inductance L m (H), the following equation can be extracted: Motor will rotate at almost a synchronous speed, which makes slip nearly zero (s≈0). The motor will consume the necessary flux I d current in order to establish the appropriate magnetic field. The small power provided to the motor is due to core losses, friction and winding loses. The test is performed by applying balanced rated voltage on the stator windings at the rated frequency. The no-load test, like the open circuit test on a transformer, gives information about exciting flux I d current, the magnetizing inductance L m and rotational losses.