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I completely agree FvM that thermal model algorithm will be the more accurate and reliable.
But, A product designed using Thermal model algorithm will have to prompt for many datas from the user like:
- Specific heat capacity of motor
- Running heat dissipation factor
- electrical resistance
-...
Every motor has a thermal limit curve.
For E.g.
If the current at any particular instance exceeds the value as of in the thermal limit curve, then motor starts heating up. Even 10 deg rise in temp above the rated value decreases the life of coil insulation by half.
Hence, this should be...
Brief Introduction of the project:
Three phase induction motor overload protection relay using a microcontroller based circuit.
Parameters being Monitored by Microcontroller:
Three phase current consumed by the motor.
Parameters known:
Motor's rated current
Service factor
Locked rotor current...
A low values capacitor (Say 0.01uF) will help the purpose. Moreover, Care should be taken that the cap is as close to the ADC as possible else it will result in formation of a trace loop antenna which will degrade EMC/EMI performance further.
Several times a smd choke (10uH, 0805) on the ADC...
In India 230VAC, 50Hz as nominal as in USA it is 110VAC, 60Hz.
The range of operating voltage of any device depends on the type of power supply used. Say for e.g. Most of the Linear power supplies have tolerance of +/- 10 to 15%. Same is the case with Capacitive and resistive power supplies...
Thank you. It helped me.
My application is a microcontroller based motor protection device. I m using 2 ADC to monitor IR and IB.
Since, a 3 phase induction motor is a balance load; IY (the unknown) should be = IR = IB
Is this assumption going to affect the performance of the motor protection...
Hi everyone,
In an delta connected system. I have the value of current flowing through R-Phase and Y-Phase.
How do I calculate the Current through B-Phase?
The 3 phase voltages and Load connected to them are unknown.
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