Why does Simulink BLDC model block reports 1/10 of given Rotor-induced back emf

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KNeu 2020-9-9

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评论： KNeu 2020-10-6

Using the ready-to-use model "BLDC_back_EMF" and entering a value of 9V for the property Rotor-induced back emf (settings tab Rotor) the scope block is reporting 0.9V peak-peak (1rpm, simulation time 1sec, input speed 2pi); this behaviour is consistent for possible units mV, V and kV) and independent of the number of pole-pairs which is correct.

Anything which i didn't understand?

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Joel Van Sickel 2020-9-10

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Hello KNeu,

the back EMF is dependent on motor speed. If you spin your motor faster, you will see the the output voltage increase. What value did you specify you for the back EMF measurement? In addition to that, back EMF is not the same as output voltage. You also have to take into account the current and impedance of the machine.

Regards,

Joel

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KNeu 2020-10-6

Hello Joel

clear. Didn't noticed that the value provided in the parameter Rotor speed used for back emf measurement links to the parameter Rotor-induced back emf. My fault.

KNeu 2020-10-6