calculate samples and sample time from switching frequency, No of poles, Machine rpm.

How do I calculate samples and sample time from switching frequency, No of poles, Machine rpm.

Answer 1

[Sabin]

Electrical speed [rad/s] = mechanical_rpm*(2*pi/60)*Pp

Electrical frequency [Hz] = Electrical speed [rad/s] / (2*pi)

Electrical frequency [s] = 1 / Electrical frequency [Hz]

No samples per electrical revolution = Electrical frequency [s] / Ts

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Example: 5000 rpm, No pole pairs Pp=5 and Ts=6.25e-5

Electrical speed [rad/s] = 5000*(2*pi/60)*5 = 2618 rad/s

Electrical frequency [Hz] = 2618 / (2*pi) = 416.67

Electrical frequency [s] = 1 / 416.67 = 0.024 s

No samples per electrical revolution = 0.024 / 6.25e-5 = 38.4

I hope this helps.

[adhavan d]

Thank you