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MCF8329A: Maximum speed and Speed_feedback

Part Number: MCF8329A
Other Parts Discussed in Thread: MOTORSTUDIO

Tool/software:

Hello,


I have a medical device using a motor, with a maximum speed of 2100RPM and 4 pair of poles (MotorStudio says its the maximum speed in Hz is 140). When trying to calculate the estimated speed, with the formula:

Estimated speed = (SPEED_FDBK / 2^27)*MAXIMUM_SPEED_HZ

I dont get a reasonable value for the Estimated speed, any idea on what i may be doing wrong? should i use other value than the 140Hz?

Thank you very much