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1/14/2021 RMS PM Hardware User Manual 44 of 54
3.7.8 Resolver Interface:
A resolver is a position sensor that is often used with Permanent Magnet type motors. There
are various types of resolvers. The resolver requires an excitation voltage and provides a
SIN and COS feedback.
The PM Controllers (Gen3) have a resolver excitation frequency that matches the PWM
frequency (12kHz). The excitation voltage from the controller can be adjusted as needed.
The excitation voltage is adjusted so that the SIN/COS feedback voltage is no more than
1.2Vpk.
The RM, PM (Gen5), and CM200 inverters have an excitation frequency of 10kHz that is not
synchronized with the PWM frequency. These controllers use a dedicated Resolver to
Digital Converter (RDC).
For RM and Gen 5 the target SIN/COS voltage is 3.15Vpk-pk ± 27%.
For CM200 the target SIN/COS voltage is dependent on how the RDC is configured.
Contact Cascadia Motion for more information.
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