Motor stator resistance calculation

An apparatus comprising:

• a processor;
• a memory storing code executable by the processor to perform:
• estimating an output voltage using a Direct Current (DC) bus voltage and a duty ratio for a motor drive at a first switching frequency and at least one second switching frequency;
• measuring an output current at the first switching frequency and the at least one second switching frequency;
• calculating a first stator resistance for the first switching frequency and at least one second stator resistance for the at least one second switching frequency;
• estimating a stator resistance at a DC condition based on the first stator resistance and the at least one second stator resistance;
• and
• setting a dynamic compensation based on a stator resistance error between the first switching frequency and the at least one second switching frequency.

A computer program product, the computer program product comprising a non-transitory computer readable storage medium having program code embodied therein, the program code readable/executable by a processor to perform:

• estimating an output voltage using a Direct Current (DC) bus voltage and a duty ratio for a motor drive at a first switching frequency and at least one second switching frequency;
• measuring an output current at the first switching frequency and the at least one second switching frequency;
• calculating a first stator resistance for the first switching frequency and at least one second stator resistance for the at least one second switching frequency;
• estimating a stator resistance at a DC condition based on the first stator resistance and the at least one second stator resistance;
• and
• setting a dynamic compensation based on a stator resistance error between the first switching frequency and the at least one second switching frequency.