Propulsion system, propulsion control device, and non-transitory computer readable storage medium

A propulsion control device configured to control a propulsion system including a motor, which is configured to be driven to propel a moving object, the propulsion control device comprising:

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to cause the propulsion control device to:
• acquire driving information indicating a driving state of the motor;
• and
• manage demagnetization of a permanent magnet of the motor using the driving information as acquired, wherein
• the driving state of the motor includes at least
• an abnormal region indicating that a motor temperature of the motor rises to an extent corresponding to an abnormality of a rotor magnet or the motor, or
• a demagnetization region indicating that demagnetization of the rotor magnet is likely to occur within a range not corresponding to an abnormality of the rotor magnet, and
• the at least one of the circuit and the processor is further configured to cause the propulsion control device to:
• limit a motor current when the driving state of the motor is in the abnormal region;
• and
• store, in a management storage device, an accumulated demagnetization time that is obtained by accumulating a time, during which the driving state of the motor is in the demagnetization region, when the driving state of the motor is in the demagnetization region.

A non-transitory computer readable storage medium storing a program to control a propulsion system including a motor, which is configured to be driven to propel a moving object, the program comprising instructions configured to, when executed by at least one processor, cause the at least one processor to:

• acquire driving information indicating a driving state of the motor;
• and
• manage demagnetization of a permanent magnet of the motor using the driving information, wherein
• the driving state of the motor includes at least
• an abnormal region indicating that a motor temperature of the motor rises to an extent corresponding to an abnormality of a rotor magnet or the motor, or
• a demagnetization region indicating that demagnetization of the rotor magnet is likely to occur within a range not corresponding to an abnormality of the rotor magnet, and
• the instructions are further configured to, when executed by the at least one processor, cause the at least one processor to:
• limit a motor current when the driving state of the motor is in the abnormal region;
• and
• store, in a management storage device, an accumulated demagnetization time that is obtained by accumulating a time, during which the driving state of the motor is in the demagnetization region, when the driving state of the motor is in the demagnetization region.