Abstract: The remaining life estimation device is a remaining life estimation device of a power converter including a life part accommodated in a case. The remaining life estimation device includes a processor for calculating remaining life information of the life part. The processor calculates a cumulative exposure time for each life part temperature of the life part, converts each cumulative exposure time into a converted cumulative exposure time by reflecting a life conversion coefficient to each cumulative exposure time calculated for each life part temperature, and calculates the remaining life information based on a life reduction time that is a sum of the converted cumulative exposure time for each life part temperature and a reference life time that is a life time of the life part under the reference value.

Abstract: The specification is related to a motor controller, a vehicle including the motor controller and a heat stress estimating method for a switching element. The motor controller includes a switching element, a temperature sensor, and a computer. The switching element is configured to convert output electric power of an electric power supply into motor-driving electric power. The temperature sensor is configured to measure a temperature of the switching element. The computer is configured to extract a maximum point and a minimum point in a time-dependent change in the temperature of the switching element, the computer is configured to calculate a temperature difference between the maximum point and the minimum point adjacent to each other and configured to calculate an estimated value of a heat stress to which the switching element is subjected based on each calculated temperature difference.

Abstract: The specification is related to a motor controller, a vehicle including the motor controller and a heat stress estimating method for a switching element. The motor controller includes a switching element, a temperature sensor, and a computer. The switching element is configured to convert output electric power of an electric power supply into motor-driving electric power. The temperature sensor is configured to measure a temperature of the switching element. The computer is configured to extract a maximum point and a minimum point in a time-dependent change in the temperature of the switching element, the computer is configured to calculate a temperature difference between the maximum point and the minimum point adjacent to each other and configured to calculate an estimated value of a heat stress to which the switching element is subjected based on each calculated temperature difference.