| 摘要 |
<p>A lifetime judging section (9g) judges whether the lifetime of a power module has reached its limit or not using the degree of thermal fatigue based on the number of times the heat generation temperature variation width ?T is referred to and a preset lifetime value. Information about the content of lifetime judgment of the power module and about the content of prediction from the lifetime judging section (9g) is delivered to a main control section (9a) and a speed control section (9c).</p> |
