| 摘要 |
The present invention relates generally to tuning the flow of cooling air across converter and inverter heat sinks in a motor drive system. More specifically, present techniques relate to motor drive duct systems including heat sinks with separate, sequential heat sink fin sections disposed in a common cooling air path and having different geometries to optimize the flow of cooling air across and between fins of the separate heat sink fin sections. For example, the heat sink fin sections may have different fin lengths, fin heights, fin counts, fin pitch (e.g., distance between adjacent fins), and so forth. Each of these different geometric characteristics may be tuned to ensure that temperatures and temperature gradients across the heat sinks are maintained within acceptable ranges. |
| 主权项 |
1. A power electronic system, comprising:
a cooling air duct that, in operation, channels a flow of cooling air; first, second, and third power electronic switching modules that, in operation, perform controlled switching of respective first, second, and third phases of AC power, the power electronic switching modules being disposed adjacent to the cooling air duct; and first, second, and third heat sink sections disposed adjacent to the first, second, and third power electronic switching modules and extending into the cooling air duct in a sequential configuration wherein the second heat sink section receives cooling air from the first heat sink section, and the third heat sink section receives cooling air from the second heat sink section, each of the first, second, and third heat sink sections being physically configured differently from the other heat sink sections, wherein the first, second, and third heat sink sections comprise respective first, second, and third sets of fins disposed on a side of the respective heat sink section opposite the respective power electronic switching module and having first, second, and third pitches, respectively, that define a distance between adjacent fins, the first pitch being greater than the second and third pitches. |
