描述
散熱設(shè)計是整個結(jié)構(gòu)設(shè)計的重點,也是關(guān)乎整機(jī)性能的關(guān)鍵。散熱形式分為三種:自冷、風(fēng)冷和水冷。合康變頻器通常采用風(fēng)冷散熱,一般要設(shè)計獨立的散熱風(fēng)道(獨立風(fēng)道指風(fēng)所經(jīng)過的通道與整機(jī)其它部件相隔離)。風(fēng)機(jī)安放在進(jìn)風(fēng)端是吹風(fēng)方式,安放在出風(fēng)口為抽風(fēng)方式。兩種方式可按實際情況靈活選用。合康變頻主要通過散熱器的優(yōu)化和風(fēng)道的優(yōu)化來實現(xiàn)變頻器散熱系統(tǒng)的優(yōu)化設(shè)計。
(一)散熱器的優(yōu)化
合康變頻使用的散熱器以型材散熱器和插片式散熱器為主。小功率變頻器一般選擇型材散熱器。型材散熱器采用壓注法可以將散熱片做成多種立體形狀,散熱片可根據(jù)需求做成各種復(fù)雜形狀,因工藝簡單而被廣泛采用。
大功率變頻器一般采用插片式散熱器。由于大功率變頻器發(fā)熱相對嚴(yán)重,插片散熱器的散熱片細(xì)長比較型材散熱器可高60倍以上,在相同體積內(nèi)散熱面積可以大大增加,提高散熱效果,且散熱片可選用不同材質(zhì)制作。缺點是利用導(dǎo)熱膏和焊錫結(jié)合散熱片會存在介面阻抗問題,從而影響散熱。
上述兩種散熱器的設(shè)計優(yōu)化可以通過散熱器大小、基板厚度、散熱片間距等參數(shù)來實現(xiàn)。
散熱片的基板厚度對提高散熱片的效率有很大影響,基板足夠厚夠厚才能保證足量的熱能順利傳到所有的散熱片。但底部太厚會造成材料的浪費和熱累積,從而導(dǎo)致熱傳能力下降。好的基板設(shè)計必須保證厚度由熱源部分向邊緣部份漸薄,才可使散熱片由熱源部分吸熱,然后向周圍較薄的部分迅速傳遞。合康變頻通過熱仿真軟件對變頻器進(jìn)行熱分析,如圖1,通過圖中溫度和流場的顯示來了解溫度分布和風(fēng)速大小,根據(jù)溫升結(jié)果來判斷該散熱器是否能滿足散熱需求。如果分析結(jié)果顯示模塊溫升過高,則可以通過改變散熱器大小、基板厚度和散熱片間距等參數(shù)設(shè)計最優(yōu)的散熱器,使散熱器滿足散熱需求,提高整機(jī)運行的性能,避免散熱器反復(fù)打樣。
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