The brake wheel is a key part of portal frame crane, and its earlier failure and heat treatment defect during manufacture and use is the key factor, which affects the cost and efficiency.

制动轮是门座式起重机制动装置的关键零件，制动轮在生产制造和使用过程中的早期失效及热处理缺陷是影响生产成本及效率的重要因素。

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It is proved that, frequency conversion has excellent accent speed, a brake capability, high efficiency rate, great credit rate factor and joint electricity effect and other merits.

实践证明，变频调速具有优异的调速和起制动性能，以及高功率因素和高效率的节电能力等优点，而被国内外公认为最有发展前途的调速方式。

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