Shake window electric machinery looks from the design, to shed structure of ambipolar permanent magnetism continuously, two-way rotate electric machinery, take bimetallic piece or polymer PTC sheds protector to protect electric machinery effectively too not because of exterior breakdown (like switch breakdown) and burn down. Hold the wide application of electronic instrument equipment as the car, leader plant rises increasingly to shaking the radio interference rejection of window electric machinery asks, shake window electric machinery takes a pair of brush and commutator surface contact, when electric machinery high speed rotates, the electricity that carries brush shows communication to change, can produce scintilla with commutator surface and electromagnetic wave of disperse the internal heat with sudorifics (radio signal) , be aimed at this one characteristic, manufacturer of production of each electric machinery used the EMC circuit that interference rejection of contented taller radio asks in succession, can filter the electromagnetic wave that electric machinery oneself gives out, satisfy the client's requirement. Shake because window electric machinery needs two-way rotate, in electric machinery so two end designed main shaft to use special wear-resisting impulse withstand the spacing hammer of material, the iteration that can endure electric machinery main shaft is pounded and high speed rotates, avoid to produce metallic concussion and attrition noise. Shake window electric machinery is assembled fall in door glass, because wash the water when the car to develop electric machinery extremely easily, ask to electric machinery waterproof so particularly tall, most now electric machinery uses hermetically sealed design, electric machinery movement produces temperature rise hind to make generation of electric machinery inside and outside presses difference easily, break through in the weakest sealed point sealed, right now electric machinery needs a respirator official to balance inside and outside to press difference, the sealed place of incorrect weakness produces impact, breathe freely film rises just about come here action, it can carry gas, balance inside and outside presses difference, can cut off liquid current to enter electric machinery again, make electric machinery achieves hermetically sealed truly waterproof design requirement. To achieve the goal that reduces electric machinery weight and cost, each production manufacturer used high strenth project in succession plastic the material that the zincic aluminium alloy that replaces a tradition regards reducer casing as, at the same time compositive the application that turns electronic module makes electric machinery had single bond to spark rise automatically and take the function that prevent clip, and as can compositive as door controller, have news report through controller of the other inside connection of bus line structure and car.