Motor endshield assembly for an electronically commutated motor

H - Electricity – 02 – K

Patent

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Details

H02K 11/00 (2006.01) H02K 9/00 (2006.01) H02K 11/04 (2006.01)

Patent

CA 2333949

An endshield assembly (100) for an electronically commutated motor includes an endshield (100), a control assembly (104) and a power assembly (106). The endshield (100) includes a plurality of recessed fins (132) on an outer surface, and a substantially flat raised portion on an internal surface. The raised portion is in contact with a thermal pad (112). The control assembly (104) includes the thermal pad (112) and a control board (108) on which is located a plurality of power transistors (110). The thermal pad (112) provides thermal contact between the transistors (110) and the endshield (100) to enable the endshield (100) to dissipate heat from the transistors (110). The transistors (110) include a plurality of leads (128) that extend substantially parallel to the control board (108) which enable the leads (128) to be coated for protection against harsh environments. The power assembly (106) includes a power board (138) having an insulator (146) positioned between the power board (138) and the control board (108).

L'invention concerne un ensemble écran d'extrémité (100) pour moteur à commutation électronique, comprenant un écran d'extrémité (100), un ensemble de commande (104) et un ensemble de puissance (106). L'écran d'extrémité (100) comprend plusieurs ailettes en cavité (132) sur une surface extérieure, et une partie plate sensiblement surélevée sur une surface interne. La partie surélevée est en contact avec un tampon thermique (112). L'ensemble de commande (104) englobe le tampon thermique (112) et un panneau de commande (108) sur lequel se trouvent plusieurs transistors de puissance (110). Le tampon thermique (112) assure le contact thermique entre les transistors (110) et l'écran d'extrémité (100), permettant ainsi à cet écran (100) de dissiper la chaleur provenant des transistors (110), Lesdits transistors (110) comportent plusieurs conducteurs (128) qui s'étendent sensiblement parallèlement au panneau de commande (108), ce qui permet de revêtir les conducteurs (128) pour les protéger contre des conditions ambiantes rigoureuses. L'ensemble de puissance (106) comprend un panneau de puissance (138) doté d'un isolant (146) qui est placé entre le panneau de puissance (138) et le panneau de commande (108).

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