| 摘要 |
<p>A barrel or face-type carbon-segment commutator assembly (12c) for an electric motor includes a segmented commutating surface (22c) defined by an annular array of commutator sector (14c, 18c), each sector including a carbon segment (18c) connected to a respective conductor section (14c). To form the assembly, an annular carbon cylinder (20c) is overmolded onto a copper blank (70c) and radial grooves (54c) are formed in an inside surface of the carbon cylinder opposite the communicating surface. An insulator hub (24c) is overmolded onto the carbon cylinder and into the radial grooves. Slots (56c) are then machined inward from the communicating surface to the insulator-filled grooves to isolate the commutator sectors. The remaining insulator material mechanically interlocks the sectors. In other embodiments, the commutator assembly (100) is formed by soldering a carbon cylinder (142) to conductor sections (102) before overmolding a hub (112) and cutting slots (108) to isolate commutator sectors (106).</p> |
