The invention discloses a preparation method for a motor slot wedge. The slot wedge comprises the following components in percentage by weight: 14 to 16 percent of
unsaturated polyester resin, 0.1 to 0.3 percent of internal
release agent, 0.8 to 1.2 percent of tert-butyl perbenzoate, 0.6 to 1.0 percent of
dibenzoyl peroxide, 5 to 8 percent of talcum
powder, 28 to 30 percent of alkali-free
glass fiber, and the balance of iron-
nickel alloy powder. The preparation method comprises the following steps of: (1) preparing an
adhesive with the iron-
nickel alloy powder; (2) impregnating the
glass fiber with the
adhesive; (3) performing
pultrusion; (4) cooling and
cutting; (5)
grinding the head of the
cut slot wedge; (6) painting the surface of the slot wedge to make the surface of the slot wedge smooth and burr-free; and (7)
drying, detecting and packing.