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Manufacture of coil core for stepper motor e.g. for internal combustion engine flow control valve, by fitting yokes into positioning device in molding die and injecting resin
Manufacture of coil core for stepper motor e.g. for internal combustion engine flow control valve, by fitting yokes into positioning device in molding die and injecting resin
A molding die (40) is provided with a positioning device (50) for holding multiple yokes in a predetermined position. With the die open, the yokes are consecutively fitted into the positioning device to form a stack. The die is then closed, and a melted synthetic resin is injected into the die, to form a coil core (20) of synthetic resin, containing the yokes. Independent claims are included for a molding die, and for a yoke set.
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