Electromagnetic drive coil unit and molding method thereof

Patent metadata

Field	Value
Publication number	US-9793038-B2
Application number	US-201514679458-A
Country	US
Kind code	B2
Filing date	Apr 6, 2015
Priority date	Apr 16, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A method of molding an electromagnetic drive coil unit is provided which can secure satisfactory strength and waterproof properties. In a method of molding an electromagnetic drive coil unit in which a stator assembly includes bobbins having stator coils wound thereon and yokes in which an inner yoke having magnetic pole teeth and an outer yoke having magnetic pole teeth are combined and in which the stator assembly and a power supply terminal supplying power to the bobbins are molded in a resin, an inner molding process is performed on the inside of the outer yoke in a state where ends of the stator coils of the stator assembly are connected to the power supply terminal and an outer molding process is performed to cover an outer circumference of the stator assembly having an inner molded portion and an outside of the power supply terminal after the inner molding process.

First claim

What is claimed is:

1. A resin molded electromagnetic drive coil unit comprising:
a stator assembly including a cylindrical yoke having magnetic pole teeth formed therein, a stator coil, and a power supply terminal to the stator coil, and
a connector frame member surrounding the power supply terminal to the stator coil,
wherein the stator assembly and the connector frame member which are molded through separate processes are formed as a unified body, and
wherein said connector frame member is molded in advance, said connector frame member is inserted onto the stator assembly, and the resultant is molded as a unified body.

2. The resin molded electromagnetic drive coil unit according to claim 1 , wherein an outer circumference of the stator assembly is molded in a resin in a state in which the connector frame member is connected to the stator assembly.

3. The resin molded electromagnetic drive coil unit according to claim 1 , wherein said connector frame member includes a connector portion to which a plug is adapted to be inserted, and a coupling portion which is in contact with an outer circumference of the yoke of the stator assembly, and outer circumferences of the stator assembly and the coupling portion are molded in a resin.

4. The resin molded electromagnetic drive coil unit according to claim 3 , wherein the coupling portion of the connector frame member is provided with ribs for enhancing bondability to the molding resin.

5. The resin molded electromagnetic drive coil unit according to claim 1 , wherein introduction holes are formed in side walls of the yoke of the stator assembly for introducing the resin therein.

6. The resin molded electromagnetic drive coil unit, wherein the stator assembly which is molded in advance is used as an inner molded body and a connector frame member is formed as a unified body with the inner molded body through an outer molding process,
herein the stator assembly including a cylindrical yoke having magnetic pole teeth formed therein, a stator coil, and a power supply terminal to the stator coil, and
and the connector frame member surrounding the power supply terminal to the stator coil,
wherein the stator assembly and the connector frame member which are molded through separate processes are formed as a unified body, and
wherein said connector frame member is molded in advance, said connector frame member is inserted into the stator assembly, and the resultant is molded as a unified body.

7. The resin molded electromagnetic drive coil unit according to claim 6 , wherein the outer molding process is a resin molding process.

8. A resin molded electromagnetic drive coil unit having a double molded structure comprising:
a stator assembly including a cylindrical yoke having magnetic pole teeth formed therein, a stator coil, and a power supply terminal to the stator coil, and
a connector frame member surrounding the power supply terminal to the stator coil,
wherein the stator assembly and the connector frame member which are molded through separate lower pressure processes are formed as a unified body, and
wherein said connector frame member is molded in advance, said connector frame member is inserted onto the stator assembly, and the resultant is molded as a unified outer body at a higher pressure than the stator assembly and has added strength to form the double molded structure.

9. The resin molded electromagnetic drive cell unit having a double molded structure of claim 8 , wherein the stator assembly is an inner molded structure and the unified outer body has fewer void space than the inner molded stator assembly.

Assignees

• Fujikoki Corp

Inventors

• Arai Yusuke
• Hosoya Takeshi

Classifications

• H02K15/12

  Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H01F7/128 Primary

  Encapsulating, encasing or sealing · CPC title

• H02K5/08

  Insulating casings · CPC title

• H02K37/14

  with magnets rotating within the armatures · CPC title