Control device and motor unit including the control device

Patent metadata

Field	Value
Publication number	US-9293970-B2
Application number	US-201314025000-A
Country	US
Kind code	B2
Filing date	Sep 12, 2013
Priority date	Sep 19, 2012
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A control device of a motor unit has a gear housing having a supporting wall portion, a ceramic portion formed on the supporting wall portion, a circuit board body fixed to the ceramic portion, a power element located inside the circuit board body, and a load receiving member that is located around the power element inside the circuit board body and receives a load applied to the circuit board body.

First claim

What is claimed is:

1. A control device, comprising:
a housing having a supporting wall portion; and
a circuit board comprising:
a ceramic portion formed on the supporting wall portion;
a circuit board body fixed to the ceramic portion;
a circuit element located inside the circuit board body; and
a plurality of load receiving members that at least partially surround the circuit element inside the circuit board body.

2. The control device according to claim 1 , wherein
the circuit board body comprises a metal junction portion, which is in conduction with the circuit element, on a surface thereof facing the ceramic portion; and
the ceramic portion comprises a conductive portion that is joined to the metal junction portion.

3. The control device according to claim 1 , further comprising:
a connection terminal rising from a surface of the circuit board body, the surface being on an opposite side of the circuit board body from a surface thereof facing the ceramic portion, and a terminal supporting member located at a portion inside the circuit board body, the portion corresponding to the connection terminal.

4. The control device according to claim 1 , further comprising:
a multilayer printed circuit board formed of thermoplastic resin films, as the circuit board body.

5. A motor unit comprising the control device according to claim 1 .

6. The motor unit according to claim 5 , wherein:
the motor unit includes a motor;
the motor includes a stator;
the control device has a connection terminal electrically connected to the stator, a power element that controls driving of the motor, and a control element that controls an operation of the power element;
the connection terminal rises from a surface of the circuit board body, the surface being on an opposite side of the circuit board body from a surface thereof facing the ceramic portion;
the power element is the circuit element located inside the circuit board body; and
the control element is adjacent to a peripheral edge of the circuit board body.

Assignees

• Jtekt Corp

Inventors

• Nakai Motoo
• Wakita Yasuyuki

Classifications

• H05K1/0263

  High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board (H05K1/0293 takes precedence) · CPC title

• H05K3/4632

  laminating thermoplastic or uncured resin sheets comprising printed circuits without added adhesive materials between the sheets · CPC title

• H02K11/38

  Control circuits or drive circuits associated with geared commutator motors of the worm-and-wheel type · CPC title

• H05K3/0058

  Laminating printed circuit boards onto other substrates, e.g. metallic substrates (H05K1/0281 takes precedence) · CPC title

• H05K1/185

  associated with components encapsulated in the insulating substrate of the PCBs; associated with components incorporated in internal layers of multilayer circuit boards · CPC title