MOTOR UNIT

• US 20140021833A1
• Filed: 07/05/2013
• Published: 01/23/2014
• Est. Priority Date: 07/17/2012
• Status: Abandoned Application

• Current Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Original Assignee: Jtekt Corporation (Toyota Motor Corporation)
• Inventors: NAKAI, Motoo, WAKITA, Yasuyuki
• Application Number:
  US13/935,766
• Publication Number:
  US 20140021833A1
• Time in Patent Office: Days
• US Class Current: 310/68.D
• CPC Class Codes: H02K 11/225 Detecting coils
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 11/38 Control circuits or drive circuits associated with geared commutator motors of the worm-and-wheel type
• CPC Class Codes: H02K 5/22 Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02K 7/116 with gears

Abstract

A motor unit includes an electric motor that has a motor bracket that is fixed to an end portion of a motor housing that houses a rotor and a stator; a gear housing fixed to the motor bracket; and a circuit board that controls driving of the electric motor. The circuit board is wrapped on an outer face of a side wall of the gear housing.

Claims

1. A motor unit, comprising:

an electric motor having a motor housing that houses a rotor and a stator, and a motor bracket that is fixed to an end portion of the motor housing in an axial direction of the rotor;

a board support member located on an opposite side of the motor bracket from the motor housing in the axial direction; and

a circuit board that controls driving of the electric motor, and that is wrapped on an outer face of the board support member.

2. The motor unit according to claim 1, wherein:

the board support member has a side wall that is located radially inward of at least one of an outer peripheral face of the motor housing and an outer peripheral face of the motor bracket; and

the circuit board is wrapped on the side wall of the board support member.

3. The motor unit according to claim 1, wherein:

the motor bracket has a first fitting portion;

the board support member has a second fitting portion; and

the first fitting portion and the second fitting portion are fitted to each other.

4. The motor unit according to claim 1, wherein:

the electric motor has a bus bar that electrically connects the stator and the circuit board to each other;

the circuit board has a connection terminal that is connected to an end portion of the bus bar; and

the connection terminal and the end portion of the bus bar are fixed to each other with a bolt.

5. The motor unit according to claim 4, wherein the circuit board has a circuit board main body to which the connection terminal has been attached, and a resin cover portion that is made of an electrically insulating resin material, and that covers a portion of the circuit board main body other than the connection terminal.

6. The motor unit according to claim 1, wherein the motor unit has the circuit board as a multi-layer printed board formed of thermoplastic resin films.