Motorized equipment

• US 8,564,161 B1
• Filed: 05/28/2013
• Issued: 10/22/2013
• Est. Priority Date: 04/16/2010
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Yamasaki, Masashi
• Primary Examiner(s): Lam, Thanh
• Application Number:
  US13/903,003
• Publication Number:
  US 20130257194A1
• Time in Patent Office: 147 Days
• Field of Search: 310/68.R, 310/71, 310/64, 310/68.B
• US Class Current: 310/68.R
• CPC Class Codes: B62D 5/0406 including housing for electronic control unit
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 9/227 Heat sinks

Abstract

A power module, a control board and a heat sink are provided on one axial side of a shaft of an electric motor, which consists of a motor case, a stator, a rotor, the shaft and the like. The power module is electrically connected with extraction lines, which extend from a coil wound around the stator, and supplies a drive current to the coil. The control board for controlling switching of the power module is provided on a motor case side of the power module. The heat sink is provided on a side of the control board opposite to the motor case. Thus, when setting of an output of the electric motor is changed, a body size of the heat sink can be changed without changing a positional relationship between the control board and the electric motor and a positional relationship between the power module and the electric motor.

Claims

1. A motorized equipment comprising:

a motor case;

a stator fixed inside the motor case;

a rotor provided to be rotatable relative to the stator;

a shaft that is fixed to the rotor and that is rotatably supported by the motor case;

a power module including a plurality of power transistors that are electrically connected with extraction lines extending from a coil wound around the stator or the rotor, the power transistors supplying a drive current to the coil;

a control board that controls switching of the power transistors; and

a heat sink that is arranged apart from the shift and is provided on one axial side of the shaft, and that absorbs a heat generated by the power transistors,

wherein;

the heat sink has a columnar member outside a center portion of the heat sink, the columnar member extending in an axial direction of the shaft; and

the heat sink has a heat receiving surface on a power module side of the columnar member.

2. A motorized equipment comprising:

a motor case;

a stator fixed inside the motor case;

a rotor provided to be rotatable relative to the stator;

a shaft that is fixed to the rotor and that is rotatably supported by the motor case;

a plurality of power transistors that are provided on one axial side of the shaft outside the motor case, and that are electrically connected with extraction lines extending from a coil wound around the stator or the rotor, the power transistors supplying a drive current to the coil;

a control board that is provided outside the motor case, and that controls switching of the power transistors; and

a heat sink that is provided outside the motor case, and that absorbs a heat generated by the power transistors;

a magnet that is provided outside the motor case, and that is provided on one axial end portion of the shaft; and

a position sensor that is provided outside the motor case and that outputs a signal corresponding to a direction of a magnetic field generated by the magnet.

3. The motorized equipment according to claim 2, wherein:

the position sensor is mounted on the control board.