MOTORIZED EQUIPMENT

• US 20110254388A1
• Filed: 04/15/2011
• Published: 10/20/2011
• Est. Priority Date: 04/16/2010
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: YAMASAKI, Masashi
• Granted Patent: US 8,471,418 B2
• Time in Patent Office: Days
• US Class Current: 310/43
• 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 plurality of power transistors that are provided on one axial side of the shaft outside the motor case such that the power transistors 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 on a rotor side of the power transistors outside the motor case for controlling switching of the power transistors; and

a heat sink that is provided on the other side of the control board opposite to the rotor side outside the motor case for absorbing a heat generated by the power transistors.

2. The motorized equipment as in claim 1, further comprising:

a magnet provided on one axial end portion of the shaft; and

a position sensor provided to the control board for outputting a signal corresponding to a direction of a magnetic field generated by the magnet.

3. The motorized equipment as in claim 1, wherein

the power transistors and the control board are fixed to the heat sink, and

the heat sink and the motor case are connected with each other.

4. The motorized equipment as in claim 1, wherein

the power transistors are inserted in a resin mold, which is molded in the shape of a plate, together with wirings connecting the power transistors by resin molding, thereby forming a power module, and

the control board, the power module and the heat sink are arranged in this order from the motor case side along the axial direction of the shaft.

5. The motorized equipment as in claim 4, further comprising:

electronic components provided on a side of the power module opposite to the control board with respect to a board thickness direction of the power module, the electronic components being electrically connected with the wirings connecting the power transistors, wherein

the heat sink has a recess for accommodating the electronic components.

6. The motorized equipment as in claim 5, further comprising:

a shield member provided between the power module and the position sensor.

7. The motorized equipment as in claim 6, wherein

the shield member is inserted in the resin mold together with the power transistors and the wirings connecting the power transistors by the resin molding, thereby forming the power module.

8. The motorized equipment as in claim 1, wherein

the extraction lines extending from the coil extend through holes, which are formed in the control board in a board thickness direction of the control board, and are electrically connected with terminals of the power transistors.

9. The motorized equipment as in claim 1, further comprising:

a cover provided on a side of the heat sink opposite to the motor case, the cover having a function to shield a radiation noise.