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Electric working machine

A technology for working machines and electric motors, which is applied to electric components, synchronous motors with stationary armatures and rotating magnets, and electromechanical devices, etc., can solve problems such as waste of energy and friction loss, and achieve the effect of improving energy efficiency and good cooling.

Inactive Publication Date: 2015-04-08
HITACHI KOKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a problem that frictional losses are caused by sliding between the commutator substrate and the brushes, thus wasting energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0032] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Incidentally, the same or equivalent devices, components, steps, etc. shown in the respective drawings are denoted by the same reference numerals, and repeated descriptions are appropriately omitted. In addition, the embodiments are intended to explain the present invention, not to limit the present invention; therefore, all the features and combinations thereof described in the embodiments are not necessarily essential to the present invention.

[0033] figure 1 is a perspective view showing an electric brush cutter 1 as an electric working machine according to the first embodiment of the present invention. A brush cutter 1 as an example of an electric working machine includes a power supply unit 3 , a pipe portion 4 , a handle portion 5 , a drive unit 6 and a cutting blade 7 . Cutting work is performed using the cutting blade 7 as a work unit mounted on th...

no. 2 example

[0057] Figure 9 A side sectional view of an electric trimmer 100 according to a second embodiment of the present invention is shown. The electric trimmer 100 includes: a casing 101; a handle portion 102 integrally formed with the casing 101; a brushless disc motor 10 disposed at a lower position inside the casing 101; a blade holding portion 110 fixed to the casing. body; and two blades 111 and 112, which are held on the blade holding portion 110 and can reciprocate.

[0058] The disc motor 10 is the same as the disc motor in the first embodiment in that it also includes the extension 45 of the coil plate 41 . In the second embodiment, the output shaft 31 of the disc motor 10 is rotatably supported by the bearing 120 fixed inside the housing 101 . The rotation of the output shaft 31 is transmitted to the two blades 111 and 112 via the transmission mechanism 121, and the two blades 111 and 112 are used as a working unit, and the transmission mechanism 121 is used to convert ...

no. 3 example

[0064] Figure 10 A side sectional view of an electric trimmer 100A according to a third embodiment of the present invention is shown. In this case, the disc motor 10A does not have an extension provided on the coil plate 41, so the motor drive circuit (inverter circuit or control circuit) is provided as a separate circuit board 140 located on the centrifugal fan 90 in the channel of the fan airflow generated. That is, the circuit board 140 is disposed in an air flow passage entering the centrifugal fan 90 from the air intake hole 130 through an upper opening of the fan guide 91 (eg, an opening formed around the output shaft 31 ). Other configurations are the same as those in the second embodiment.

[0065] In the third embodiment, the circuit board 140 on which the motor drive circuit is mounted can also be effectively cooled by the fan air flow. The disc motor 10A and the circuit board 140 on which the motor driving circuit is mounted are independent from each other, ther...

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PUM

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Abstract

To provide an electric working machine, in which a brushless motor is mounted, in order to improve energy efficiency. An electric working machine includes: a disk motor including a rotor having a permanent magnet pole, an output shaft fixed to the rotor and serving as a rotation center of the rotor and a stator configured to generate a magnetic field with respect to the rotor; and a housing configured to accommodate the rotor therein and to rotatably support the output shaft. The stator includes: a magnetic yoke facing the rotor; and a coil board provided on a surface of the yoke facing the rotor. The stator is fixed to the housing side. The coil board has an extension portion on an outer circumferential edge thereof. Electric circuit elements for a motor driving circuit are mounted on the extension portion.

Description

technical field [0001] The present invention relates to an electric work machine, such as an electric brush cutter or electric trimmer equipped with a brushless disc motor. Background technique [0002] Generally, a brushed motor is used as a power source of an electric brush cutter for cutting grass or an electric trimmer for trimming hedges or plants. As such a brushed motor, a small flat disc motor has been proposed. [0003] Such a disk motor includes: a rotor coil plate on which a coil pattern is printed; and a rotating shaft holding the rotor coil plate and configured to output a rotational force by applying a magnetic field to the rotor coil plate. Compared with a motor whose rotor is made of a magnetic core wound with copper wire, a disc motor is light in weight, low in noise, vibration and high in efficiency. [0004] The rotary shaft has a flange portion integrated with the rotary shaft. The rotor coil plate is fixed coaxially with the rotating shaft and in cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/24H02K11/00H02K9/06H02K3/26H02K7/14H02K1/27
CPCH02K11/0073H02K3/26H02K21/24B25F5/008H02K7/145H02K9/06H02K11/33
Inventor 山口勇人谷本英之
Owner HITACHI KOKI CO LTD
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