Title:
AIR CONDITIONER AND AIR CONDITIONER FOR RAILROAD VEHICLE
Document Type and Number:
Japanese Patent JP2019066156
Kind Code:
A
Abstract:
To provide an air conditioner and an air conditioner for railroad vehicle that can suppress a beating sound imparting unpleasantness from being generated and also suppressing respective compressors from differing in air conditioning capability.SOLUTION: An air conditioner 100 comprises: compressors 1a, 1b which compress and discharge a refrigerant; induction motors 8a, 8b which are provided for the compressors 1a, 1b respectively; a controller 11 which derives a frequency of an AC voltage applied to the induction motors 8a, 8b as a drive frequency; inverters 10a, 10b which convert the frequency of a supply power source into the drive frequency and output it to the induction motors 8a, 8b; acceleration sensors 5a, 5b; and determination means which determines whether a difference in rotating speed between the induction motors 8a, 8b is within a range in which a beating sound of predetermined frequency is generated. The controller 11 corrects, when it is determined that the difference in rotating speed between the induction motors 8a, 8b is within the range, the drive frequency so that the difference in rotating speed between the induction motors 8a, 8b is less than a lower-limit value of the range.SELECTED DRAWING: Figure 1
Inventors:
YAMAMOTO HIROSHI
KAMIGAI YASUMI
KAMIGAI YASUMI
Application Number:
JP2017195276A
Publication Date:
April 25, 2019
Filing Date:
October 05, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
F24F11/86; B61D27/00; H02P5/50
Domestic Patent References:
| JPH11245807A | 1999-09-14 | |||
| JP2008039260A | 2008-02-21 | |||
| JPS61178585A | 1986-08-11 | |||
| JP2004332973A | 2004-11-25 |
Foreign References:
| WO2013111409A1 | 2013-08-01 |
Attorney, Agent or Firm:
Kanako Murakami
Shigeaki Matsui
Kuratani Yasutaka
Kenro Date
Shigeaki Matsui
Kuratani Yasutaka
Kenro Date