JPS5462509A - Blower-noise reducing method by phase control - Google Patents
Blower-noise reducing method by phase controlInfo
- Publication number
- JPS5462509A JPS5462509A JP12890277A JP12890277A JPS5462509A JP S5462509 A JPS5462509 A JP S5462509A JP 12890277 A JP12890277 A JP 12890277A JP 12890277 A JP12890277 A JP 12890277A JP S5462509 A JPS5462509 A JP S5462509A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- runner
- noises
- hours
- phase control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
PURPOSE: To reduce the noises of more than two blowers at the same time by allowing the pressure waves to interfere each other through the phase control of the noise pressure waves of a plural number of blowers.
CONSTITUTION: Two runners 1 and 2 which are revolved by motors Mi and M2 are arranged on the same shaft in a casing 3. When the motor M2 is phase-shifted for the motor Mi by a fixed amount and driven, then noises interfere each other and are offset. Namely, when the distance between runners is l, and the velocity of noise is C, it takes l/C hours for the pressure wave I generated on the runner 1 to reach the position of the runner 2, therefore, in order to generate the pressure wave II which has reverse phase to the pressure wave I' after l/c hours on the runner 2, the revolution of the motor M2 is delayed by the hours At=l/C+T/2 for the motor Mi, then the phases of the pressure waves are made reverse each other on the discharge side, and noises are offset. T means a period.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12890277A JPS5462509A (en) | 1977-10-27 | 1977-10-27 | Blower-noise reducing method by phase control |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12890277A JPS5462509A (en) | 1977-10-27 | 1977-10-27 | Blower-noise reducing method by phase control |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5462509A true JPS5462509A (en) | 1979-05-19 |
JPS6142120B2 JPS6142120B2 (en) | 1986-09-19 |
Family
ID=14996173
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12890277A Granted JPS5462509A (en) | 1977-10-27 | 1977-10-27 | Blower-noise reducing method by phase control |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5462509A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999097A (en) * | 1982-11-26 | 1984-06-07 | Ebara Corp | Axial flow type hydraulic machine |
JP2007126983A (en) * | 2005-11-01 | 2007-05-24 | Toa Corp | Drive device of electric fan |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4997601A (en) * | 1972-11-24 | 1974-09-14 | ||
JPS5173746A (en) * | 1974-12-20 | 1976-06-25 | Matsushita Seiko Kk | TONNERUYOHAIKISOCHI |
JPS53122908A (en) * | 1977-04-04 | 1978-10-26 | Yasurou Nakanishi | Rotor blade apparatus |
-
1977
- 1977-10-27 JP JP12890277A patent/JPS5462509A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4997601A (en) * | 1972-11-24 | 1974-09-14 | ||
JPS5173746A (en) * | 1974-12-20 | 1976-06-25 | Matsushita Seiko Kk | TONNERUYOHAIKISOCHI |
JPS53122908A (en) * | 1977-04-04 | 1978-10-26 | Yasurou Nakanishi | Rotor blade apparatus |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5999097A (en) * | 1982-11-26 | 1984-06-07 | Ebara Corp | Axial flow type hydraulic machine |
JP2007126983A (en) * | 2005-11-01 | 2007-05-24 | Toa Corp | Drive device of electric fan |
JP4711802B2 (en) * | 2005-11-01 | 2011-06-29 | ティーオーエー株式会社 | Electric fan drive unit |
Also Published As
Publication number | Publication date |
---|---|
JPS6142120B2 (en) | 1986-09-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5364711A (en) | Brushless motor drive circuit | |
JPS525566A (en) | Electric clock | |
JPS5462509A (en) | Blower-noise reducing method by phase control | |
JPS53120576A (en) | Rotational speed display device of rotating bodies | |
JPS548817A (en) | Digital controller for motor | |
JPS5243926A (en) | Velocity control device of brushless motor | |
JPS5248710A (en) | Rotary engine | |
JPS5431526A (en) | Current controller for synchronous motor | |
JPS547110A (en) | Dual rotation pulse motor | |
JPS5278010A (en) | Marine propelling synchronous motor | |
JPS547508A (en) | Motor | |
JPS53122904A (en) | Centrifugal fan | |
JPS5362116A (en) | D,c, brushless motor | |
JPS52131113A (en) | Control unit for commutatorless motor | |
JPS5395212A (en) | Winding stator for brushless motor | |
JPS53147218A (en) | Commutator motor | |
JPS5476909A (en) | Rotary electromagnet | |
JPS5373313A (en) | One phase pulse motors | |
JPS5355271A (en) | Reciprocating electric razor | |
JPS5435311A (en) | Pulsee motor | |
JPS5216614A (en) | Method of generating electric power while assisting an electric motor by utilizing the reverse rotational torque of the motor | |
JPS5290052A (en) | Reclosing unit for multitransmission line | |
JPS53111416A (en) | Synchronous control system in multidirectional rotary scanner | |
JPS5413804A (en) | Turbine speed detecting circuit | |
JPS5297110A (en) | Permanent magnet rotary machine |