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Acoustic Absorption Material For Reduction Of Motor Noise In Induction Motor
Abstract: Acoustic experiments has revealed that aero acoustic noise generated from the external fan (3) is the dominant source of motor noise. External fan (3) is located inside a rectangular plenum chamber (5). In the original design of the motor (1) there is a silencer at the inlet of plenum chamber air entry cutout (22) and further reduction of noise only be possible by acoustic treatment of plenum chamber (5). To meet this objective, novel acoustic absorption material (25) is pasted at the inner surface of the plenum chamber (5) using adhesive and further secured by using wire mesh (24). Number of blades in the fan (3) is increased from nine to eleven such that used acoustic absorption material (25) becomes effective in produced noise frequency range. Fan blade redesigned from straight type to curve type with change in fan blade outer angle while flow rate is kept same. Thickness of the used MPSR variant R45+04 (25) is optimized within range 10-20 mm.
Notices, Deadlines & Correspondence
Patent Information
Applicants
BHARAT HEAVY ELECTRICALS LIMITED
Inventors
1. ASFAK ALI MOLLAH
2. VIJAYA SREE NK
3. RAGHUNANDAN S
Specification
Acoustic experiments has revealed that aero acoustic noise generated from the external fan (3) is the dominant source of motor noise. External fan (3) is located inside a rectangular plenum chamber (5). In the original design of the motor (1) there is a silencer at the inlet of plenum chamber air entry cutout (22) and further reduction of noise only be possible by acoustic treatment of plenum chamber (5). To meet this objective, novel acoustic absorption material (25) is pasted at the inner surface of the plenum chamber (5) using adhesive and further secured by using wire mesh (24). Number of blades in the fan (3) is increased from nine to eleven such that used acoustic absorption material (25) becomes effective in produced noise frequency range. Fan blade redesigned from straight type to curve type with change in fan blade outer angle while flow rate is kept same. Thickness of the used MPSR variant R45+04 (25) is optimized within range 10-20 mm.
Documents
Orders
| Section | Controller | Decision Date |
|---|---|---|
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202033034075-IntimationOfGrant13-05-2024.pdf | 2024-05-13 |
| 1 | 202033034075-STATEMENT OF UNDERTAKING (FORM 3) [08-08-2020(online)].pdf | 2020-08-08 |
| 2 | 202033034075-PatentCertificate13-05-2024.pdf | 2024-05-13 |
| 2 | 202033034075-PROOF OF RIGHT [08-08-2020(online)].pdf | 2020-08-08 |
| 3 | 202033034075-Written submissions and relevant documents [26-02-2024(online)].pdf | 2024-02-26 |
| 3 | 202033034075-POWER OF AUTHORITY [08-08-2020(online)].pdf | 2020-08-08 |
| 4 | 202033034075-FORM 18 [08-08-2020(online)].pdf | 2020-08-08 |
| 4 | 202033034075-Correspondence to notify the Controller [10-02-2024(online)].pdf | 2024-02-10 |
| 5 | 202033034075-US(14)-HearingNotice-(HearingDate-13-02-2024).pdf | 2024-01-25 |
| 5 | 202033034075-FORM 1 [08-08-2020(online)].pdf | 2020-08-08 |
| 6 | 202033034075-FIGURE OF ABSTRACT [08-08-2020(online)].pdf | 2020-08-08 |
| 6 | 202033034075-DRAWING [02-11-2022(online)].pdf | 2022-11-02 |
| 7 | 202033034075-FER_SER_REPLY [02-11-2022(online)].pdf | 2022-11-02 |
| 7 | 202033034075-DRAWINGS [08-08-2020(online)].pdf | 2020-08-08 |
| 8 | 202033034075-OTHERS [02-11-2022(online)].pdf | 2022-11-02 |
| 8 | 202033034075-DECLARATION OF INVENTORSHIP (FORM 5) [08-08-2020(online)].pdf | 2020-08-08 |
| 9 | 202033034075-COMPLETE SPECIFICATION [08-08-2020(online)].pdf | 2020-08-08 |
| 9 | 202033034075-FER.pdf | 2022-05-26 |
| 10 | 202033034075-COMPLETE SPECIFICATION [08-08-2020(online)].pdf | 2020-08-08 |
| 10 | 202033034075-FER.pdf | 2022-05-26 |
| 11 | 202033034075-DECLARATION OF INVENTORSHIP (FORM 5) [08-08-2020(online)].pdf | 2020-08-08 |
| 11 | 202033034075-OTHERS [02-11-2022(online)].pdf | 2022-11-02 |
| 12 | 202033034075-DRAWINGS [08-08-2020(online)].pdf | 2020-08-08 |
| 12 | 202033034075-FER_SER_REPLY [02-11-2022(online)].pdf | 2022-11-02 |
| 13 | 202033034075-DRAWING [02-11-2022(online)].pdf | 2022-11-02 |
| 13 | 202033034075-FIGURE OF ABSTRACT [08-08-2020(online)].pdf | 2020-08-08 |
| 14 | 202033034075-FORM 1 [08-08-2020(online)].pdf | 2020-08-08 |
| 14 | 202033034075-US(14)-HearingNotice-(HearingDate-13-02-2024).pdf | 2024-01-25 |
| 15 | 202033034075-Correspondence to notify the Controller [10-02-2024(online)].pdf | 2024-02-10 |
| 15 | 202033034075-FORM 18 [08-08-2020(online)].pdf | 2020-08-08 |
| 16 | 202033034075-POWER OF AUTHORITY [08-08-2020(online)].pdf | 2020-08-08 |
| 16 | 202033034075-Written submissions and relevant documents [26-02-2024(online)].pdf | 2024-02-26 |
| 17 | 202033034075-PatentCertificate13-05-2024.pdf | 2024-05-13 |
| 17 | 202033034075-PROOF OF RIGHT [08-08-2020(online)].pdf | 2020-08-08 |
| 18 | 202033034075-STATEMENT OF UNDERTAKING (FORM 3) [08-08-2020(online)].pdf | 2020-08-08 |
| 18 | 202033034075-IntimationOfGrant13-05-2024.pdf | 2024-05-13 |
Search Strategy
| 1 | SS202033034075E_26-05-2022.pdf |