Filter apparatus and frequency converter to which the filter apparatus is connected

• US 20050126811A1
• Filed: 11/12/2004
• Published: 06/16/2005
• Est. Priority Date: 11/14/2003
• Status: Active Grant

• Current Assignee: Hitachi Industrial Equipment Systems Company Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Industrial Equipment Systems Company Limited (Hitachi, Ltd.)
• Inventors: Hirota, Masayuki, Ibori, Satoshi, Hiraga, Masahiro, Takata, Naoki
• Granted Patent: US 7,643,304 B2
• Time in Patent Office: Days
• US Class Current: 174/50.540
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 7/14327 having supplementary functional units, e.g. data transfer modules or displays or user interfaces

Abstract

The invention provides a technique and a product in which for a frequency converter supplying electric power to, for example, a motor, a downsizing, lightening or the like of the frequency converter is realized while providing a filter apparatus reducing electromagnetic noises and the like. The filter apparatus reducing electromagnetic noises and the like is provided near a main circuit terminal board of the frequency converter, and the filter apparatus is connected directly to a main circuit terminal as a wiring drawing portion of the frequency converter. Part of a housing of the frequency converter and part of a filter housing are fitted to each other to fix the filter housing to the frequency converter.

Claims

1. A filter apparatus connected to a wiring drawing portion of a frequency converter, said filter apparatus comprising:

a condenser element having an electronic part having an insulator as a dielectric material held between conductor plates;

a sealing agent sealing said condenser element;

a filter circuit comprising said condenser element;

a connection conductor establishing wiring connections of said filter circuit; and

a filter housing supporting said sealing agent.

2. The filter apparatus according to claim 1, wherein the connection conductor drawn from a side opposite to an opening of said filter housing is connected to the frequency converter on the ground electrode side.

3. The filter apparatus according to claim 1, wherein the connection conductor drawn from a side opposite to a side on which the connection conductor is connected to the wiring drawing portion of said frequency converter is connected to the frequency converter on the ground electrode side.

4. The filter apparatus according to claim 1, wherein said connection conductor covers part of the side face inside said filter housing.

5. The filter apparatus according to claim 1, wherein a wall for preventing said sealing agent from flowing out from a hole for taking the connection conductor on the ground side which is connected to said frequency converter on the ground electrode side is provided.

6. The filter apparatus according to claim 5, wherein if said sealing agent has a high viscosity, a wall for preventing said sealing agent from flowing out from a hole for taking the connection conductor on the ground side which is connected to said frequency converter on the ground electrode side is not provided.

7. The filter apparatus according to claim 1, wherein part of a housing of said frequency converter and part of the filter housing are fitted to each other to fix said filter housing to said frequency converter.

8. The filter apparatus according to claim 1, wherein the filter housing is provided with a fitting portion in which part of the filter housing is fitted to part of the housing of said frequency converter.

9. The filter apparatus according to claim 8, wherein the filter housing is provided with a raised portion fitted to a recessed groove in part of the housing of said frequency converter.

10. The filter apparatus according to claim 8, wherein the filter housing is provided with a recessed groove fitted to a raised portion in part of the housing of said frequency converter.

11. The filter apparatus according to claim 1, wherein said filter apparatus is fixed to said frequency converter based on a positioning portion provided in part of the housing of said frequency converter.

12. The filter apparatus according to claim 11, wherein the raised portion provided in said filter apparatus is interlocked with a hole-like positioning portion provided in part of the housing of said frequency converter to position said filter apparatus in said frequency converter.

13. The filter apparatus according to claim 11, wherein said filter apparatus is abutted against a step-like positioning portion provided in part of the housing of said frequency converter to position said filter apparatus in said frequency converter.

14. The filter apparatus according to claims 11 to 13, wherein an adhesive is used to fix said filter apparatus to the housing of said frequency converter.

15. The filter apparatus according to claims 11 to 13, wherein a screw is used to fix said filter apparatus to the housing of said frequency converter.

16. The filter apparatus according to claims 11 to 13, wherein a Hook-and-Loop is used to fix said filter apparatus to the housing of said frequency converter.

20. The filter apparatus according to claim 1, wherein characteristics of said filter apparatus are based on Class A of EN55011, Class B of EN55011 or the specification of EN61800.

17. A power converter in which a filter apparatus reducing noises is connected to a wiring drawing portion, wherein part of a housing of said frequency converter and part of a filter housing of said filter apparatus are fitted to each other to fix said filter housing to the housing of said frequency converter.

18. The power converter according to claim 17, wherein the housing of said frequency converter is provided with a fitting portion fitted to part of said filter housing.

19. A power converter, comprising:

a filter apparatus reducing noises; and

a frequency converter to which the filter apparatus is connected,

wherein said filter apparatus is connected to a wiring drawing portion of said frequency converter,

part of a housing of said frequency converter and part of a filter housing of said filter apparatus are fitted to each other to fix said filter housing to the housing of said frequency converter.