GB2000396A - Frequency changer circuit for synchronous machines - Google Patents
Frequency changer circuit for synchronous machinesInfo
- Publication number
- GB2000396A GB2000396A GB7826685A GB7826685A GB2000396A GB 2000396 A GB2000396 A GB 2000396A GB 7826685 A GB7826685 A GB 7826685A GB 7826685 A GB7826685 A GB 7826685A GB 2000396 A GB2000396 A GB 2000396A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motors
- inverter
- frequency
- members
- control element
- 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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
- Motor And Converter Starters (AREA)
- Control Of Multiple Motors (AREA)
Abstract
A frequency changer circuit 10 for supplying one or more synchronous electrical machines, as shown groups 1 to 4 of hysteresis motors driving high speed centrifuges, is provided with power storage members 14, 15, 16 and a frequency control element 17 for controlling the frequency of the inverter 12. The motors are connected to the inverter via switches 5-8. It is necessary to protect the motors from overloading, when one or more of the groups is switched on or off. To this end means 21, 22 are provided for sensing when the inverter voltage rises above a predetermined response level and a member 23 supplies a transient signal Figure 3 (not shown) to the frequency control element 17 when this level is exceeded to cause the motors to be briefly changed over from synchronous to asynchronous operation, thus increasing the power requirement of the motors. The member 23 causes the inverter frequency to increase suddenly by a preset amount, so that the power surplus in members 14, 15, 16 is absorbed by the motors to reduce the transient overvoltage produced by switching the motor group(s). Further reduction is possible by decreasing the voltage of rectifier 13 through members 19, 28 also controlled by member 22. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2726534A DE2726534C2 (en) | 1977-06-13 | 1977-06-13 | Converter circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2000396A true GB2000396A (en) | 1979-01-04 |
GB2000396B GB2000396B (en) | 1982-01-06 |
Family
ID=6011392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7826685A Expired GB2000396B (en) | 1977-06-13 | 1978-06-12 | Transverter circuit |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS547126A (en) |
DE (1) | DE2726534C2 (en) |
GB (1) | GB2000396B (en) |
NL (1) | NL7806416A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2356068A (en) * | 1999-11-05 | 2001-05-09 | Urenco Deutschland Gmbh | Method for operating and controlling hysteresis motors |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3029358A1 (en) * | 1980-08-01 | 1982-03-11 | Siemens AG, 1000 Berlin und 8000 München | DEVICE FOR BRIDGING SHORT-TERM NETWORK OUTPUTS FOR INTERMEDIATE VOLTAGE CONVERTERS |
DE3707336A1 (en) * | 1987-03-07 | 1988-09-15 | Zinser Textilmaschinen Gmbh | Arrangement for supplying at least one AC or DC motor |
-
1977
- 1977-06-13 DE DE2726534A patent/DE2726534C2/en not_active Expired
-
1978
- 1978-06-12 GB GB7826685A patent/GB2000396B/en not_active Expired
- 1978-06-13 JP JP7143578A patent/JPS547126A/en active Pending
- 1978-06-13 NL NL7806416A patent/NL7806416A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
None * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2356068A (en) * | 1999-11-05 | 2001-05-09 | Urenco Deutschland Gmbh | Method for operating and controlling hysteresis motors |
GB2356068B (en) * | 1999-11-05 | 2003-11-12 | Urenco Deutschland Gmbh | Method for operating and controlling hysteresis motors |
Also Published As
Publication number | Publication date |
---|---|
GB2000396B (en) | 1982-01-06 |
DE2726534C2 (en) | 1979-07-12 |
DE2726534B1 (en) | 1978-11-09 |
JPS547126A (en) | 1979-01-19 |
NL7806416A (en) | 1978-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |