GB1242285A - An inverter controlled motor drive for machines with a fractional speed range - Google Patents
An inverter controlled motor drive for machines with a fractional speed rangeInfo
- Publication number
- GB1242285A GB1242285A GB4630168A GB4630168A GB1242285A GB 1242285 A GB1242285 A GB 1242285A GB 4630168 A GB4630168 A GB 4630168A GB 4630168 A GB4630168 A GB 4630168A GB 1242285 A GB1242285 A GB 1242285A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- current
- inverter
- speed
- speed range
- 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.)
- Expired
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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/048—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using AC supply for only the rotor circuit or only the stator circuit
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
1,242,285. Control of A.C. motors. LICENTIA PATENT - VERWALTUNGS - G.m.b.H. 30 Sept., 1968 [29 Sept., 1967], No. 46301/68. Heading H2J. [Also in Division G3] In an inverter controlled motor drive for a machine which is to be operated in a speed range which is a fraction (e.g. 30%) of the whole rated speed range of the motor and which requires a torque falling with the speed, the motor being fed with variable voltage and frequency by a forced commutated inverter-the motor is designed and constructed with such a relatively small stator/rotor air gap and air gap flux density and is supplied with such a low magnetization current that over the whole said fractional speed range, with the inverter output voltage maintained constant, the motor current including no load current is never greater than the motor current at the rated speed of the motor. Compared with the motor designed to operate at the normal rated full speed, the present motor has an increased number of stator turns in order that it will operate .at a specific applied voltage with reduced flux density and magnetizing current. This increases the back e.m.f. of the motor which is said to reduce harmonics in the inverter current. Also the short circuit reactance of the motor is increased and further limits overload peaks occurring across the thyristors at the moments of forced commutation. As shown, Fig. 1, the inverter is supplied with rectified constant voltage Ud via a smoothing or buffer capacitor C. Each of the controlled rectifier cells 1 to 6 comprises thyristors connected as shown in Fig. la and a quenching capacitor. Diodes 7 to 12 pass reactive current. The speed of the motor M is compared with a desired value in a known manner in a control unit St which controls the firing and quenching of the thyristors accordingly.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1638415 | 1967-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1242285A true GB1242285A (en) | 1971-08-11 |
Family
ID=5683902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4630168A Expired GB1242285A (en) | 1967-09-29 | 1968-09-30 | An inverter controlled motor drive for machines with a fractional speed range |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR1581928A (en) |
| GB (1) | GB1242285A (en) |
-
1968
- 1968-09-26 FR FR1581928D patent/FR1581928A/fr not_active Expired
- 1968-09-30 GB GB4630168A patent/GB1242285A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1581928A (en) | 1969-09-19 |
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