The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets
The variable speed electrical drives for industrial mechanisms with a constant static torque usually operate in a large range of speeds and loads. Along with this, for any speed of a given range the electrical drive motor is to provide a continuous permissible torque without overheating. Mostly the...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Belarusian National Technical University
2018-12-01
|
| Series: | Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика |
| Subjects: | |
| Online Access: | https://energy.bntu.by/jour/article/view/1406 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832543759436349440 |
|---|---|
| author | B. I. Firago S. V. Aleksandrovsky |
| author_facet | B. I. Firago S. V. Aleksandrovsky |
| author_sort | B. I. Firago |
| collection | DOAJ |
| description | The variable speed electrical drives for industrial mechanisms with a constant static torque usually operate in a large range of speeds and loads. Along with this, for any speed of a given range the electrical drive motor is to provide a continuous permissible torque without overheating. Mostly the electrical motors have self-ventilation; the ventilator being located on the motor shaft. In such motors heat dissipation depends on a motor speed. The permissible continuous motor torque is determined out of a heat balance equation where power losses being converted into heat must be transferred in the ambient space and the motor temperature must not be over a permitted level for a given class of winding insulation under the certain ambient temperature. A heat balance equation is usually obtained on a basis of a one-mass motor heat model, i. e. the model that was used in this research. But even the one-mass heat model gives a non-linear heat balance equation. In order to get convenient analytical expressions out of the motor heat balance equation, it is necessary to take some justified assumptions; the latter was also implemented in this research. As a result, formulas have been obtained by which the long-term permissible motor torque can be calculated as a function of the relative speed of the rotor at a given ambient temperature. For the examples presented in the articles we chose (20 and 40 °С as a standard temperature for the thermal calculation of electrical machines). Dependences of a relative permissible continuous motor torque m on a relative frequency value (or relative rotor speed) are presented for three synchronous motors with permanent magnets and rated power of 3; 25 and 250 kW. |
| format | Article |
| id | doaj-art-277ff7d684ea4743b0de575dbf659a2c |
| institution | Kabale University |
| issn | 1029-7448 2414-0341 |
| language | Russian |
| publishDate | 2018-12-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика |
| spelling | doaj-art-277ff7d684ea4743b0de575dbf659a2c2025-02-03T11:34:16ZrusBelarusian National Technical UniversityИзвестия высших учебных заведений и энергетических объединенний СНГ: Энергетика1029-74482414-03412018-12-0161650851610.21122/1029-7448-2018-61-6-508-5161350The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent MagnetsB. I. Firago0S. V. Aleksandrovsky1Belarusian National Technical UniversityBelarusian National Technical UniversityThe variable speed electrical drives for industrial mechanisms with a constant static torque usually operate in a large range of speeds and loads. Along with this, for any speed of a given range the electrical drive motor is to provide a continuous permissible torque without overheating. Mostly the electrical motors have self-ventilation; the ventilator being located on the motor shaft. In such motors heat dissipation depends on a motor speed. The permissible continuous motor torque is determined out of a heat balance equation where power losses being converted into heat must be transferred in the ambient space and the motor temperature must not be over a permitted level for a given class of winding insulation under the certain ambient temperature. A heat balance equation is usually obtained on a basis of a one-mass motor heat model, i. e. the model that was used in this research. But even the one-mass heat model gives a non-linear heat balance equation. In order to get convenient analytical expressions out of the motor heat balance equation, it is necessary to take some justified assumptions; the latter was also implemented in this research. As a result, formulas have been obtained by which the long-term permissible motor torque can be calculated as a function of the relative speed of the rotor at a given ambient temperature. For the examples presented in the articles we chose (20 and 40 °С as a standard temperature for the thermal calculation of electrical machines). Dependences of a relative permissible continuous motor torque m on a relative frequency value (or relative rotor speed) are presented for three synchronous motors with permanent magnets and rated power of 3; 25 and 250 kW.https://energy.bntu.by/jour/article/view/1406synchronous motorfrequency controlpermissible torqueheat balance equation |
| spellingShingle | B. I. Firago S. V. Aleksandrovsky The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика synchronous motor frequency control permissible torque heat balance equation |
| title | The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets |
| title_full | The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets |
| title_fullStr | The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets |
| title_full_unstemmed | The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets |
| title_short | The Permissible under Heating Conditions Torque of a Frequency-Controlled Synchronous Motor of Permanent Magnets |
| title_sort | permissible under heating conditions torque of a frequency controlled synchronous motor of permanent magnets |
| topic | synchronous motor frequency control permissible torque heat balance equation |
| url | https://energy.bntu.by/jour/article/view/1406 |
| work_keys_str_mv | AT bifirago thepermissibleunderheatingconditionstorqueofafrequencycontrolledsynchronousmotorofpermanentmagnets AT svaleksandrovsky thepermissibleunderheatingconditionstorqueofafrequencycontrolledsynchronousmotorofpermanentmagnets AT bifirago permissibleunderheatingconditionstorqueofafrequencycontrolledsynchronousmotorofpermanentmagnets AT svaleksandrovsky permissibleunderheatingconditionstorqueofafrequencycontrolledsynchronousmotorofpermanentmagnets |