The reluctance motor

The reluctance motor

The reluctance motor is arguably the simplest synchronous motor of all, the rotor consisting of a set of iron laminations shaped so that it tends to align itself with the field produced by the stator.

The stator winding is identical to that of a three-phase induction motor. The rotor is different, containing saliency which provides a preferred path for the flux. This is the feature which tends to align the rotor with the rotating magnetic field, making it a form of synchronous machine. In order to start the motor a form of cage needs to be incorporated into the rotor design, and the motor can then start as an induction motor. Once a higher speed is reached, the reluctance torque ‘pulls in’ the rotor to run synchronously in much the same way as a permanent magnet rotor.

Reluctance motors may be used on both fixed frequency supplies and inverter supplies. These motors tend to be one frame size larger than a similarly rated induction motor and have a low power factor (perhaps as low as 0.4) and poor pull-in performance. As a result, their industrial use has not been widespread except for special applications such as textile machines where large numbers of reluctance motors may be connected to a single ‘bulk’ inverter and may maintain synchronism. Even in this application, as the cost of inverters has reduced, bulk inverters are infrequently used and the reluctance motor is now rarely seen.

Related posts:

Motor-Generator Set:System Configuration
Electricity and potentially explosive atmospheres:Equipment installation
Drive power circuits.
Power Factor and Dissipation Factor Testing Methods:Basic Test Connections (Test Modes) for PF Testi...
Electrical Power System Grounding and Ground Resistance Measurements:Understanding Ground Resistance
Transformers:Network Transformers
Voltage Regulation:Voltage Standards
COMBINED HEAT AND POWER:COMBINED HEAT AND POWER PRINCIPLES AND APPLICATIONS
FUEL CELLS:HISTORY OF FUEL CELLS
POWER FROM WASTE:WASTE POWER GENERATION TECHNOLOGIES
Electro-Thermal Model of Power Semiconductors Dedicated for Both Case and Junction Temperature Estim...
General Overview:Investment in Energy Infrastructure
The Current Situation and Perspectives on the Use of Renewable Energy Sources for Electricity Genera...
The Current Situation and Perspectives on the Use of Wind Energy for Electricity Generation:The Situ...
The Current Situation and Perspectives on the Use of Nuclear Energy for Electricity Generation:The E...

Leave a comment

Your email address will not be published. Required fields are marked *