Synchronous motors are applied on applications that require power factor correction, low starting currents and high torques, and constant speed under load variations with low operating and maintenance costs.
- Output: up to 110,000 kW
- Frame: 280 to 1800 (IEC)
- Voltage: 220 to 15,000 V
- Degree of protection: IP23 to IP56W/IP65W
- Speed: 3,600 to 150 rpm
Synchronous motors with brushless excitation system present a rotating exciter, normally located in a compartment in the back of the motor. Depending on the motor operation, the exciter is composed by:
- Exciter with direct current supply on the stator
- Exciter with alternating current supply on the stator
The exciter rotor supplies the necessary power to the motor excitation winding through a rotating, three-phase rectifier bridge.
Exciter Rectification Circuit for Brushless Motors
The field application control circuit of the rectification system uses microprocessors to determine the best angle and phase for field application. The Sync-Rite™ system is a high-performance, digitally controlled module developed by WEG Electric Machinery. As an option, a portable Sync-Rite™ testing device can be supplied for easy verification of the circuit electronic components, without the need of disassembling the circuit.
Static Exciter (With Brushes)
Synchronous motors with static exciter are designed with slip rings and brushes that allow the current supply to reach the rotor poles by means of sliding contact. The direct current must come from an AC/DC static controller and converter located outside the motor. Synchronous motors with static exciter are more often used in applications with variable speed with a frequency drive operation or in applications where the system dynamic response must be extremely fast.
Design of the Parts
- More spacing and greater airflow on the coil heads and bearings
- Cooling system with ducts, more efficient and optimized
- Integration of the rectifying circuit to the exciter, enhancing the robustness of the excitation system
Synchronous motors are manufactured specifically to meet the needs of each application. Due to their construction features, operation with high performance and adaptability to all types of environment, they are virtually used in all industry sectors, such as: Mining, Steel, Paper & cellulose, Sanitation, Oil & Gas, Cement, Rubber, Energy Transmission and others.