The starting method for electrically excited synchronous motors is full-voltage starting.If the power grid capacity is insufficient, the voltage can be appropriately reduced to start. The manufacturing complies with GB755 "Basic Technical Requirements for Rotating Electrical Machines" and JB8/DQ3449 "Technical Conditions for TK Series Large Three phase Synchronous Motors".
Large synchronous motors are suitable for use at altitudes not exceeding 1000m and cooling medium temperatures not exceeding 40 degrees. The rated voltage of this series of motors is 6000V, and 3000V and 10000V can also be provided according to user requirements. The allowable voltage deviation range is+5%, the rated power frequency is 50Hz, and the rated power factor is 0.9 (lead).
An electrically excited synchronous machine has a cylindrical shaft extension end, which should rotate in the direction indicated on the sign. The rotation direction is generally counterclockwise when viewed from the collector ring end, but can also be made clockwise according to requirements. When the motor and grinder are connected by a coupling, the motor shaft cannot withstand external radial or axial forces when extended.
The excitation system adopts a controllable silicon excitation device. The electric motor allows direct starting at full voltage. If the user's power grid does not allow direct starting at full voltage, voltage reduction starting can also be used. At this time, the starting current of the motor decreases proportionally to the terminal voltage, and the starting torque decreases proportionally to the square of the terminal voltage. Stator lead wires: There are six lead wires, labeled U1, VI, W1, U2, V2, and W2 respectively. High voltage rubber cables are used to clamp and lead them out from the lower part of the machine base. They can also be made into junction boxes for wiring according to requirements.
The ventilation method can be open natural ventilation or fully enclosed duct ventilation.
Machine base: Made of welded steel plates, the lower part of the machine base is the output end of the motor.
Electrically excited synchronous machine stator: The stator core is made of 0.5mm thick low loss silicon steel sheet punched into a fan-shaped stack, with air ducts separating the core segments. The winding uses formed double stacked short distance coils, with B-level insulation or F-level insulation. The temperature rise is assessed according to B-level to extend the service life. The winding end is reliably fixed and tied, and treated with vacuum pressure immersion solvent-free paint technology. During the manufacturing process, it has undergone multiple turn to turn pulse withstand voltage and ground withstand voltage tests. The motor has excellent and reliable insulation performance, good mechanical strength, and strong anti moisture ability.
Rotor: The magnetic poles are made of steel plates and are mounted on the rotor yoke together with the magnetic pole coils. The magnetic pole coils are insulated with Class B or Class F. When the user uses a pneumatic clutch, the shaft design or shaft drilling form can be customized according to the user's requirements.
Electrically excited synchronous machines are mainly suitable for driving large AC three-phase synchronous motors used in mining mills, mainly driving grid ball mills, rod mills, coal mills, etc.
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