SURF SRL motor, German SURF SRL model, SURF SRL price

SURF SRL motors are named for their armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series-wound motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide operating voltage range. Speed control via voltage adjustment is simple and easy to implement.

SURF SRL motor maintenance methods

Motor armature removal: Observe whether sparks are generated between the carbon brushes and the commutator during motor operation, and assess the severity of sparking. (1) indicates no sparks at all, meaning the carbon brushes and commutator are normal and require no repair; (2) indicates only 2 to 4 minimal sparks. At this point, carefully observe if the commutator surface is flat. In most cases, repair is unnecessary; (3) indicates that besides r having 4 or more minimal sparks with F, there are also 1 to 3 large sparks. In this case, it is not necessary to remove the armature; simply sand the carbon brushes and commutator; (4) if 4 or more large sparks appear, the commutator must be sanded, or even carefully machined on a lathe. At this point, the carbon brushes and armature must be removed. Of course, once the commutator is machined, the carbon brushes must be replaced and bedded in. Removal method: Since vibration can damage the carbon brushes when removing the end caps and armature, the carbon brushes should first be removed from the brush holders. Also, because the angles of the two brush holders relative to the commutator may not be identical, to ensure restoration to the original state during installation and to prevent left and right carbon brushes from being installed incorrectly, marks must be made on the left and right carbon brushes before removal. Additionally, take care not to damage the contact surfaces between the carbon brushes and the commutator. One end of a high-speed motor generally has a cooling fan, while the other end may have a magnet or tachometer ring for speed measurement. Exercise extreme caution when removing the cooling fan blades, magnet, or tachometer ring to avoid damaging the fan blades or the speed-measuring magnet. Next, make a mark between the fan hub or magnet hub and the shaft so that they can be installed in the original marked positions after repair. Because the dynamic balance test of high-speed motors is performed with the fan blades or tachometer ring (speed-measuring magnet) attached, assembly must follow the marks made during disassembly. This is a minor detail in general motor repair, I but it is critical in high-speed motor repair. If the tachometer ring or fan blades are damaged, or if they are not assembled according to the marks, even if other parts are repaired well, the entire machine may experience unbalanced vibration during high-speed operation. Do not use hammers, punches, or other tools for hard knocking or prying when disassembling high-speed motors; use a puller. When using a puller, note that the tip of the puller must press directly against the center hole, and a protective pad must be placed between the puller tip and the center hole to protect the center hole on the armature shaft from damage. Before disassembly, make marks on the upper and lower end caps to facilitate reassembly in the original configuration after repair. Clean the bearings removed from the armature with care, using clean aviation gasoline. After the gasoline evaporates, fill the bearing housing with 7014 (or 7018) bearing grease (ordinary grease or molybdenum disulfide must not be used for high-speed motor bearings). Place in a clean area for later use. If the commutator surface is flat and has a purple luster, this oxide layer protects the commutator surface; simply remove surface powder with a soft brush.

SURF SRL motor common issues

Motor issues: 1. After the adjustable-speed motor accelerates, the speed gradually drops until it stops. In this situation, observe the changes in the ammeter pointer in the motor's electrical cabinet. If the indicated current increases sharply, overload protection devices such as the main motor's thermal relay will inevitably trip, disconnecting the three-phase power supply and stopping the main motor. Carefully inspect the wiring components in the main motor circuit and the AC contactor of the main motor. Check whether the wiring terminals of all overload protection devices, such as thermal relays in the adjustable-speed motor's electrical cabinet, are loose or have poor contact causing heating. If these issues exist, poor contact between wires and components in the circuit will cause a rapid current increase after the main motor accelerates, triggering protective shutdown. When the adjustable-speed motor runs at low speed, the main motor's operating current is low, so gradual speed drop and shutdown do not occur. However, when the motor accelerates, the high electrical load reveals faults in electrical components. In practice, wiring terminals in the adjustable-speed motor's electrical cabinet may heat up due to poor wire contact, even forming oxide layers at connections, and the wire insulation may burn and discolor. These issues seriously affect the normal operation of the main drive motor. Operators must immediately take appropriate measures, such as cleaning the contact surfaces of wiring terminals and wires, tightening terminal screws, removing burnt oxide layers from wires, and replacing severely damaged wiring terminals. 2. High noise during main drive motor operation. To adjust the dynamic balance of the slip motor, counterweights are installed at both ends of its armature and pole rotor. If these components become slightly loose, the slip motor will deviate from its original position during high-speed rotation. If the fault occurs on the outer surface of the main drive motor, it causes local friction between the armature and the pole rotor, increasing noise. In this case, stop the machine for repair to restore the dynamic balance of the armature and pole rotor, relocate and secure the original dynamic balance counterweights, and ensure the main drive motor operates normally.

SURF SRL motor structure

The motor consists of two basic parts: a stationary stator and a rotating rotor. The rotor is installed inside the stator bore and supported by bearings on two end shields. To ensure the rotor rotates freely within the stator, there must be a gap between the stator and rotor, known as the air gap. The motor's air gap is a critical parameter; its size and symmetry significantly affect motor performance. Figure 2 shows the components of a three-phase squirrel-cage asynchronous motor. The stator consists of a three-phase winding, a stator core, and a frame. The stator three-phase winding is the electrical part of the asynchronous motor and plays a vital role in its operation, being the key component for converting electrical energy into mechanical energy. The structure of the stator three-phase winding is symmetrical, generally with six output terminals U1, U2, V1, V2, W1, W2, located in the junction box on the outside of the frame. Depending on requirements, they are connected in star (Y) or delta (△) configuration. The stator core is part of the asynchronous motor's magnetic circuit. Since the main magnetic field rotates relative to the stator at synchronous speed, the core is laminated from 0.5mm thick high-permeability silicon steel sheets to reduce losses caused in the core. Both sides of the silicon steel sheets are coated with insulating varnish to reduce eddy current losses in the core. The frame, also known as the housing, primarily supports the stator core and withstands the reaction forces generated during full-load operation. Heat generated by internal losses during operation is also dissipated outward through the frame. Frames for medium and small motors are generally made of cast iron. For large motors, where casting is inconvenient due to size, welded steel plates are commonly used.

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