RU2004137847A - METHOD FOR DIAGNOSTIC OF THE STATUS OF THE PLATING PART OF BANDAGE RINGS AND MASSIVE CORE OF THE ELECTRIC MACHINE ROTOR AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Claims (8)

1. A method for diagnosing the condition of the mounting part of the retaining rings and the massive core of the rotor of an electric machine, containing the end part and the core with teeth and grooves, as well as a winding secured in grooves with wedges and insulating spacers, including the detection of cracks on the seating surface of the retaining rings, wear and interference hot-mating surfaces of the retaining ring and rotor core, as well as residual radial deformation of the teeth, without disassembling the retaining assembly using a measuring apparatus ry before putting the electric machine into operation and during operation at subsequent periodic shutdowns to perform an audit of the electric machine, characterized in that the condition of the seat part of the retaining rings and the massive core of the rotor of the electric machine are diagnosed by comparative measurements of the tangential deformations of the inner seat surface of the retainer rings while guaranteeing the absence of wear, and cracks in the retaining ring (Δ ₁ = 0) (initial deformation to start RE cal machine into operation after its manufacture or overhaul - baseline period) and deformation diagnosed period in operation at the next stop it (Δ _2), and the formation of cracks, wear, changes in the landing interference and the residual radial deformation of the teeth is determined by the change of the tangential strain the inner seating surface of the retaining rings on a stopped electric machine (Δ ₂ -Δ ₁ ), while if the value (Δ ₂ -Δ ₁ ) is negative, i.e. if compression strain is fixed, then this determines the weakening of the fit of the retaining rings on the rotor core due to wear and the possible formation of cracks on the fit of the retaining rings, if the value (Δ ₂ -Δ ₁ ) is positive, i.e. If the tensile strain is fixed, then this determines the residual radial tensile strain of the teeth of the rotor core and possibly the residual tangential deformation of the retaining ring, resulting from the fact that the electric machine worked in abnormal mode, for example, with an ultra-nominal speed. 2. The method according to claim 1, characterized in that when diagnosing the formation of cracks on the inner landing part of the retaining ring from the total change in the tangential deformation of this surface (Δ ₂ ), the component (Δ _{2 wear} ) due to wear during operation of the mated electric machine is excluded the surfaces of the retaining ring, the teeth of the rotor core and insulating gaskets, determined by the change in the outer diameter of the retaining ring (ΔD _b = D _b2 -D _b1 ) in the diagnosed period (D _b2 ) compared to the base period house (D _b1 ) by the formula Δ _{2 wear} = π · Δ _{D b.} , and the total value of crack opening is determined by the ratio Δ _{2 cracks} = | Δ ₂ | - | ΔD _b |. 3. The method according to claim 1, characterized in that the change in the magnitude of the seating interference fit (Δb) of the retaining rings on the rotor barrel in the diagnosed period is made according to the results of changes in the tangential deformations of the inner seating surface of the retaining rings and the outer diameter of the rotor core (ΔD _c = D _c2 - D _c1 ), measured in the area of its interface with the retaining ring, in comparison with the measurements taken in the base period, using the ratio

while the actual value of the seating interference of the retaining ring on the rotor core is determined by the ratio δ _fact. = δ _normal -Δδ, where is the _fact. - the actual value of the seating interference of the retaining rings; b _norms. - standard (initial) value of the interference fit; Δ ₂ and Δ ₁ - respectively, the tangential deformation of the inner landing part of the retaining rings in the diagnosed and base period. 4. A device for implementing the method according to any one of claims 1 to 3, characterized in that for diagnosing the condition of the seat portion of the retaining rings and the massive core of the rotor on the inner seating surface of the retaining rings mounted on the rotor barrel, in places opposite the rotor grooves, strain gauges, for example strain gauges, are fixed. 5. The device according to claim 4, characterized in that the strain gauges are also installed in the seating area of the retaining rings on the shoulders of the teeth of the core and are fixed with groove wedges. 6. The device according to claim 4, characterized in that the strain gauges are also installed in the seating area of the retaining rings on the outer surface of the teeth of the core under the insulating gasket. 7. The device according to any one of claims 4 to 6, characterized in that at least in the part of the end grooved wedges of the rotor are made longitudinal channels through which the sensors for measuring tangential deformations are installed in the landing part of the retaining ring and wired to external measuring contacts that are fixed in groove wedges. 8. The device according to any one of claims 4 to 6, characterized in that the wiring from the tangential strain measuring sensors is conducted through the space under the retaining rings to the external measuring contacts installed in the end parts of the rotor.