In this paper, synchronous machines with damper winding are modeled based on the winding function approach [1]. The actual winding distribution is used which does not require neglecting the space harmonics. The skew and slot effects are also taken into account. There are m stator windings, one field winding and n rotor bars which are magnetically coupled in the machine equations. The machine equations are derived in natural reference frame in terms of the actual physical rather than transformed or equivalent variables [2]. The effects of number of broken damper bars on the transient time, slip frequency, torque-speed curve and stator current spectrum are presented. The similarity and dissimilarity of damper bar failures in synchronous machines and broken rotor bars in cage induction machines are discussed.
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