Symbol	Definition
AI	Artificial Intelligence
BBF	Broken Bar Fault
BBR	Broken Bar
EMD	Empirical Mode Decomposition
EMF	Electromotive Forces
ESPRIT	Estimation of Signal Parameters via Rotational Invariance Techniques
FC	Fundamental Current Component
FEM	Finite Element Method
FFT	Fast Fourier Transform
HBBR	Half-Broken Bar
HHT	Hilbert–Huang transform
MCSA	Motor Current Signature Analysis
MUSIC	Multiple Signal Classification
NEMA	National Electrical Manufacturers Association
RLSH	Left-Side Harmonic
RMS	Root Mean Square
RSH	Right Sideband Harmonic
SNR	Signal To Noise Ratio
WT	Wavelet Transform
$E_{1-2s}$ and $E_{1+2s}$	The RMS of electromotive force of the LSH and RSH respectively
$e_{1-2s}$ $\mathrm{and} e_{1+2s}$	The instantaneous of electromotive force of the LSH and RSH respectively
$f$	The supply frequency
$f_r$	Rotor frequency component
$I_a$	The stator current
$J$	System inertia
$I,I_l$ and $I_r$	The RMS of fundamental current, LSH and RSH components respectively
$i_1^{\prime }, i_2, i_1^{‴}, i_2^{\prime }, i_2^{″}$ and $i_1^{″}$	Notations for different current components, where subscript (1) and (2) indicate components related to LSH and RSH respectively
$i_1^o$	Initial left sideband current
$i_1^o{}_{mcorrected}$	The corrected values of $i_1^o$
$P$	Number of poles
$s$	Motor slip
$\omega$	Synchronous speed
$Z_{1-2s}$ and $Z_{1+2s}$	The circuit impedance for LSH and RSH respectively
$Z$ and $\varphi$	The magnitude and the angle of the equivalent circuit impedance at supply frequency
$\alpha , {\alpha }_l$ and ${\alpha }_r$	The phase angles of FC, LSH, and RSH
${\alpha }_{\lambda }$	The angle of the fundamental flux linkage
$\beta$	A parameter equals $\frac{3{P\lambda }^2}{8Js\omega \left|Z\right|}$
${\theta }_1^{″}$ and ${\theta }_2^{″}$	The phase angle of the current components $i_1^{″}\mathrm{and} i_2^{″}$, respectively
$\Delta \theta$	The change in the angle $\theta$
$\lambda$	The RMS value of the fundamental flux linkage
${\lambda }_{fund}$	The instantaneous value of the fundamental flux linkage
${\dots }_r$	The subscript$\left(r\right)$ denotes reference cases
${\dots }_{new}$	The subscript$\left(new\right)$ denotes new cases
${\dots }_{\mathrm{mnew}}$	$\mathrm{The} \mathrm{subscript} \left(\mathrm{mnew}\right)$ indicates the new case current components calculated using the model in Figure 2
${\dots }_m$	The subscript (m) indicates the model indicates the model