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In spectrum analysis of induction motor current,the characteristic components of broken rotor bars (BRB) fault are often submerged by the fundamental component.Although many detection methods have been proposed for this problem,the frequency resolution and accuracy are not high enough so that the reliability of BRB fault detection is affected.Thus,a new multiple signal classification (MUSIC) algorithm based on particle swarm intelligence search is developed.Since spectrum peak search in MUSIC is a multimodal optimization problem,an improved bare-bones particle swarm optimization algorithm (IBPSO) is proposed first.In the IBPSO,a modified strategy of subpopulation determination is introduced into BPSO for realizing multimodal search.And then,the new MUSIC algorithm,called IBPSO-based MUSIC,is proposed by replacing the fixed-step traversal search with IBPSO.Meanwhile,a simulation signal is used to test the effectiveness of the proposed algorithm.The simulation results show that its frequency precision reaches 10-5,and the computational cost is only comparable to that of traditional MUSIC with 0.1 search step.Finally,the IBPSO-based MUSIC is applied in BRB fault detection of an induction motor,and the effectiveness and superiority are proved again.The proposed research provides a modified MUSIC algorithm which has sufficient frequency precision to detect BRB fault in induction motors.