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Here, the speed regulation of permanent magnet synchronous motors (PMSM) is investigated through feedback dissipative Hamiltonian realisation. Feedback laws for precise and uncertain cases are constructed to transfer the dynamics of PMSM into dissipative Hamiltonian forms. When the load torque is unknown, to realise the speed regulation, an update law is embedded into the dissipative Hamiltonian structure. Simulations show that the controllers designed in this way are efficient.