HIGH-EFFICIENCY AND ENERGY-SAVING PERMANENT MAGNET SYNCHRONOUS MOTOR

摘要

A permanent magnet synchronous (PMS) motor includes a stator (3), a rotor (2) which can rotate relative to the stator (3), at least a pair of permanent magnets (1) distributed over the rotor system (2), magnetic isolation blocks (25) in between the two permanent magnets (1), and the protection magnetic circuits (4) over the rotor (2) and in between the permanent magnet (1) and the magnetic isolation block (25). The permanent magnet (1) is used to produce magnetic source. The protection magnetic circuit (4) produces far less magnetic resistance than the internalmagnetic resistance of permanent magnet (1). At the time of the start or shut-down of the motor or during the motor operation, the permanent magnets (1) can generate magnetic flux shock wave as a result of the transient mutation of the power grid, and the protection magnetic circuit (4) of the motor can release the magnetic flux shock wave in such a way that the permanent magnets (1) can always work in the safe zone of the permanent magnet demagnetization curve, which effectively protects the permanent magnets (1) in the motor. The PMS motor improves system reliability and character stability and extends the useful life of the motor.