What Is The Permanent Magnet Synchronous Motor?
The PERMANENT MAGNET SYNCHRONOUS MOTOR is mainly composed of the
stator, rotor, chassis, front-rear cover, bearings, etc. The
structure of the stator is basically the same as that of ordinary
asynchronous motors, and the main difference between the permanent
magnet synchronous motor and other kinds of motors is its rotor.
The permanent magnet material with pre-magnetized (magnetic
charged) magnetic on the surface or inside the permanent magnet of
the motor, provides the necessary air gap magnetic field for the
motor. This rotor structure can effectively reduce the motor
volume, reduce loss and improve efficiency.
Analysis of the principle of the technical advantages of permanent
magnet motor
The principle of a permanent magnet synchronous motor is as
follows: In the motor's stator winding into the three-phase
current, after the pass-in current, it will form a rotating
magnetic field for the motor's stator winding. Because the rotor is
installed with the permanent magnet, the permanent magnet's
magnetic pole is fixed, according to the principle of magnetic
poles of the same phase attracting different repulsion, the
rotating magnetic field generated in the stator will drive the
rotor to rotate, The rotation speed of the rotor is equal to the
speed of the rotating pole produced in the stator.
Due to the use of permanent magnets to provide magnetic fields, the
rotor process is mature, reliable, and flexible in size, and the
design capacity can be as small as tens of watts, up to megawatts.
At the same time, by increasing or decreasing the number of pairs
of rotor permanent magnets, it is easier to change the number of
poles of the motor, which makes the speed range of permanent magnet
synchronous motors wider. With multi-pole permanent magnet rotors,
the rated speed can be as low as a single digit, which is difficult
to achieve by ordinary asynchronous motors.
Especially in the low-speed high-power application environment, the
permanent magnet synchronous motor can be directly driven by a
multi-pole design at low speed, compared with an ordinary motor
plus reducer, the advantages of a permanent magnet synchronous
motor can be highlighted.
