The more widely used permanent magnet synchronous motor PMSM (Permanent Magnet Synchronous Motor) is a kind of synchronous motor. Note that synchronization here does not mean that the rotor speed is synchronized with the rotation speed of the stator magnetic field, because the rotor speed is related to how many pairs of magnetic poles it has. If it is a pair of magnetic poles, then the rotation speed of the rotor is equal to the rotation speed of the stator magnetic field. If the stator has two pairs of poles, then it rotates at half the speed of the stator’s magnetic field.
In the embedded field, most of the DC motors are used. Let’s disassemble some commonly used ones to get an intuitive feeling. Brushed DC Motor, Brushed DC Motor. The stator is a permanent magnet, and the rotor is a coil. After electrification, the coil rotates under the action of the magnetic field. After turning a certain angle, the electrified electrodes switch, and the rotor continues to rotate under the force of the new electrified coil. Its control is very simple, it turns when it is powered on with direct current, and the direction of rotation is also reversed after the polarity is switched on, and the speed changes with the voltage.