What is a PMSM Motor?

PMSM stands for Permanent Magnet Synchronous Motor. Typically an AC Motor is a more complicated motor that works on alternating current supply. An AC motor is made up of different major parts namely, magnetic field system and permanent magnets which help in field generation. Now when we talk about PMSM Motor which is a type of AC motor. It is a motor that is characterized by its use of permanent magnets to provide the necessary field excitation and thereby generate electricity. To understand it better let us see the construction and operation of PMSM Motor.

Construction of PMSM Motor

Here is the circuit diagram of PMSM Motor

In this circuit we can see how it is made up of stator and rotor. The basic circuit construction includes a AC power source which will produce AC current, the stator which is the stationary part has windings attached to it. We see that the motor also has some permanent magnets attached to it. Apart from the stator and permanent magnets PMSM has some rotors responsible for performing rotations. This is the construction of AC PMSM Motor. The rotor is important since it aligns with the stator to produce energy. Note that the AC power supply is necessary because this motor is not self-starting.

Operation of PMSM Motor

To understand the working of PMSM Motor, see that the stator is initially stationary and rotor is stable. Initially when the AC motor is turned on, the AC power supply is switched on and power flows to the stator part of the circuit. Due to this the stator gets excited due to the flow of energy. After this, the rotor which is made up of magnets gets influenced by the magnetic field of stator. This can be seen by the setting rotating magnetic field which is developed in the air gap between the stator and rotor.

This generated magnetic field then interacts with the magnets in the rotor. The interaction between the rotor and and stator magnet makes the rotator align with the stator windings. Eventually the poles of rotor magnet align with the rotating magnetic field of the stator and starts rotating at the synchronous speed. When the rotor gets aligned with stator magnet, the next winding of stator gets excited. This continuous cycle is created due to which the rotor begins rotating. The direction of this rotation can be calculated using certain laws of electromagnetics. This is how mechanical energy is generated form electrical energy.

BLDC Motor and PMSM Motor form an integral part of the modern-day electronics industry. We know that two types of motors can be used to convert electrical energy into mechanical energy. We talk about these motors when referring to automotive motors. In this article, we will study the motor that uses DC and AC to convert electrical energy into mechanical energy.

Even when dealing with DC motors, we can divide them into certain types like Brushless Direct Current Motor, DC shunt motors, DC series motors, and AC motors like Permanent Magnet Synchronous Motor Motor. In this article, we will focus on Brushless Direct Current Motor and Permanent Magnet Synchronous Motors. We will see the construction and working of each of these types of motors and we will try to analyze the differences between the two. After comparing their work, we will study the Advantages and Disadvantages of the two types of motors.