High Efficiency Permanent Magnet Synchronous Motor IP54 High Torque Density
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High Torque Density High Efficiency Permanent Magnet Synchronous Motor
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.
Detailed pictures Working of Permanent Magnet Synchronous Motor:
The working of the permanent magnet synchronous motor is very simple, fast, and effective when compared to conventional motors. The working of PMSM depends on the rotating magnetic field of the stator and the constant magnetic field of the rotor. The permanent magnets are used as the rotor to create constant magnetic flux, operate, and lock at synchronous speed. These types of motors are similar to brushless DC motors.
The phasor groups are formed by joining the windings of the stator with one another. These phasor groups are joined together to form different connections like a star, Delta, and double and single phases. To reduce harmonic voltages, the windings should be wound shortly with each other.
When the 3-phase AC supply is given to the stator, it creates a rotating magnetic field and the constant magnetic field is induced due to the permanent magnet of the rotor. This rotor operates in synchronism with the synchronous speed. The whole working of the PMSM depends on the air gap between the stator and rotor with no load.
If the air gap is large, then the windage losses of the motor will be reduced. The field poles created by the permanent magnet are salient. The permanent magnet synchronous motors are not self-starting motors. So, it is necessary to control the variable frequency of the stator electronically.
Advantages
The advantages of permanent magnet synchronous motor include: provides higher efficiency at any speed available in small sizes at different packages maintenance and installation is very easier than an induction motor capable of maintaining full torque at low speeds high efficiency and reliability gives smooth torque and dynamic performance
Disadvantages
The disadvantages of permanent magnet synchronous motors are: These type of motors are very expensive when compared to induction motors Somehow difficult to start-up because they are not self-starting motors.
EMF and Torque Equation:
In a synchronous machine, the average EMF induced per phase is called dynamic induces EMF in a synchronous motor, the flux cut by each conductor per revolution is Pϕ Weber Then the time taken to complete one revolution is 60/N sec
The average EMF induced per conductor can be calculated by using
( PϕN / 60 ) x Zph = ( PϕN / 60 ) x 2Tph
Where Tph = Zph / 2
Therefore, the average EMF per phase is,
= 4 x ϕ x Tph x PN/120 = 4ϕfTph Where Tph = no. Of turns connected in series per phase
ϕ = flux/pole in Weber
P= no. Of poles
F= frequency in Hz
Zph= no. Of conductors connected in series per phase. = Zph/3
The EMF equation depends on the coils and the conductors on the stator. For this motor, the distribution factor Kd and pitch factor Kp are also considered.
Hence, E = 4 x ϕ x f x Tph xKd x Kp
The torque equation of a permanent magnet synchronous motor is given as,
T = (3 x Eph x Iph x sinβ) / ωm
Surface-mounted PMSM In this construction, the magnet is mounted on the surface of the rotor. It is suited for high-speed applications, as it is not robust. It provides a uniform air gap because the permeability of the permanent magnet and the air gap is the same. No reluctance torque, high dynamic performance, and suitable for high-speed devices like robotics and tool drives.
Buried PMSM or Interior PMSM In this type of construction, the permanent magnet is embedded into the rotor as shown in the figure below. It is suitable for high-speed applications and gets robust. Reluctance torque is due to the saliency of the motor. |
| Product Tags: Permanent Magnet Synchronous Motor Permanent Magnet Synchronous Motor High Efficiency Permanent Magnet Motor |
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