A standard PMSM needs a drive system in order to operate. There are different types of drives like the PAM drive and PWM drive. The objective of this document is to demonstrate the performance of a PMSM while using Pulse Amplitude Modulation or PAM drive. The principle of a PAM drive is simple, a carrier signal cuts through the supply signal to create pulses, the amplitude of these pulses can be controlled by controlling the amplitude of the supply signal.
Module: DP | 2018-04
Electrical faults are a commonly occurring conditions during operation of machines. These can cause an adverse effect on the power electronics or the power system connected to these machines. It is necessary to run many test cases with changing fault conditions for a comprehensive analysis of motor behavior during a fault. JMAG-RT Model can simulate the effect of harmonics on the system and magnetic saturation effect that are calculated from FEA.
Module: DP, RT | 2018-04
Primary power loss drivers in PM machines are iron, magnets and the winding. The main focus of this analysis is the winding losses, particularly those which occur in the end winding. The flux patterns occurring in the end winding region are different from those within the core winding length. These losses can be defined by their two components namely DC and AC losses , DC winding loss is easily analyzed by circuit analysis of the windings and are within the realm of arithmetic calculation.
Module: TR | 2018-04
Along with the development of electric vehicles, demands are increasing for a balance in trade-offs between low speed-high torque and high speed within permanent magnet motors. For that reason, research into the variable flux motors capable of obtaining the magnetic force necessary for high torque and the ability to reduce induced voltage within high speed rotation regions has been actively studied in recent years.
Module: DP | 2018-04
In the IPM motor, a permanent magnet is embedded in the rotor along with a flux barrier. The purpose of the flux barrier is to prevent the magnetic flux of the magnet from penetrating the adjacent magnetic pole and to efficiently convert the magnetic force into torque. Therefore, in order to increase the magnetic resistance of the magnetic path to the adjacent pole, it is desirable from the viewpoint of improving the torque to make the bridge portion thin.
Module: DP, DS | 2018-04
Magnets are used in motors and display large variation in their properties verse temperature. For rare earth magnets at temperatures in the hundreds of degrees demagnetization can occur. Since the presence or absence and degree of demagnetization are determined by a combination of the demagnetizing field and the temperature applied, it is necessary to pay attention to magnetic circuit design in addition to the heat resistance of the magnet itself.
Module: DP, ST | 2018-04
Traditionally, motor control design and design of the motor itself have mostly been performed independently, and cooperative designs have been difficult to carry out. Also, for advanced motor control design, a motor model showing more details and conformity to the behavior of the actual machine is required by control simulation. In JMAG, it is possible to create a detailed model that conforms to the actual machine as well as account for spatial harmonics and magnetic saturation characteristics that are included in the motor.
Module: DP, RT | 2018-04
Motors used in electric vehicles are generally quieter than engines, but vibration and noise may be a problem because the drive range is wide. This vibration and noise also occur due to electromagnetic excitation forces and eigenmode resonances of the motor. Among the electromagnetic excitation forces, for the radial force acting on the teeth the second harmonic becomes dominant as the magnet passes by two poles in one electrical angle.
Module: DP, RT | 2018-04
The square wires and flat wires of segment coils and edgewise coils, etc., are being used for the purpose of improving lamination factors, the reduction of end parts, minimization, improvements in heat dissipation, and improvements in productivity in IPM motors. On the other hand, from the viewpoint of higher efficiency and increasing output, etc., motor coil resistance to loss is becoming a necessity as so to obtain a reduction of loss in electrical appliances in general.
Module: DP | 2018-04
To realize high output and efficiency in a motor, it will be important to understand temperature increase in each part of the motor. This is because coil resistance and magnet characteristics change with increase in temperature, and this may cause a large impact in the motor characteristics.
Module: DP | 2016-06
Recently, PM motors are being applied in home appliances and electric automobiles, and the demand for compactness and high power is increasing. On the other hand, small and high-power motors tend to be affected by high-frequency components due to magnetic saturation and high rotations, which results...
Module:DP, LS | 2014-12
PM synchronous motors are used in HEV drives, air conditioner compressors, and various other industries. Especially in case of PM synchronous motors for HEV drives, high-speed rotation is advancing faster than ever to achieve a small size with high output density.
Module:DP, LS | 2018-01
The purpose of this Application Note is to help JMAG users understand the steps and settings used in a JMAG analysis. It is intended to help those who are working with a new analysis target better understand the analysis steps and the setting contents.
Module:DP | 2014-05
Demand for higher efficiency and smaller size in motors has grown from the need to accommodate devices that incorporate miniaturization and energy efficiency in their designs. In order to meet this demand, motors have to improve their output density and reduce their losses.
Module:DP, LS | 2017-02
IPM motors use rare earth sintered permanent magnets because they have strong magnetic energy. They can use the magnetic torque from the magnet's field and the rotating magnetic field in addition to the reluctance torque that originates from the difference in inductance between the d-axis and q-axis,...
Module:DP,LS,RT | 2017-10
It is becoming increasingly common for permanent magnet motors to use rare earth magnets in order to achieve higher output density because they have a high energy product. Neodymium rare earth magnets have a high electric conductivity because they contain a great deal of iron, so when a varying magnetic field...
Module:DP, FQ | 2014-10
IPM motors are often used as high performance motors because they are highly efficient and their structure makes it possible to achieve a wide range of operation. They are able to achieve high efficiency because they obtain maximum total torque by using their controls to adjust their magnet and reluctance torques.
Module:DP | 2012-04
Smaller size and higher output are being demanded of the motors used for applications such as air conditioning compressors. One production technique for achieving this is a higher lamination factor in divided cores. The stress caused by press-fitting a divided stator core into a frame is known to increase iron loss...
Module:DP,DS,LS | 2013-02
Motors driven by PWM inverters are widely used in household appliances. It is known that when a PWM inverter is used for drive, common mode current flows and axial voltage is produced in the motor's bearings. Electric corrosion is caused in the bearings by this axial voltage, which can reduce the motor's...
Module:EL | 2013-10
Evaluating the inductance characteristics along the d/q-axis is important when analyzing the saliency of a rotor in an IPM motor. With actual measurements, it is possible to calculate the inductance in the d-axis and q-axis by measuring the no-load magnetic flux or the voltage and current with a three-phase current flowing...
Module:DP | 2013-10
One of the demands for IPM motors is higher efficiency over a wide range of rotation speeds in combination with motor drives, as reluctance torque can be used in addition to magnet torque. Iron loss makes up a particularly large proportion of total loss in the high rotation region, and how to make this smaller is a major design...
Module:DP, DS, LS | 2017-10
Current vector controls are generally used in interior permanent magnet synchronous motors (hereinafter referred to as IPMs), and among them PWM inverters are widely utilized to create a command current. It is vital to get a good understanding of iron losses in order to raise the efficiency of an IPM motor.
Module:DP, LS | 2012-04
Magnetic steel sheet is used for the cores of drive motors for HEVs and EVs. This is to make them more compact, lighter, and more efficient. The main point for improving efficiency in an IPM motor's high rotation speed region is how to reduce iron loss. However, shrink fitting is used in order to strengthen...
Module:DP,DS,LS | 2017-10
Demand for higher efficiency and smaller size in motors has grown from the need to accommodate devices that incorporate miniaturization and energy efficiency in their designs. In order to meet this demand, motors have to improve their output density and reduce their losses. One type of loss commonly found in motors...
Module:DP,LS | 2017-02
Vector controls using a PWM (Pulse Width Modulation) control are commonly included in the drive circuits of high efficiency motors. A PWM control makes it possible to adjust the phase or amplitude of a current according to load and rotation speed, so they can achieve high efficiency in a wide operation range.
Module:DP, LS | 2015-12
An IPM motor's features are in its rotor geometry, where its magnets are embedded. When the stator's rotating magnetic field is applied in a direction that runs perpendicular to the rotor magnets (the q-axis) the motor operates like a normal SPM motor. When the current phase is displaced and...
Module:DP, LS | 2017-02
Interior permanent magnet (IPM) motors often use strong rare earth magnets. They have poor workability, however, because the magnets are inserted into the rotor's small gaps during the assembly process. After the magnets have been inserted the rotor generates a strong magnetic field, which means...
Module:DP, ST | 2013-10
Traditionally, the design of a motor's controls and the design of the motor itself were often performed independently because coordinated designs were difficult to carry out. Motor control designs have been getting more advanced, however, so there has been an increasing demand for simulations...
Module:DP,RT | 2015-04
Rotor eccentricity is one cause of vibration and noise in motors. It is well known that motor torque is produced by electromagnetic attraction and repulsion between the stator and rotor, but not much attention is paid to the fact that electromagnetic attraction acts in the radial direction between the rotor and stator.
Module:DP | 2015-12
More and more permanent magnet motors are starting to use rare earth magnets, which have a high energy product, in order to achieve higher output density. Neodymium rare earth magnets contain a great deal of iron so they have a high electric conductivity, but when a varying magnetic field is applied...
Module:TR | 2012-11
While motors have started being combined with motor drives and used in a wide range of velocities, further changes toward high output and high efficiency are being demanded of them. While higher speed revolution has been given as a means of attaining higher output, the centrifugal force becomes larger...
Module:DS | 2014-05
Exactly how to resolve the problem of rising temperatures is a critical issue when trying to achieve an improvement in a motor's efficiency and output. In order to solve this problem it is important to investigate a magnetic design that reduces the losses themselves because they are a source of heat,...
Module:HT, LS, TR | 2017-10
An IPM motor can use both magnet torque and reluctance torque, so by appropriately choosing the current phase it is possible to improve efficiency over a broad spectrum of drive range. It is a motor type that is often used in equipment with a wide operational range, from air compressors in air conditioners to motors that power vehicles.
Module:DP | 2017-08