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In order to evaluate the energy efficiency of electrical drive systems for automation, simulations are made. For this purpose energy-accurate models are needed, which include all significant losses. The development and verification of an optimized simulation model for a permanent magnet synchronous motor with a nominal power of 1 kW is presented in this paper, using measurements in different operating...
This paper proposes maximum torque per ampere (MTPA) control and the active damping control of mono inverter dual parallel (MIDP) permanent magnet synchronous motor (PMSM) drive system. MIDP motor drive system is one of the configurations for reducing the cost of the power conversion circuits. However, it is hard to apply the MIDP motor drive system to PMSMs due to the instability unlike the induction...
This paper investigates the effect of demagnetization of the permanent magnets (PM) on the performance of interior permanent magnet motors. In order to remove the individual difference of the motors, several shapes of PMs are prepared, and the experiments are carried out with the same stator. This paper takes into account two types control strategy, V/f constant control and vector control. It is clarified...
Permanent magnet synchronous motors have been widely used due to their high performance and high efficiency. In this paper, we talk about the control of a 750kW permanent magnet synchronous generator which is used for a hybrid turbocharger for a marine application. The controller outputs regulated 700V dc bus voltage with a voltage variation of less than 5% under 100% load transient condition to ensure...
This paper presents a novel control strategy to stably support the rotor shaft when a bearingless motor (BELM) based on d-q axis current control is driven under loaded condition. In this type BELM, the magnitude and direction of the suspension force are unfortunately varied depending on the rotor rotation, which causes the unstable rotor levitation during the motor operation. Thus, the compensation...
This paper proposes a control method of permanent-magnet synchronous motor (PMSM) drive system based on direct torque control (DTC) in high speed region. In high speed region, when the magnet flux of the PMSM is relatively weak, maximum torque per flux (MTPF) control is used for wide-speed-range operation. In the DTC-based motor drive system, the reference torque and the reference flux are required...
Monitoring critical temperatures in electric motors is crucial for preventing shortened motor life spans due to excessive thermal stress. With regard to interior permanent magnet synchronous motors (IPMSM), critical temperatures typically occur in the magnets and in the stator end winding. As directly measuring temperatures, especially on the rotating part, is costly, sensitive and thus not applicable...
This paper presents a novel auto-tuning method of inductances for permanent magnet synchronous motor (PMSM). In the proposed method, inductances are measured injecting high frequency current and voltage to the motor at standstill. On the basis of adaptive control, the current control executing inductance tuning is stable and highly accurate up to the high frequency area, though motor parameters are...
This paper proposes a simple magnetic equivalent circuit using permeance method in order to design rough configurations of the lowest loss motor. First, the iron loss is calculated by the proposed method and compared with the analysis result by finite element method (FEM). As a result, the error of the calculation results between the proposed method and the FEM is 2.9%. Next, the motor losses are...
This paper proposes a novel noise reduction method by injected frequency control for position sensorless control of permanent magnet synchronous motor (PMSM). The proposed method reduces acoustic noise caused by injected high-frequency voltage without reducing the accuracy of rotor position estimation. The proposed method is verified by numerical simulations and experiments using a 0.8kW-PMSM.
This paper discusses a multi-parallel drive system for permanent magnet synchronous motors (PMSMs). This system proposes to use two different functions of inverter, a main inverter to drive parallel connected PMSMs and an auxiliary inverter to suppress the vibration of the motor speed. However, the power capacity of the auxiliary inverter depends on the speed response. In this paper, the performance...
In this paper, a novel online particle swarm optimization method is proposed to design speed and current controllers of sensorless vector controlled interior permanent magnet synchronous motor drives. The sliding mode observer is used for joint stator flux and rotor speed estimation. The stator resistance variation is compensated with a speed correction term which is derived from the estimation error...
We have developed a mathematical model for permanent magnet synchronous motors (PMSMs). The nonlinear characteristics of this model are expressed using a total of eight constants. The magnet flux characteristics of PMSMs can be obtained by using this simplified model. This model can also be transformed into a reverse function, and motor drive simulation including nonlinear characteristics can easily...
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