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This paper presents a new algorithm for the practical implementation on embedded devices of the extended current Park's vector approach (EPVA), which substantially reduces the hardware and computational requirements needed for applying this technique. The EPVA is a proven technique for fault diagnosis of induction motors working in steady state regime. However, this approach has some practical limitations:...
This paper presents a rotor position estimated method of a five-phase IPM motor based on high-frequency sinusoidal voltage injection to improve the sensorless control system performance at low speed for electric vehicles. The high-frequency sinusoidal voltage is injected into the estimated rotor reference frame. The estimated rotor position and speed are obtained by detecting and processing high-frequency...
The thrust and levitation force of the long stator linear synchronous motor (LSLSM) are key points to evaluate the performance of the maglev train. However, it is not easy to be achieved due to the non-linear and dynamic coupling characteristics between thrust and levitation force. In this paper, the finite element analysis model of long stator linear synchronous motor is built for analyzing the thrust...
Taken permanent magnet synchronous motor with similar number of slots and poles as an object, in order to solve electromagnetic vibration problem, the restrain effect on electromagnetic vibration and its harmonies by auxiliary slot is researched in this paper. This paper analyzes the reasons of radial electromagnetic force wave by the analytical method. The influence of different numbers of auxiliary...
Based on the model of surface mounted permanent magnet synchronous motor, an improved algorithm for off-line parameter identification of motor is presented. In this paper, the single-phase sinusoidal AC signal is injected into the motor which can simulate the single-phase locked-rotor test and the DC signal is injected into the motor in order to simulate the DC test, then filtering the input signal...
This research analyzes two stator design features as structural solutions to reduce noise and vibration in permanent magnet synchronous machines (PMSM). The study was focused on a surface mounted PMSM with 12-stator slots and 10-rotor poles where vibration is a well-known issue. The structural-harmonic analysis was used to quantify the vibration by analyzing the radial deformation and acceleration...
This paper introduces a new topology of multi-stator hybrid excitation permanent magnet synchronous motor with flux weakening capacity. The presented machine features a hybrid magnetic circuit in which the flux generated by PMs are routed into two paths by employing an axial stator. The detailed structure of the presented machine is given in this paper together with the principle of flux weakening...
Permanent Magnet Synchronous Motor is characterized by high power density, high efficiency and high reliability, and it is superior in many applications. V/f control for PMSM is able to get rid of the expensive rotor position sensor, and it is of great research value. V/f control method for PMSM is investigated in this paper. Firstly, the reason for the instability of the traditional open-loop V/f...
Permanent Magnet Synchronous Motors (PMSMs) operating among wide speed range needs optimal flux-weakening method to reach to higher speed level. For motors whose critical point locates within the current limit circle, two different flux-weakening algorithms are discussed comparatively in this paper. One is the traditional feedback flux-weakening control strategy, the other is a revised feedback flux-weakening...
This paper provides a detailed investigation of the influence mechanism on vibration and noise of permanent magnet synchronous motors with skewed stators. Several skewed stator structures are researched to show the features of the flux and force. The finite element method is used to analyze the motor vibrations, displacements of deformation, and modals considering the mechanism of skewed stator. The...
Voltage and current sensors integrated in modern electrical equipment can enable extraction of advanced information on the network and the connected devices. While traditional methods for protection and network managements rely upon processing of these signals at low speed, high-frequency processing of the raw current and voltage signals can unveil information about the type of electrical load in...
This paper presents the ultrasonic frequency characteristic of electromagnetic vibration and noise for permanent magnet synchronous motor (PMSM). The analysis flowchart of the vibration noise was discussed, and the electromagnetic vibration is researched from the simulation results integrated theoretical analysis. This paper describe that the slots and pole combination has obvious influence on the...
This paper proposes a novel current sensorless drive system with only position sensor for permanent magnet synchronous motor drive in order to reduce costs and avoid problems caused by faults of the current sensor. Generally a pmsm drive controller needs at least two phase-current sensors, in this paper, the current sensors is omitted by replacing estimated stator current with extended kalman filter...
Coasting is a deceleration driving mode not recurring to an active braking while sustaining rolling as much as possible. In an electric vehicle (EV), coasting should be realized in theory by letting the $q$-axis current set to zero. However, unintentional braking takes place at high speeds when the gas pedal is tapped off. The reason is that negative torque is developed even when the $q$-axis current...
Backstepping control method can realize the decoupling of permanent magnet synchronous motor (PMSM), the design process is simple and easy to implement, so it has been widely used in the field of motor control. During the operation of the motor (PMSM), the change of parameters of the motor has bad effects on the perf o rma nce o f the control strategy based on backstepping approach. On the basis of...
The performance of high-speed motorized spindle will directly affect the overall performance of high-speed machine tools, such as machining precision, processing strength and efficiency, vibration and noise, lifetime and so on. As one of the key R&D items of the motorized spindle design, motor control system is a nonlinear and strong coupling system. Based on the analysis of the control system...
This paper presents sensorless control of Permanent Magnet Synchronous Motor (PMSM). In the sensorless control method, the stator current is measured to estimate the speed of the motor. When PMSM sensorless control is used in an electric vehicle, sometimes it causes another problem. When the motor is running in steady state and the motor is suddenly given a large load that has reverse torque direction,...
The development of electric vehicle is now growing rapidly. Demands to deliver a reliable and easy to drive in motor control causes Brushless Direct Current (BLDC) motor becomes a potential candidate. A BLDC motor drive is a potential option for an electric vehicle since it has a high reliability, simple design, and ability to work at high rotation per minute (RPM). This paper discussed the Permanent...
This paper discusses the problem of a sensorless control method for permanent magnet synchronous machines named Direct Flux Control (DFC). Direct Flux Control provides its users with the angle of the total flux in the machine at all working points, including standstill. The Direct Flux Control signals are a mirror for the current inductivity and flux distribution in a permanent magnet synchronous...
This paper presents a sensorless starting procedure for a soft starter driven IE4 direct on line permanent magnet motor (PMSM). After determining the initial position of the motor using a pulsating current space vector, the motor is started from standstill by the soft starter from a known position. The following firing angles can be calculated based on the measured back-emf voltage of the motor. The...
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