High-speed Synchronous Motor Research Articles

Research on high-speed synchronous motor direct torque control

High-speed motor is increasingly used in ultra-high precision machining and high-performance machinery. It is necessary to achieve closed-loop control of high-speed motor in order to realize high-performance motor control. The high-frequency and high-speed characteristics of high-speed motor have brought great difficulties for its realization of closed-loop control. The performance of the hexagonal flux direct torque control (DTC) method that can reduce the switching frequency of power devices is researched for high-speed synchronous motor in this paper. After adopting this control method, the harmonics in the motor current and torque can be suppressed by adopting an appropriate filtering method. The same effect as the conventional DTC can still be achieved. It provides a basis for the application realization of the high-speed synchronous motor control system.

Efisiensi Motor Sinkron Linier dengan Magnet Permanen Sebagai Penggerak KRL Terbaru

The latest electric train at this time has begun to be widely used linear synchronous motors with permanent magnets as driving locomotives. This permanent magnet has the same function as a conventional synchronous motor which is to produce a magnetic field so that the motor can move linearly. This linear synchronous motor does not have a gear (gear) and axis, but the mechanical motion of this linear motor is synchronous with the magnetic field running. This running magnetic field is produced by the entanglement of the three phases and the arrangement of magnetic poles U, S, U, S. Because the motor is linear synchronous is a high-speed motor, the mechanical speed is the same as the speed of the magnetic field running. So that this motor is capable of producing large thrust compared to the use of conventional motors (DC motors and induction motors) to drive electric rail trains. If the conventional synchronous motor uses a frequency of 50 Hz, then the linear high-speed synchronous motor uses a frequency of 5-50 Hz in changing its speed and this research the efficiency, electromagnetic power (thrust) and thrust force of a synchronous motor will be analyzed. linear according to the frequency selection from 5-50 Hz, to drive the electric train locomotive.

A Power Hardware-in-the-Loop (P-HIL) Test Bench Using Two Modular Multilevel DSCC Converters for a Synchronous Motor Drive

This paper provides an analytical and experimental discussion on a power hardware-in-the-loop (P-HIL) test bench for a medium-voltage high-power high-speed synchronous motor drive. This test bench consists of two modular multilevel double-star chopper-cell (DSCC) converters connected front-to-front without a transformer. An experimental downscaled P-HIL test bench is designed, constructed, and tested to confirm its operating performance. The three-phase 400-Vdc 10-kW DSCC inverter with eight chopper cells per arm is used as a “real” inverter under test. The other DSCC rectifier is used as a set of a “virtual” three-phase 200-V 10-kW 300-Hz four-pole 9000-r/min synchronous motor and a “virtual” high-speed centrifugal compressor with a quadratic torque-to-speed load characteristic.

2台のモジュラー・マルチレベルDSCC変換器を用いた仮想高圧・高速同期電動機の駆動試験システム

This paper discusses the experimental verification of a virtual synchronous-motor drive test system. This test system consists of two identical modular multilevel double-star chopper-cell (DSCC) converters characterized by a front-to-front (FTF) connection. One converter acts as an inverter under test, while the other acts as a part of the virtual motor and load. The experimental waveforms obtained from the test system designed and constructed in this paper confirm satisfactory electrical and mechanical dynamics of the virtual three-phase 200-V, 10-kW, two-pole, 18,000-r/min synchronous motor with a virtual quadratic-torque-to-speed load an as a high-speed compressor. The driving performance of the test system shows that the DSCC inverter under test is applicable to high-speed synchronous motor drives.

Investigation Into the High-Frequency Limits and Performance of Load Commutated Inverters for High-Speed Synchronous Motor Drives

Load commutated inverters (LCIs) are still widely used for their robustness and reliability in high-power synchronous motor drives, in either single or multiple three-phase configurations. A restriction to their use in high-speed applications is due to the criticalities of thyristor operation at high switching frequencies. The upper frequency limits of LCIs are usually addressed in the existing literature as something independent of the drive architecture. On the contrary, this paper highlights how the maximum frequency that can be safely attained closely relates to the number of LCIs that are used to supply the synchronous motor. In fact, moving from a single to multiple three-phase arrangements is proved to introduce more stringent frequency constraints due to the mutual interaction between stator windings during commutations. Frequency limits for safe operation of single- and multiple-LCI drives are derived in quantitative terms and experimentally assessed on a 2-MW synchronous motor fed by a couple of LCIs. Practical implications of such limits in the design of high-power high-speed drives are finally discussed.

A static frequency converter in composition of high-speed rectifier drive

The algorithm and structure of a converter for the sensor-free control of a high-speed synchronous motor with constant magnets is considered.

Characteristics of brushless salient pole self‐excited high speed synchronous motor

Characteristics of brushless salient pole self‐excited high speed synchronous motor

Application of Large High-Speed Synchronous Motors

The use of larger high-speed synchronous motors is increasing in the process industry. For these applications there are two basic types of machines, i.e., laminated pole and solid pole. Motors of these designs are available for across the line starting in sizes to 50 000 hp at 1800 r/min. Even larger machines can be expected for future applications. While the theory behind the design and use of these machines is not new, problems are highlighted in the areas of motor starting and/or acceleration, torsional vibration, lateral vibration, couplings, excitation controls, and surge protection.

Design and Application of Two-Pole Synchronous Motors

The paper presents a brief resume of the problems encountered in the design of two-pole high-speed synchronous motors together with a description of how they are met. A satisfactory design is worked out. The theory of the starting winding is given briefly in non-mathematical language, and curves are presented showing the results obtained in so far as current and torque are concerned. It also outlines the applications in which these motors have been used, pointing out both the advantages and the limitations of synchronous motors. This is followed by a description of the operating characteristics and of the method of controlling the motors.