scholarly journals Modified PWM Direct Instantaneous Torque Control System for SRM

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yong Cheng
Keyword(s):  
Control System ◽  
Traditional Method ◽  
Buffer Zone ◽  
Torque Ripple ◽  
Torque Control ◽  
Experimental Results ◽  
Output Torque ◽  
Sharing Function ◽  
Equivalent Method ◽  
Modified Algorithm

Torque ripple is a defect of switched reluctant motors. DITC (direct instantaneous torque control) is harnessed to solve the problem as a traditional method, which is superior to TSF (torque sharing function). In this paper, a new controller is proposed with modified hysteresis and PWM in DITC. With the modified algorithm, the torque error will be reduced with PWM in DITC. The proposed algorithm is effective to improve sample and 0 status in a period. The modified algorithm is based on application of zero in the asymmetric half bridge, which is implemented as the buffer zone. In case of big torque error, hysteresis will mitigate error under the characteristic of fast responding. In case of small errors, the modified PWM will solve torque error in the equivalent strategy, which has adopted the essence of the impulse equivalent method. The modified controller is designed to reduce responding time and minimize the torque ripple under the proposed algorithm, which has been designed to harness different functions in different torque errors. Based on final simulation and experimental results, responding speed and reduction of output torque ripple are enhanced effectively.

Study on speed sensorless system of permanent magnet synchronous motor based on improved direct torque control

2021 ◽  
pp. 014233122110629
Author(s):  
Xiaoxin Hou ◽  
Mingqian Wang ◽  
Guodong You ◽  
Jinming Pan ◽  
Xiating Xu ◽  
...  
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Synchronous Motor ◽  
Torque Control ◽  
Switching Frequency ◽  
Speed Sensorless ◽  
Stator Resistance

The traditional direct torque control system of permanent magnet synchronous motor has many problems, such as large torque ripple and variable switching frequency. In order to improve the dynamic and static performance of the control system, a new torque control idea and speed sensorless control scheme are proposed in this paper. First, by deriving the equation of torque change rate, an improved torque controller is designed to replace the torque hysteresis controller of the traditional direct torque control. The improved direct torque control strategy can significantly reduce the torque ripple and keep the switching frequency constant. Then, based on the improved direct torque control and considering the sensitivity of the stator resistance to temperature change, a speed estimator based on the model reference adaptive method is designed. This method realizes the stator resistance on-line identification and further improves the control precision of the system. The performance of the traditional direct torque control and the improved direct torque control are compared by simulation and experiment under different operating conditions. The simulation and experimental results are presented to support the validity and effectiveness of the proposed method.

Analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in HEV applications

2019 ◽  
Vol 38 (6) ◽  
pp. 1725-1737
Author(s):  
Xiaodong Sun ◽  
Jiangling Wu ◽  
Shaohua Wang ◽  
Kaikai Diao ◽  
Zebin Yang
Keyword(s):  
Fault Tolerant ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Experimental Results ◽  
Element Analysis ◽  
Content Type ◽  
Switched Reluctance ◽  
Output Torque ◽  
Reluctance Motor ◽  
Lower Torque

Purpose The torque ripple and fault-tolerant capability are the two main problems for the switched reluctance motors (SRMs) in applications. The purpose of this paper, therefore, is to propose a novel 16/10 segmented SRM (SSRM) to reduce the torque ripple and improve the fault-tolerant capability in this work. Design/methodology/approach The stator of the proposed SSRM is composed of exciting and auxiliary stator poles, while the rotor consists of a series of discrete segments. The fault-tolerant and torque ripple characteristics of the proposed SSRM are studied by the finite element analysis (FEA) method. Meanwhile, the characteristics of the SSRM are compared with those of a conventional SRM with 8/6 stator/rotor poles. Finally, FEA and experimental results are provided to validate the static and dynamic characteristics of the proposed SSRM. Findings It is found that the proposed novel 16/10 SSRM for the application in the belt-driven starter generator (BSG) possesses these functions: less mutual inductance and high fault-tolerant capability. It is also found that the proposed SSRM provides lower torque ripple and higher output torque. Finally, the experimental results validate that the proposed SSRM runs with lower torque ripple, better output torque and fault-tolerant characteristics, making it an ideal candidate for the BSG and similar systems. Originality/value This paper presents the analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in hybrid electric vehicles. Using FEA simulation and building a test bench to verify the proposed SSRM’s superiority in both torque ripple and fault-tolerant capability.

Research on Constant Torque Control System Design for Hydraulic Retarder of Heavy Vehicle

2012 ◽  
Vol 538-541 ◽  
pp. 2493-2499 ◽  
Author(s):  
Ming Xu ◽  
Hui Yuan Li
Keyword(s):  
Control System ◽  
Control Parameter ◽  
Flow Characteristic ◽  
Torque Control ◽  
Control System Design ◽  
Heavy Vehicle ◽  
Test Bed ◽  
Constant Torque ◽  
Output Torque ◽  
Hydraulic Retarder

The analysis of inner circulation circle flow characteristic of the partly filled hydraulic retarder during its braking course is carried out. a relation between the liquid filled ratio of the circulation circle in hydraulic retarder， the inner flow field pressure characteristic and the output torque characteristic of it is established, The control parameter token for the hydraulic retarder torque characteristic is acquired, then the Constant Torque Control System for Heavy Vehicle Hydraulic Retarder is formed. Through a test bed experiment of Constant Torque Control System for Heavy Vehicle Hydraulic Retarder, the validation of the Constant Torque Control System for Heavy Vehicle Hydraulic Retarder is verified，the whole system perfectly meet the design request.

Study of Direct Torque Control System of Matrix Converter Multiple Voltage Vectors

2012 ◽  
Vol 588-589 ◽  
pp. 1615-1618
Author(s):  
Zhou Yue
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Direct Torque Control ◽  
Input Voltage ◽  
Torque Ripple ◽  
Matrix Converter ◽  
Torque Control ◽  
Voltage Vector ◽  
Simulation Results ◽  
Zero Voltage

In order to reduce torque ripple. Studied direct torque control of motor that fed by matrix converter. Illustrated control strategy the multiple voltage vector of matrix converter. Full utilize big and small input voltage of matrix converter synthesis long, short and zero voltage vector based on direct torque control of motor that fed by matrix converter, through the rational use of long, short and zero voltage vector to reduce torque ripple. The simulation results demonstrated that the validity of theoretical analysis and modulation strategy presented.

scholarly journals PWM Switching Strategy for Torque Ripple Minimization in BLDC Motor

2011 ◽  
Vol 62 (3) ◽  
pp. 141-146 ◽  
Author(s):  
Wael Salah ◽  
Dahaman Ishak ◽  
Khaleel Hammadi
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Position Control ◽  
Torque Ripple ◽  
Experimental Results ◽  
Bldc Motor ◽  
Switching Strategy ◽  
Rotor Position ◽  
Output Torque ◽  
Torque Ripples

PWM Switching Strategy for Torque Ripple Minimization in BLDC Motor This paper describes a new PWM switching strategy to minimize the torque ripples in BLDC motor which is based on sensored rotor position control. The scheme has been implemented using a PIC microcontroller to generate a modified Pulse Width Modulation (PWM) signals for driving power inverter bridge. The modified PWM signals are successfully applied to the next up-coming phase current such that its current rise is slightly delayed during the commutation instant. Experimental results show that the current waveforms of the modified PWM are smoother than that in conventional PWM technique. Hence, the output torque exhibits lower ripple contents.

scholarly journals Control System Design for 16/6/8 Double-Stator Bearingless Switched Reluctance Motor

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Chuanyu Sun ◽  
Hang Yang ◽  
Shangke Han ◽  
Hongchang Ding ◽  
Jiaqing Li ◽  
...  
Keyword(s):  
Control System ◽  
Levitation Force ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Torque Control ◽  
Strong Nonlinearity ◽  
Loop Control ◽  
Switched Reluctance ◽  
State Process ◽  
Reluctance Motor

The 16/6/8 double-stator bearingless switched reluctance motor (DSBSRM) is used as the object of study in this paper. To solve the problem of torque and levitation force ripples in this motor, a control system direct force control (DFC) and direct instantaneous torque control (DITC) based on the torque sharing function (TSF) are proposed. With the strong nonlinearity and approximation capability of radial basis function neural networks, the torque and levitation force observer are designed. The observed torque and levitation forces are used as feedback for the internal loop control, which is combined with the external loop control to make a double closed-loop control. In order to further improve the output torque and system robustness and suppress the torque ripple in steady-state process, the motor winding method is optimized and a set of switching angles is added on the basis of TSF. The simulation results verify the effectiveness and superiority of the proposed control method. It effectively suppresses speed ripple and reduces torque and levitation force fluctuations and rotor radial displacement jitter.

A Novel Optimal PI Parameter Tuning Strategy to Improve Constant Switching Performance of Direct Torque Control

2016 ◽  
Vol 7 (2) ◽  
pp. 422
Author(s):  
Sundram Ramahlingam ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Control Structure ◽  
Direct Torque Control ◽  
Parameter Tuning ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
Switching Performance ◽  
Output Torque ◽  
Stator Flux ◽  
Tuning Strategy

<p>This paper presents a novel method of optimal Propotional-Intergral (PI) controller’s parameter tuning strategy in-order to improve the Constant Switching Performance of 3-phase DTC shceme. The Direct Torque Control (DTC) sheme is acknowledged to provide fast decoupled control over the torque output and stator flux via a simple control structure. However, DTC sheme has two major downsides, which are the inconsistent inverter switching frequency and high torque output ripple. The main reason that contributes to these tribulations is the usage of hysteresis comparators in order to control the output torque. The realization of PI based controller method as replacement of hyterisis controller in DTC system able to provide significant solutions to over come the fall back while retaining the simple control structure of conventional DTC. The combination usage of higher sampling controller DS1004 and also 3-level CHMI in this system can further minimize the output torque ripple by providing higher resolution with lower digital error and greater number of vectors. This paper presents detail explanation and calculation of optimal PI parameter tuning strategy consecutively to enhance the performance of 3-level DTC system. In order to verify the feasibility of the proposed method experimentation, the proposed method is compared with convention DTC system via simulation and experiment results.</p>

scholarly journals Reduction of torque ripple in DTC induction motor drive with discrete voltage vectors

2014 ◽  
Vol 11 (1) ◽  
pp. 159-173 ◽  
Author(s):  
Marko Rosic ◽  
Borislav Jeftenic ◽  
Milan Bebic
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Ripple ◽  
Theoretical Background ◽  
Torque Control ◽  
Experimental Results ◽  
Motor Drive ◽  
Practical Implementation ◽  
Induction Motor Drive

This paper presents ? practical implementation of direct torque control (DTC) of an induction machine on MSK2812 DSP platform, and the analysis of possibilities for reduction of torque ripple. Basic theoretical background relating the DTC was primarily set and the obtained experimental results have been given. It is shown that the torque ripple can be reduced by adjusting the intensity of voltage vectors and by modification of hysteresis comparator, while the simplicity of the basic DTC algorithm has been maintained.

Improvise 3-Level DTC of Induction Machine using Constant Switching Frequency Method by Utilizing Multiband Carrier

2016 ◽  
Vol 7 (3) ◽  
pp. 638
Author(s):  
Sundram A/l Ramahlingam ◽  
Auzani Bin Jidin ◽  
Tole Sutikno ◽  
L. Logan Raj
Keyword(s):  
Control Structure ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Parameter Tuning ◽  
Torque Ripple ◽  
Torque Control ◽  
Switching Frequency ◽  
Frequency Method ◽  
Output Torque ◽  
Switching Method

This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple. The major factorthat contributes to these problems the usage of hysteresis based comparators to control the output torque. The implementation of PI based constant switching method in DTC able to solve these problems while retaining the simple control structure of conventional DTC. The combination usage of 3-level CHMI in this system can further minimize the output torque ripple by providing greater number of vectors. This paper presents detail explanation and calculationof optimal PI parameter tuning strategyconsecutively to enhance the performance of 3-level DTC system. In order to validate the feasibility, the proposed method compared with convention DTC system via simulation and experiment results.

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