Critical evaluation of cogging torque in BLDC motor with various techniques

Doss, M. Arun Noyal; Jeevananthan, S.; Dash, Subhransu Sekhar; Hussain, Muhammad

doi:10.1504/ijaac.2013.057042

Cited by 7 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Torque ripples in motors are also mitigated properly by designing the structural symmetry and aligning stator poles in an optimized manner. This results in the reduction of the cogging torque which is one of the main reasons for ripple generation which affects high acoustic noise and EMI interference in the machine itself [20]. The main reason behind the cogging torque generation is the communication between the permanent magnet and stator silicon core [21][22].…”

Section: B Literature Survey and Backgroundmentioning

confidence: 99%

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

et al. 2022

View full text Add to dashboard Cite

Brushless direct current (BLDC) motors are mostly preferred for dynamic applications such as automotive industries, pumping industries, and rolling industries. It is predicted that by 2030, BLDC motors will become mainstream of power transmission in industries replacing traditional induction motors. Though the BLDC motors are gaining interest in industrial and commercial applications, the future of BLDC motors faces indispensable concerns and open research challenges. Considering the case of reliability and durability, the BLDC motor fails to yield improved fault tolerance capability, reduced electromagnetic interference, reduced acoustic noise, reduced flux ripple, and reduced torque ripple. To address these issues, closed-loop vector control is a promising methodology for BLDC motors. In the literature survey of the past five years, limited surveys were conducted on BLDC motor controllers and designing. Moreover, vital problems such as comparison between existing vector control schemes, fault tolerance control improvement, reduction in electromagnetic interference in BLDC motor controller, and other issues are not addressed. This encourages the author in conducting this survey of addressing the critical challenges of BLDC motors. Furthermore, comprehensive study on various advanced controls of BLDC motors such as fault tolerance control, Electromagnetic interference reduction, field orientation control (FOC), direct torque control (DTC), current shaping, input voltage control, intelligent control, drive-inverter topology, and its principle of operation in reducing torque ripples are discussed in detail. This paper also discusses BLDC motor history, types of BLDC motor, BLDC motor structure, Mathematical modeling of BLDC and BLDC motor standards for various applications.INDEX TERMS BLDC motor, torque ripple, current shaping techniques, controlling input voltage, direct torque control, drive-inverter topology, field orientation control, motor design, fault tolerance control and electromagnetic interference reduction.

show abstract

Section: B Literature Survey and Backgroundmentioning

confidence: 99%

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The most widely used method for calculating cogging torque is the virtual work method (VWM). The virtual work method is also called the co-energy method [24]. The basic principle is that neglecting the variation in magnets and iron of PMBLDC motor, the cogging torque of an ideal lossless PMBLDC motor can be expressed as the derivative of co-energy in the air gap [25].…”

Section: Analytical Expression Of Cogging Torque By Vwmmentioning

confidence: 99%

Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement

Anuja

Doss

2021

Energies

Self Cite

View full text Add to dashboard Cite

Cogging torque is a critical dilemma in Permanent Magnet Brushless DC (PMBLDC) motors. In medium-low power PMBLDC motors, redundant vibrations and forbidding noises arise as a result of the harmonic magnetic forces created by cogging torque. This paper introduces a simple approach for minimizing cogging torque in PMBLDC motors by applying placement irregularities in rotor magnets. An angle shift in the rotor magnets in surface-mounted PMBLDC motors helps to attain magnet displacement. This displacement imparts an asymmetrical magnet structure to the rotor. Maintaining pole arc to pole pitch ratio (L/τ) of between 0.6 and 0.8, shifting angles from 1° to 8° were considered in order to analyze the effect of the angle shift on the rotor magnets. An analytical expression was also derived for finding the shifting angle with the minimum cogging torque in the PMBLDC motor by using the Virtual Work Method (VWM). The optimization of the shifting angle with minimum cogging torque was investigated using 3D Finite Element Analysis (FEA). A comparison of the simulation and analytical results of cogging torque was carried out. It was determined that the reduction of cogging torque in the analytical results showed good agreement with the FEA analysis.

show abstract

“…From Eq. 5, B(θ, α) 2 and G(θ) 2 can be calculated through Fourier series expansions and are given below.…”

Section: Analysis Of Cogging Torquementioning

confidence: 99%

“…Cogging torque minimization has become an important issue since the motor has to improve its performance for torque ripple sensitive applications such as electric power steering and robotics. Several experimental researches have been carried out in cogging torque minimization [1][2][3][4][5][6][7][8][9][10][11][12]. The T-shape bifurcation shows good impact on reducing cogging torque compared with reduced stator tooth techniques, which was an effective technique in stator slot modification technique.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Cogging Torque Reduction in Permanent Magnet Brushless Dc Motor Using T-Shaped Bifurcation in Stator Teeth

Doss¹,

Brindha²,

Mohanraj³

et al. 2018

PIER M

Self Cite

View full text Add to dashboard Cite

A variety of techniques are available to reduce cogging torque in Permanent Magnet Brushless DC (PMBLDC) motors. In general, all the techniques are meant for effectively reducing the cogging torque. This paper presents a new technique for cogging torque reduction in a radial flux surface mounted PMBLDC motor by applying the proposed T-shaped bifurcation method in the stator teeth of a PMBLDC motor. The Finite Element Analysis (FEA) is carried out for the Tshaped bifurcation method applied to a PMBLDC motor, and analysis is done using Virtual Work (VW) method. The CAD software package MagNet has been used to completely analyze the T-shaped bifurcation based PMBLDC motor. FEA and CAD simulated results are compared for the reduction of cogging torque values. It is found that the cogging torque reductions in the two methods are nearly the same. The cogging torque and the flux density values of the motor calculated using the proposed T-shaped bifurcation method are compared with the corresponding values of the recently introduced Reduced Stator Slot Width method. The proposed T-shaped bifurcation is very effective compared to the existing techniques in reducing the cogging torque.

show abstract

Critical evaluation of cogging torque in BLDC motor with various techniques

Cited by 7 publications

References 0 publications

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

Reduction of Cogging Torque in Surface Mounted Permanent Magnet Brushless DC Motor by Adapting Rotor Magnetic Displacement

A Novel Method for Cogging Torque Reduction in Permanent Magnet Brushless Dc Motor Using T-Shaped Bifurcation in Stator Teeth

Contact Info

Product

Resources

About