Analysis and design of diverse electromagnet type actuators for moulded case circuit breaker

The SWASTIK type radial magnetic field (RMF) contact design is widely used in vacuum interrupters. The mutually perpendicular petal limbs are a unique feature of this contact design. The focus of this work is to relate the Lorentz force acting on the arc with petal dimensions through closed-form expressions. Considering the petal limbs as equivalent to finite current carrying conductors, analytical equations are derived to compute the magnetic flux density at any point in space. The results are verified by using finite-element method (FEM) simulations of rail electrodes. The expressions are then used to compute the Lorentz force on the arc in SWASTIK contacts. The analytical predictions are compared with three-dimensional FEM simulations of a CAD model of the contacts. Applicability of the analytical results is investigated in the context of parametric variation of the radius, length and position of the arc and temporal variation of the contact current. The present work can be used in the first iteration of contact petal design. It is also applicable for the design of rail gun geometries.

Section: Derivation Of Equationmentioning

confidence: 99%

“…Vacuum circuit breakers are finding increased usage in a wide spectrum of applications [1,2] besides the medium voltage range due to their robustness [3]. Radial magnetic field (RMF) contact design has been the workhorse of vacuum interrupters (VIs) since its inception.…”

Section: Introductionmentioning

confidence: 99%

Influence of petal parameters on the electromagnetic force driving the arc in RMF type vacuum interrupters

Bhat

Kulkarni

2018

“…Most of the designs are using radially magnetised PMs on the mover. There are several applications of LOA like circuit Breaker [22, 23], refrigeration [1, 4], automation, biomedical, manufacturing, automobile and aerospace industries [4].…”

Section: Introductionmentioning

confidence: 99%

Design of a high thrust density moving magnet linear actuator with magnetic flux bridge

Ahmad

Hassan

Khan

et al. 2020

This article presents a design of a high thrust density moving magnet linear actuator for linear refrigerator compressor. The shape of permanent magnet (PM) shows great effect on cost, fabrication and magnetic flux density generation in the actuator. Axially magnetised disk shaped PMs are low cost and convenient for fabrication. Moreover, axially magnetised PMs generate high flux density in a specific direction compared to radial magnets. This paper investigates the design of axially magnetised moving magnet linear oscillating actuator (LOA) which operates on single phase alternating supply. Additionally, an alternative path is proposed for the return of magnetic flux from mover to the stator. Using finite element method (FEM) tools, all the parameters of LOA are optimised. Moreover, with the help of a specially designed experimental setup, FEM simulation results are validated. This actuator demonstrates great advancement in thrust force density, motor constant and output power compared to the size of proposed LOA.

“…However, the holding force in the open stage is over the need of HVCB, which increases the wastage and closing time. Thus, the unsymmetrical structure bistable PMA (USBPMA) is proposed, which overcomes some of the disadvantages of the SSBPMA, such as the large retention in the opening state, and large closing current [22][23][24][25][26][27][28][29]. However, the USBPMA also has defects, such as a low initial speed.…”

Section: Introductionmentioning

confidence: 99%

“…The separated permanent magnetic cylindrical unsymmetrical bistable PMA is proposed in [23]. The evolutionary strategy algorithm, Kriging meta‐model, and multi‐step optimisation are used to optimise this separated permanent magnetic PMA in [24, 25]. The design method, with the Taguchi method and dynamic characteristic analysis, is presented for the unsymmetrical bistable PMA with magnetic barriers [26].…”

Section: Introductionmentioning

confidence: 99%

Unsymmetrical bistable multimagnetic circuit permanent magnet actuator for high‐voltage circuit breaker application: analysis, design, and dynamic simulation

Zeng

Yang

Yin

et al. 2020

In this study, an unsymmetrical bistable multi-magnetic circuit permanent magnetic actuator is proposed. The operating principle and mathematical model of the high-voltage circuit breaker with the proposed machine are analysed. Additionally, the static and dynamic characteristics of the high-voltage circuit breaker with the presented machine are investigated and evaluated using numerical finite element analysis methods. Furthermore, the influence of the length of the middle gap and the additional coil in the proposed machine are studied. The advantages of the presented machine, such as less magnet volume, low cost, high force density, and short starting time, are discussed. Finally, a prototype is created and tested, followed by the retrieval of the characteristic curves of the holding force to confirm the proposed design.