Simple Classroom Demonstration of Lenz's Law and the ac Induction Motor

Matthews, P. W.

doi:10.1119/1.1971162

Cited by 2 publications

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“…There are several articles describing and investigating the use of the electric motor as a teaching resource in the classroom, but from an experimental perspective [5][6][7]. On the other hand there is a lot of literature about more conceptually complicated motors and dynamos, like Ampere's homopolar motor [8,9], Faraday's dynamo [10], induction motor [11][12][13], etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the DC electric motor

Moreno¹

2018

Eur. J. Phys.

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We analyze the motion of a simple DC brushed electric motor: a rotating loop of current (rotor) with a commutator in the presence of a constant uniform magnetic field (stator). We solve numerically the equations of motion and investigate the different characteristics of the solution space. For some values of the parameters, simple asymptotic steady-state solutions can be found. In particular we obtain expressions for the terminal angular speed, relaxation time, average power, and efficiency in the steady-state.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of the DC electric motor

Moreno¹

2018

Eur. J. Phys.

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Mechanism of angular momentum transfer from microwaves to a copper ring

et al. 2016

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In the exchange of orbital angular momentum between an electromagnetic wave and a copper ring we examine the origin of the Angular Momentum. We then investigate the transfer mechanism between the microwave and the object, and compare it with other mechanisms. We evidence a transfer mechanism based on the reflection of the electromagnetic field on the copper ring. In particular, at a microscopic scale, we show that the electromagnetic field induces alternative electric currents in the ring, with a small drift. Although little, the resistivity of copper leads to a force that rotates the ring. The estimation of the torque, which is of the order of 10 −8 Nm, is in good agreement with the experimental measurements. We also show that the transfer of electromagnetic orbital angular momentum to objects could be a way to measure the orbital angular momentum carried by electromagnetic fields, and we discuss possible applications.PACS. 41.20.Jb Electromagnetic wave propagation; radiowave propagation -45.20.da Forces and torques -84.40.Ba Antennas: theory, components and accessories -42.50.Tx Optical angular momentum and its quantum aspects

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Simple Classroom Demonstration of Lenz's Law and the ac Induction Motor

Cited by 2 publications

References 0 publications

Numerical investigation of the DC electric motor

Numerical investigation of the DC electric motor

Mechanism of angular momentum transfer from microwaves to a copper ring

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