Calculation of the steady state performance for small commutator permanent magnet DC motors: classical and finite element approaches

Wing, M.; Gieras, Jacek F.

doi:10.1109/20.179401

Cited by 15 publications

(3 citation statements)

References 7 publications

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“…3, the back EMF at no load shows a periodical pulse every e =2p/N S , as a result of the coil shifting. Therefore, N S pulses per round are produced and an additional back EMF AC component is generated which features an angular frequency w p, which is equal to the rotor angular speed w r times the number of slots N S [19], [20].…”

Section: Sensorless Speed and Position Estimation In DC Machinesmentioning

confidence: 99%

Pulse Counting Sensorless Detection of the Shaft Speed and Position of DC Motor Based Electromechanical Actuators

Testa¹,

De²,

Scimone³

et al. 2014

Journal of Power Electronics

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Some of DC actuators used in home automation, office automation, medical equipment and automotive systems require a position sensor. In low power applications, the introduction of such a transducer remarkably increases the whole system cost, which justifies the development of sensorless position estimation techniques. The well-known AC motor drive sensorless techniques exploiting the fundamental component of the back electromotive force cannot be used on DC motor drives. In addition, the sophisticated approaches based on current or voltage signal injection cannot be used. Therefore, an effective and inexpensive sensorless position estimation technique suitable for DC motors is presented in this paper. This technique exploits the periodic pulses of the armature current caused by commutation. It is based on a simple pulse counting algorithm, suitable for coping with the rather large variability of the pulse frequency and it leads to the realization of a sensorless position control system for low cost, medium performance systems, like those in the field of automotive applications.

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Section: Sensorless Speed and Position Estimation In DC Machinesmentioning

confidence: 99%

Pulse Counting Sensorless Detection of the Shaft Speed and Position of DC Motor Based Electromechanical Actuators

Testa¹,

De²,

Scimone³

et al. 2014

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…We used the theoretical estimate for a 15 g NAV found in [21]. For an additional margin to account for various system losses, the value was increased by ∼15%, for instance, assuming an efficiency of the electric motor of 85% [22]. The required power was, therefore, increased from the reported 585 mW to 700 mW.…”

Section: Weight Budget and Power Budgetmentioning

confidence: 99%

Micro- and Nano-Air Vehicles: State of the Art

Petricca

Øhlckers

Grinde

2011

International Journal of Aerospace Engineering

121

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Micro- and nano air vehicles are defined as “extremely small and ultra-lightweight air vehicle systems” with a maximum wingspan length of 15 cm and a weight less than 20 grams. Here, we provide a review of the current state of the art and identify the challenges of design and fabrication. Different configurations are evaluated, such as fixed wings, rotary wings, and flapping wings. The main advantages and drawbacks for each typology are identified and discussed. Special attention is given to rotary-wing vehicles (helicopter concept); including a review of their main structures, such as the airframe, energy storage, controls, and communications systems. In addition, a review of relevant sensors is also included. Examples of existing and future systems are also included. Micro- and nano-vehicles with rotary wings and rechargeable batteries are dominating. The flight times of current systems are typically around 1 hour or less due to the limited energy storage capabilities of the used rechargeable batteries. Fuel cells and ultra capacitors are promising alternative energy supply technologies for the future. Technology improvements, mainly based on micro- and nanotechnologies, are expected to continue in an evolutionary way to improve the capabilities of future micro- and nano air vehicles, giving improved flight times and payload capabilities.

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“…However, these previous works concluded that all forces contributing to the motion of the rotor produced in the two flanks of the armature slot (this kind of force is called " armature torque" in the literature) and there is no tangential force on the teeth surface facing the field magnet. During the past two decades, with the advance of computer technologies coupled with the software package for numerical analysis, many researchers dealt with the torque computation of permanent magnet DC motors [5][6] [7], yet, they mainly focused on the total torque of a full rotor . To our knowledge, the literature accurately dealing with the electromagnetic force distribution in the teeth is rare.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Electromagnetic Force Distribution in the Armature Teeth of a Permanent Magnet DC Motor

Wang

Kano

1997

IEEJ Trans. FM

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The torque, to some extent, is an important performance index of electric motors. In many permanent magnet DC motors, the armature core is slotted with the winding embedded into the slots. What kind of force occurs on the armature teeth (or slot) and hence forms the torque is an interesting problem. In the past some relevant researches were reported, which concluded that all torque came from the force generated in the flanks of the armature teeth, and the force on the teeth surface facing the field magnet contributed nothing to the output torque. The objective of this paper is to investigate the overall electromagnetic force distribution in the armature teeth of a permanent magnet DC motor. An U-shaped core is employed as an analytical model which covers only one tooth pitch of the slotted armature, and the derivation of the force on the surfaces of the U-shaped core is obtained by means of the Maxwell stress method. Experimental results show that both tangential force on the teeth surface facing the field magnet and normal force in the flanks of the teeth contribute to the motion of a rotor. The analytical method and force expressions are verified by the experimental results.

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Calculation of the steady state performance for small commutator permanent magnet DC motors: classical and finite element approaches

Cited by 15 publications

References 7 publications

Pulse Counting Sensorless Detection of the Shaft Speed and Position of DC Motor Based Electromechanical Actuators

Pulse Counting Sensorless Detection of the Shaft Speed and Position of DC Motor Based Electromechanical Actuators

Micro- and Nano-Air Vehicles: State of the Art

Investigation on the Electromagnetic Force Distribution in the Armature Teeth of a Permanent Magnet DC Motor

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