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Related Concept Videos

Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
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Force On A Current Loop In A Magnetic Field01:17

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Eddy Currents01:25

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Back EMF01:24

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Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
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Torque On A Current Loop In A Magnetic Field01:13

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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Motor Units00:46

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A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
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Updated: Nov 23, 2025

Ultrasound Velocity Measurement in a Liquid Metal Electrode
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Ultrasound Velocity Measurement in a Liquid Metal Electrode

Published on: August 5, 2015

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Liquid metal motor.

Erlong Wang1, Jian Shu1, Hu Jin1

  • 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230026, China.

Iscience
|January 1, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel liquid metal motor that operates without electromagnets, overcoming limitations of current soft machines. The new motor offers low friction and versatile functionality for soft robotics applications.

Keywords:
Electrical MaterialsMechanical DesignMetals

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Area of Science:

  • Materials Science
  • Robotics
  • Electrical Engineering

Background:

  • Liquid metal shows promise for soft functional devices.
  • Existing liquid metal machines require liquid environments, have weak forces, and poor maneuverability.

Purpose of the Study:

  • To develop a novel motor based on electrical actuation of liquid metal droplets.
  • To overcome the limitations of current liquid metal enabled machines.

Main Methods:

  • Encapsulation of electrolyte and liquid metal droplets in an enclosed system.
  • Development of a liquid metal electrical brush for low-friction operation.
  • Electrical actuation of liquid metal droplets without conventional electromagnets.

Main Results:

  • Stable and continuous torque generation outside of a liquid environment.
  • Motor operates with low friction, no sparking, and low noise.
  • The motor is constructed from soft materials.

Conclusions:

  • The developed liquid metal motor offers a versatile and efficient solution for soft robotics.
  • This innovation provides new opportunities for advancing soft functional devices and machines.