What is a voice coil actuator?
A voice-coil actuator, also known as a noncommutated DC linear actuator, is a type of direct-drive linear motor. The current flowing through the coil assembly interacts with the permanent magnetic field and generates a force vector perpendicular to the direction of the current.
What is the working principle of voice coil?
Voice coils are based on a copper coil energized by an electric current and placed inside a magnetic field usually provided by permanent magnets. The force generated by the coil is proportional to the magnetic field and the direction and magnitude of the electric current.
What is the actuator in a vocal system?
A voice coil actuator, also known as a non-commutated DC linear actuator, is a type of direct drive linear motor. Voice coils come in a range of sizes, from devices that generate a few ounces of force, to others that generate several hundred pounds of force.
What is a voice coil motor?
Voice Coil Motors are highly controllable electrical actuators suitable for applications needing only limited displacement. They offer the following features: • Fast operation – Low electrical inductance, and low moving mass enable fast inflow of current and high acceleration.
How does a magnetic actuator work?
Magnetic Actuators use magnetic effects to generate forces which impact on the motion of a part in the actuator. The first large family of magnetic actuators is based on the magnetic forces acting at distance, the Laplace-Lorentz forces and the reluctance forces.
Is voice coil an electromagnet?
The voice coil component of a speaker is actually just an electromagnet. Electromagnets are coils of wire, and they’re normally wrapped around some kind of magnetic metal, like iron.
Is a voice coil a solenoid?
A voice coil generates a force based on an interaction of a current carrying conductor in a permanent magnetic field. A solenoid generates force based on an electromagnetic field that is created by a current carrying conductor.
What’s the purpose of dual voice coils?
A dual voice coil speaker has two voice coils that allow a single speaker to output both stereo channels through one speaker, creating a stereo sound from a single speaker location. Many classic cars came with only one speaker installed in the dashboard.
Is single or dual voice coil better?
Car subwoofers are manufactured with either a single voice coil (SVC) or dual voice coil (DVC). The difference is the DVC sub offers more wiring options to better match and take advantage of the amplifier. A dual voice coil sub does not directly perform better than the same sub with a single voice coil.
Does size of voice coil matter?
Coil Size Matters A smaller speaker like a 6″ speaker, often has a smaller voice coil than a larger speaker like the 8” version of the same speaker. Why does that matter? Well, the larger you make the voice coil, the more power it can handle—but at the same time, it also generates more heat.
How does a voice coil actuator work?
Voice coil actuators are a type of direct drive mechanism that provides extremely precise positioning over small displacements. Like linear motors, they work on the principle of a permanent magnet field and a coil winding.
What kind of motor is a voice coil?
A voice coil actuator, also known as a non-commutated DC linear actuator, is a type of direct drive linear motor. The name “voice coil” comes from one of its historically first applications: vibrating the paper cone of a loudspeaker.
How does a voice coil move a mass?
•A voice coil is a linear actuator, that moves a mass along a line. •To be precise, it pushes and pulls a mass wherever it is along a line. •But a voice coil doesn’t primarily move things, it is a consequence of the force it applies.
Why do voice coils have good force control?
Even without a feedback device, a voice coil actuator has good force control due to the fact that the force generated is directly proportional to the applied current. Voice coils draw current when holding a load in a fixed position, or in vertical applications when counteracting the weight of the load.
