Glossary

♦A

AC	Abbreviation for alternating current.

♦B

Brush

An electric conductor that slides across the commutator to make an electrical contact.

♦C

Casting mold	The shaped mold used to produce a casting from molten metal
Cladding	The result of joining two sheets of different metal materials to a base sheet via a metallurgical process; such as rolling to produce a composite that exhibits the characteristics of both metals.
Clearance	The space required around the vibration motor to enable it to function as intended.
Commutator	Used to reverse the current flow to the coil, the commutator is connected electrically to the rotating coil and power supply, along with the brushes.
Contact voltage drop	The drop in voltage when contact is made between the brush as the commentator, relative to the voltage prior to contact. The drop in voltage is caused by electrical resistance.
Constant revolution speed	The rated speed when the motor is operating normally.

♦D

DC	Abbreviation for direct current.

♦F

Forging

High-temperature process involving the use of forging tools and press forging machines to shape metal.

♦H

Housing	Metal case designed to protect the motor and prevent magnetic leakage.
Lowest resonance frequency	The lowest frequency at which the maximum absolute electric resistance of the coil is attained.

♦M

Maximum input	The maximum signal input level permissible for very short periods.
Magnetic circuit	Used in bearings. Made by heating up metal powder (sintered metal), baking without melting and blending in oil.
Metal	A magnet covered with iron parts that concentrates the magnetic flux.
Minimum starting voltage	A rare earth permanent magnet with very high magnetic field incidence efficiency.
Molding	Process involving injecting molten metal into casting molds and hardening the metal into the desired shape.

♦N

Neodymium	Permanent magnets made from an alloy of neodymium, iron and boron ｴ deliver the highest energy output.
Non-load revolution speed	The revolution speed when the motor is operating under non-load conditions (such as no weight).
Non-load current	The current when the motor is operating under non-load conditions.

♦O

Output sound pressure level

The sound pressure level generated by an input at the rated level and the designated bandwidth or frequency for the particular speaker.