Maple Audio Works Technology Overview - 2
Wire Composition (Common to all of our products.)
Family: Copper
Product Form: wire
Processing: Continuous cast hot rolled, then a succession of annealing and drawing at different temperature to allow a continuous single
Nominal Composition: Cu 99.99
Material Copper: OFE Oxygen Free Electronic.
Application Data Copper N0: C10100, As .0005, Sb .0004, P .0003, Te .0002
Self-Inductance
Self-inductance is the property of a circuit where a change in current causes a change in voltage.
where:
VL = the induced voltage in volts, V
L = the value of self-inductance in henries, H
= the rate of change in current in amperes per second, A/T
The amount of induced voltage (VL) is proportional to the rate of change of current flow (di/dt).
- When there is no change in current, di/dt = 0 and VL = 0.
- When the current is changing very rapidly, di/dt is a large value and so is the amount of VL.
- When the current is changing very slowly, di/dt is a small value and so is the amount of VL.
Self-inductance is also more simply known as inductance.
The self-induction effect is multiplied by the value of inductance, L.
- Increasing the value of L increases the amount of voltage that is induced in response to a change in current.
- Decreasing the value of L decreases the amount of voltage that is induced in response to a change in current.
Inductance and Inductors
Inductance is measured in units of Henries (H).
The math symbol for inductance is L.
The graphical symbol for an inductor resembles a coil of wire:
One henry is the amount of inductance that is required for generating one volt of induced voltage when the current is changing at the rate of one ampere per second.
VL = 1V when L = 1 H and di/dt = 1 A / sec
Inductive Sine Waveforms
- The amount of induced voltage is proportional to the rate of change of current through an inductor or a coil
- The value of a sine waveform is constantly changing.
- Therefore, when a sinusoidal current flows through an inductor (IL), the induced voltage (VL) changes constantly.
MUTUAL INDUCTANCE
Mutual inductance takes place between two conductors or coils. These coils have a certain amount of inductance of their own, L1 and L2.
where:
M = mutual inductance in henries
k = coefficient of coupling between two inductances
L1 and L2 = values of the two inductances
Unit of measure: henries (H)
Mutual inductance is the electrical property of circuits that enables a current flowing in one conductor (or coil) to induce a current in a nearby conductor (or coil).
Coefficient of Coupling
Two conductors or coils are said to be coupled when the are arranged so that a changing magnetic field created by one of the coils can induce a current in the other coil.
The coefficient of coupling (k) between two conductors or coils indicates the degree of coupling between them.
The values of k are between 0 and 1--the larger the value, the better the coupling.
When k = 0, there is no coupling at all between the conductors or coils This condition occurs when the conductors are too far apart ot interact or are separated by a magnetic shield.
When k = 1, there is perfect coupling between the conductors or coils. There is no such thing as perfect coupling. However a good (close to 1) coupling can be achieved by keeping a constant in wire size and a minimum air or core space.
