If the voltage applied to brake coil is increased the brake decay time will increase.

If the voltage applied to brake coil is increased the brake decay time will increase.

• A. True
• B. Sometimes
• C. False
• D. Not sure

Answer: (A)

Brake coils store magnetic energy when energized, and the current through the coil controls how strong the brake hold is. When power is removed, the current decays through the coil’s resistance, and the time it takes to drop to the level where braking re-engages (or fully releases) depends on the starting current. Increasing the applied voltage raises the current, so more energy is stored. To fall from that higher starting current to the same braking-threshold level takes longer, even though the coil’s basic time constant (L/R) is fixed for that coil. In short, higher voltage means higher initial current, which lengthens the time required for the current to decay to the point where braking changes state, so the brake decay time increases.

Brake coils store magnetic energy when energized, and the current through the coil controls how strong the brake hold is. When power is removed, the current decays through the coil’s resistance, and the time it takes to drop to the level where braking re-engages (or fully releases) depends on the starting current. Increasing the applied voltage raises the current, so more energy is stored. To fall from that higher starting current to the same braking-threshold level takes longer, even though the coil’s basic time constant (L/R) is fixed for that coil. In short, higher voltage means higher initial current, which lengthens the time required for the current to decay to the point where braking changes state, so the brake decay time increases.