RESISTORS

Dynamic Braking Resistors

Braking resistors used with inverter-controlled AC and DC motors to dissipate regenerated energy and control deceleration.

DYNAMIC BRAKING / RESISTIVE DISSIPATION

REGENERATIVE
ENERGY → BRAKING
RESISTOR → THERMAL
DISSIPATION

Illustrative braking duty; resistor sizing follows the drive application.

TECHNICAL OVERVIEW

Purpose and operating principle.

When a driven motor operates as a generator during deceleration, the generated electrical energy can be converted to heat through a correctly selected dynamic braking resistor. Resistor design depends on braking period, duty cycle, motor power and the specific application.

APPLICATION

AC / DC motors

CONTROL

Inverter braking

SELECTION

Ohmic + watt rating

DUTY

Braking period / cycle

KEY FEATURES

Project-relevant characteristics and selection points.

Converts regenerated motor energy into heat during braking.

Required resistor power depends on braking duration and cooling interval.

Ohmic value must not be lower than the inverter manufacturer's stated braking-resistor value.

Higher resistance can increase braking time.

When braking time is unknown, LMZ source guidance recommends conservative wattage selection.

Selection is based on motor power, maximum load, braking time and operating cycle.

RESISTOR SYSTEMS

Electrical and thermal duty define the final resistor configuration.

LMZ resistor systems are selected around the network, current, voltage, thermal duty, operating cycle and environmental requirements of the application.

Back to Resistors