Servo2Go supplies electromagnetic power off & power on brakes from Inertia Dynamics, including FB, MPC, and other types. Learn more about each type of electromagnetic brake or browse our products below.
What is an Electromagnetic Brake?
An electromagnetic brake slows or stops motion via an electromagnetic force that is created to apply mechanical resistance. The key components of an EM brake are: field coil, armature, and hub. When voltage or current is applied to the EM brake, the coil becomes an electromagnet, producing magnetic lines of flux. This flux travels through the gap that exists between the field coil and the armature, magnetically pulling the armature against the hub, creating a holding force. When torque is fully engaged, torque transfer is 100% efficiency. When current is removed, springs pull the armature away from the hub surface, creating a gap. In most industrial applications, a friction material is used to help slow down the wear in a clutch or brake.
The amount of time it takes to develop the magnetic field of an EM brake is determined by the amount of turns in a coil (determines how quickly the field is generated) and the air gap between the armature and the face of the brake (magnetic lines of flux diminish quickly in air).
The stopping time of an electromagnetic brake is determined by several factors such as: the strength of the magnetic field, amount of inertia, size of the air gap between the armature and hub, and the temperature.
Power Off vs. Power On Electromagnetic Brakes
There are two types of electromagnetic brakes: power off and power on. Power Off brakes stop or hold a load when electrical power is either accidentally or intentionally disconnected. These brakes were previously known as “fail safe brakes.” Power off brakes control unbalanced or vertical loads, handle occasional load holding needs, and, for high cycle rates, stop and hold a load. They are typically used on or near an electric motor and can have either standard or zero backlash hubs. Power off brakes have applications in robotics and servo motor brakes.
Power on brakes are used to stop a rotating load when the electrical power is turned on. This brake has a single face and is backlash-free (torsionally rigid). Power on brakes feature long life expectancies and durable construction. They find applications in industries such as automation, military, medical, food processing, and packaging.
You can view our selection of electromagnetic brakes below!