When it comes to your induction motors, you want the best braking system to fit your needs. This means that your current friction brake could be upgraded. Using dynamic braking to manage load inertia? How about a regenerative braking system? No matter the brake system, you need to consider DC injection braking for your AC induction motor. In this post, we share the difference between the DC brake unit and the dynamic brake system. You can start your quote with Ambi-Tech online now, or you can continue reading to learn more!
Why Use DC Injection Braking?
What’s Dynamic Braking?
Dynamic braking converts kinetic energy into heat energy within the rotor and/or stator windings to slow down a machine. When the motor switches to a braking circuit, it causes the motor to behave like a generator, which slows the motor. There is no holding torque at the end of the braking action, so a mechanical brake will need to be used to hold the shaft at a stop.
Why Dynamic Braking?
Dynamic braking is frequently used when the motor load is greater than the recommended motor speed. Periodically, motors with larger loads need to dissipate energy to maintain proper function. Although heat is wasted in dynamic braking, the initial cost to slow the machine is less than most regenerative drives.
What’s DC Injection Braking?
DC braking is a method of braking where direct current (DC) is applied to an alternate current (AC) motor after the AC has voltage has been ceased. The method involves the removal of AC and then the application of DC to slow and hold an AC motor at a stop. DC braking is an effective, efficient way to brake most AC motors in the industry; it provides a smooth, quick braking action without the negative effects of friction braking. A DC brake unit can be used on high-inertia and high-speed loads.
Without DC braking, an AC motor will coast to a stop when the AC voltage is removed. This may be acceptable for some motor operators; however, in most situations, having a way to stop an AC motor quickly and effectively is strongly suggested—especially in emergency situations.
Why DC Injection Braking?
There are a few reasons why DC brakes are great to use for AC induction motors. The first reason is that with DC brake units, there are no physical parts put into contact with the motor to slow or stop the machine. The stopping power is based on direct current injection. This means that maintenance on an induction motor utilizing DC braking is significantly less than a motor using friction regenerative, or even dynamic braking systems.
Next, DC injection brakes stop loads quickly and safely without the hassle of friction-based consequences. A high moment of inertia is what creates a struggle with friction braking systems. Dynamic braking systems exist to manage the inertia of a load; however, when a large load with high inertia needs to stop on a dime. A DC brake unit gets the job done.
Are you looking for a DC motor brake supplier? You can trust Ambi-Tech, an electronic brake supplier with more than 50 years of experience providing maximum motor-stopping power. Start a quote online now!