VFDB 400


VFDB brakes are designed to operate in dynamic situations. Existing motor brakes are designed as holding brakes, to be applied when the VFD has brought the motor to zero rpm. Their friction material is specifically formulated to have a high static friction coefficient. Typically, this is accomplished at the sacrifice of the dynamic friction coefficient. At 1500 rpm motor speed, the typical motor brake has about 50% of its static torque.

Therefore, a design engineer is faced with a dilemma, select a brake on static torque for the sake of design cost or significantly upsize the brake to handle the dynamic torque. The VFDB brake eliminates this dilemma. If there is the potential for a critical situation in which the motor brake has to stop a dynamic load to avoid serious consequences, then the VFDB brake is the best choice. To assure performance and validate each VFDB’s dynamic torque, PT Tech tests these brakes under extreme operating conditions on our extensive line of test stands prior to shipping.

VFDB brakes are the only motor mounted brakes to address the issue of low frequency friction-induced vibration during high-speed stops that can damage expensive drive components, including bending  motor shafts.

  • Higher maximum engagement speed than competitive products.
  • Maintains torque in critical high-energy applications.
  • Prevents vibration during high-speed stops that can damage drive equipment.
  • Compact design allows for a small mounting flange to help reduce motor cost.
  • Designed to allow better airflow across motor to avoid the extra cost of external motor cooling fans.
  • Uses common-wear parts to reduce critical spare parts inventory.
  • One easy adjustment during entire wear life – loosen six bolts, remove three shims, and re-tighten six bolts – done!
  • Easy to rebuild.

Technical Specs

Static Torque New 4400 nm
Static Torque Worn 4000 nm
Dynamic Torque Worn 5000 nm
Max Freewheeling Speed 2200 rpm
Max Engagement Speed 1500 rpm
Holding Voltage 50V DC Min
Excitation Voltage 205V DC Min
Airgap Min/Max 0.8/2.0 nm

Request More Info

View Brochure