Permanent magnet brushless servo direct drive giant industrial ceiling fans, used the inner rotor technology and servo technology, creating a low speed high air volume, and it operates like a smooth driving car. A sudden brake while also exists inertia, but this is not an inertial already, become a big damage, and even the giant fans of high speed operation and shut down suddenly. Therefore, people don't want to install the high speed fans. This is a permanent magnet brushless servo drive giant industrial ceiling fans of charm.