Brushless direct current motor is used in brushless motor automatic door opener. These motors are synchronous electric motors which have magnets powered by direct current which moves the rotors inside the stator. These motors do not use brushes to create rotation, but instead use a step motor controller for the rotation which transforms electrical energy into mechanical energy. For example, an aluminum alloy brushless dc motor which is used on auto swing door opener has a power of 75w. It works at a voltage of 24v. It is used in a single or double leaf door. The door opens and closes in about three to nine seconds. The door can remain open for about one to ten seconds. The brushless motors are mainly used for motion control and positioning.
Another example of brushless motor automatic door opener is the motor automatic sliding glass sensor door opener. The direct current powers the motor at a power of 85w at a voltage of 36v. It is surface mounted on a single open or double open door. The door can be kept open for two to twenty seconds.
The Chinese brushless motor automatic door opener for sliding door operates at a voltage of 24v with a power of 55w. The door opener uses advanced microcomputer controller which enhances the precision of the door operation. The door at the time of closing, on sensing a moving object approaching the door or an obstacle prevents damage by going backwards. The sensors are both microwave and feet sensors. The door can be operated by long distance buttons, feet touch and elbow touch. It also has features like fingerprint identification access and password access. It is simple to install and in the event of a power failure, the door can be operated manually.
The brushless motor automatic door opener operating at a voltage of 12v is used for customized automatic doors. It is also surface mounted and provides an opening and closing speed between two to eight seconds. The door can be held open for about one to thirty seconds.
The brushless motor automatic door opener for a garage door can be easily controlled with a computer controlled board in the garage door. The dc motor also allows the manufacturers to either accommodate more parts in the motorhead box to enhance the features of the door or design a small motorhead box. A battery backup system can be also be installed inside the motorhead box for dealing with power failures unlike with ac motors which are bulky.
