General projection curtain is divided into two kinds of motor, tubular motor and synchronous motor.
Tubular motor is a high performance tubular motor comprises a tubular shell and through a bearing seat for supporting a drive in the tubular casing assembly, brake assembly and travel control assembly, the brake assembly includes a motor shaft right fixing piece, right axis, electromagnet right bearing fixing part, an electromagnet, a large rod brake mechanism; motor fixed on the right end of the right speed motor shaft is fixed, with right end of the support shaft; the electromagnet right bearing fixing part is arranged on the right axis, the electromagnet is fixed on the electromagnet right bearing fixing part, arch rod brake mechanism is installed on the right shaft and is located in the cavity between the right shaft and the tubular shell in electromagnetic drive a large brake rod brake mechanism. The utility model increases the elastic force of the pressure spring to reduce the power of electromagnet through the connecting rod principle, has the advantages of energy saving, quick start, brake assembly has the advantages of novel design, reasonable structure, high braking speed, braking effect is good, the advantages of long life. The utility model can be widely applied to various electric lifting doors and windows, shading systems, projection screens and other products.
In contrast to a tubular motor, the synchronous motor is less rotational and torsional than the tubular motor, and the large electric screen does not use synchronous motors.
A synchronous motor is an alternating current motor with a torque generated by the interaction of an exciting magnetic field with a DC rotating magnetic field and an armature rotating magnetic field.
