The object of the present invention is to provide that a kind of electromechanical conversion efficiency height, output speed and moment of torsion are big, the rotary type travelling wave ultrasonic motor of long service life.
Another object of the present invention is to provide a kind of curtain open/close device that utilizes above-mentioned Driven by Ultrasonic Motors.
The rotary type travelling wave ultrasonic motor that the present invention proposes is made up of stator, rotor, rotating shaft, flexible member, base, outer cover and piezoelectric element etc., between stator and the rotor unworn liner is arranged, piezoelectric element links to each other with stator, piezoelectric element adopts two piezoelectric ceramic pieces of 15 ° at interval spatially, and flexible member is combined by the disk spring and the rubber blanket of " fan-shaped ".
Further improvement to above-mentioned ultrasound electric machine is that unworn liner wherein adopts Polymer Friction Materials; Or warm electrode glue piezoelectric ceramic piece and unworn liner in adopting; Or both adopt simultaneously.
The curtain open/close device that the present invention proposes is made up of above-mentioned ultrasound electric machine and driving power thereof, curtain haulage gear, Curtain rod etc., the output of ultrasound electric machine directly links to each other with driving wheel in the curtain haulage gear, and the input of ultrasound electric machine links to each other with the output of its driving power.
The basic structure of rotary type travelling wave ultrasonic motor is made up of stator, rotor, rotating shaft, flexible member, base, outer cover and piezoelectric element etc., stator 8, rotor 4, flexible member 2 and 3, base 7 etc. connect together by rotating shaft 6, thereby regulate the tightness acquisition rotor of flexible member and the suitable normal pressure between the stator by securing member 5, so that motor produces good operation conditions; Flexible member originally adopted the spring leaf of " cross ", its pressure distribution is inhomogeneous, shock-absorbing effect is poor, adopt the flexible member that combines by the disk spring 2 of " fan-shaped " and rubber blanket 3 among the present invention, make that pressure distribution is even, shock-absorbing effect is good, thereby rotor operation is steady, can obtain bigger moment of torsion and rotating speed is improved; The unworn liner 9 that is arranged between stator and the rotor adopts suitable friction material to make, can stick on the lower surface of rotor or the upper surface of stator by bonding agent, its effect is to make the be expert at effect of ripple and normal pressure of stator produce down the moment of friction that promotes rotor operation; Piezoelectric element 10 also can be connected with stator by bonding agent, makes stator produce suitable capable ripple under the effect of the electric energy of input piezoelectric element; Piezoelectric element in the past only adopts a slice piezoelectric ceramic piece, the present invention adopts spatially at interval 15 ° of two piezoelectric ceramic pieces and both, promptly pass through spatially at interval 15 ° of the polarity positions of two piezoelectric ceramic pieces of area polarizing, can obtain pure capable ripple like this, thereby obtain very high electromechanical conversion efficiency; Outer cover 1 is fixed on the base by securing member, makes motor become as a whole.
On the basis of technique scheme, the present invention has also adopted HIT-2 type Polymer Friction Materials to make unworn liner.This friction material has good wear resistance and heat-resisting quantity, and its confficient of static friction is more than 0.4, and the heatproof index is normally used efflorescence not yet in 3000 hours more than 100 ℃, thereby can obtain bigger moment of torsion and long useful life.
In addition, the present invention has also adopted in the BH-4 type warm electrode glue to paste piezoelectric ceramic piece and unworn liner.Because its heatproof index is also higher, reach more than 100 ℃, cooperate above-mentioned friction material to use, can obtain long useful life.
Because above-mentioned ultrasound electric machine has realized that electromechanical conversion efficiency height, output speed and moment of torsion are big, long service life, therefore can be used for driving curtain open/close device.Curtain open/close device of the present invention is made up of ultrasound electric machine 14, driving power 11, curtain haulage gear 13, Curtain rod 15 etc., the output of ultrasound electric machine (being the outer end of rotating shaft) driving wheel 12 direct and in the curtain haulage gear is connected, be that machine shaft directly drives load, and do not need as electromagnetic machine, to pass through reduction gearing mechanism, therefore, stable drive, compact conformation, and do not have the noise that electromagnetic machine and reduction gearing mechanism thereof produce; The startup of ultrasound electric machine, turn to rotating speed etc. and controlled by its driving power, driving power adopts the required two-phase power supply of travelling wave supersonic motor, its input links to each other with civil power, output links to each other with the input of ultrasound electric machine, by the action (switch can adopt manual form, also can adopt the form of remote control) of switch control ultrasound electric machine, when ultrasound electric machine is worked, promptly drive the action of curtain haulage gear, thereby drive the folding of curtain 16.
Ultrasound electric machine of the present invention is compared with existing products, and its performance has had large increase, and electromechanical conversion efficiency reaches 45%, and rotating speed reaches 300 rev/mins, and moment of torsion reaches 1.9 kilograms centimetres, reaches no-failure life more than 3000 hours.
Curtain open/close device of the present invention has also been realized quiet work except the performance that has above-mentioned ultrasound electric machine itself concurrently and reached, and compact conformation, stable drive.