Transducer is a kind of device that is used at controlling electromotor rotate speed, the rotate speed of transducer adjustment electromotor comes true through changing the frequency of voltage of electric machinery power source, the synchronous rotate speed that power source frequency jumps over big electric machinery is bigger. This is the culminating function of transducer, carry a name actually " transducer " the equipment that also can see this is frequency of a change.
Rough simple introduction is merely below basic principle, let us have a general idea.
At present general transducer is used hand in - straight - the develop that hand in attacks structure, the communication town report that secures frequency first namely passes rectification bridge and flowing capacitance to become volts d.c. .
Next the three-phase voltage that bridge of inversion of three-phase of repass of this volts d.c. becomes frequency to be able to change receives electric machinery to go up, pursue below namely circuit of three-phase inversion bridge.
Above is the basic structure of hardware part, the implementation of transducer function returns those who need software to cooperate, a basic function of software is on bridge of control three-phase inversion 6 IGBT connect.
The core here is when each IGBT debut, when to close, corresponding control strategy also is compared more quite complex, the thing that involves is more, if control of SPWM, SVPWM, vector, direct torsion is controlled,wait a moment.
Above can spread out large space each times to discuss, here does not spread out to just show vector pilot idea simply. Three-phase induction electric machinery or electric machinery of synchronism of three-phase permanent magnetism are the thing of a strong coupling, electric machinery of its encourage do as one pleases controls unlike easily in that way.
So vector pilot thought passes the coordinate commutation with one complex caboodle to be equivalent of three-phase electric machinery dc machine namely, in order to achieve steady control performance.
The note 2019-3-29 of buccal mouth wood
