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Controlled inverter
time2012/06/25
The brushless DC motor is self-control inverter. It is the general inverter. Its output frequency is not an independent regulator, but by the rotor position detector installed in the synchronous motor axis control. Whenever the rotor turned a certain position (for example 90 ° or 120 ° electrical angle), the position detector will produce a corresponding signal, acting on the corresponding semiconductor components, so that the corresponding phase winding energized to produce torque. The motor rotor turned every one pair of poles, the semiconductor components in turn turns on for a week, AC inverter output corresponding to changes in a cycle. Controlled inverter output frequency and speed of the motor is always in sync, does not appear out of step phenomenon. In small brushless DC motor, the inverter transistors. The transistor has the ability to self-shutdown as long as its base on the control signal disappear, the transistor on its own shutdown, so the control is relatively simple. Larger brushless DC motor, inverter thyristors. Thyristor does not turn-off ability, can not rely on to remove the trigger signal to turn off. Therefore, when a phase current deadline to another phase power, how to turn off the thyristor of the original pilot, the current transfer to the new phase thyristor between the thyristor converter is crystal thyristor motor of the key technology.
Position detection is an important component of the brushless DC motor. It determines the armature windings of each phase began to live the moment. It acts as a general DC motor brushes. Change the position of the detector signal time (phase), the equivalent of the DC motor to change the location of the brush in the space, has a great influence on the characteristics of the brushless DC motor.