“Servo & throughout; The term comes from Greek & other; The slave & throughout; The meaning of. “Servo motor & throughout; Can be understood as absolutely obey the control signal of motor command: before the control signal, rotor motionless; When the control signal, rotor rotating immediately; When the control signal disappears, the rotor can immediately halt. servo motor is used as actuators in automatic control device of micro motor, its function is to convert electrical signals into a shaft angular displacement or angular velocity. The working principle of the
1, servo system (伺服机制)Is to make the object location, location, status is accused of output can follow the input target (Or a given value)Any change of the automatic control system. Servo positioning by pulse, basically can understand it, servo motor to receive a pulse, will rotate one pulse of the corresponding point of view, so as to realize the displacement. because, servo motor itself have a pulse function, so every rotation Angle of a servo motor, send out the corresponding number of pulses, in this way, and the servo motor to accept pulse forming the echo, or closed loop, as a result, the system will know how many pulses sent to the servo motor, how much charge pulse back again at the same time, in this way, can be very precise control of the motor rotation, so as to realize accurate positioning, can reach 0. 001mm。
1 dc and ac servo motor, dc servo motor is divided into a brush and brushless motors. brush motor of low cost, simple structure, big start torque, wide speed range, easy control, need to be maintained, but the maintenance is not convenient,In carbon brush)To produce electromagnetic interference, has asked for the environment. So it can be used in ordinary industrial and civil occasions is sensitive to the cost. brushless motor has small volume, light weight, the output is big, fast response, high speed, small inertia, the rotation smooth, stable torque. Intelligent control is complex, easy to implement, the flexible electronic commutation, can square wave or sine wave phase commutation. Motor free maintenance, high efficiency, low operating temperature, electromagnetic radiation is very small, long life, can be used for all kinds of environment. 2, ac servo motor and brushless motor, divided into synchronous and asynchronous motor, the current motion control with synchronous motor, in the scope of its power is big, can do a lot of power. Big moment of inertia, high rotational speed is low, and with the increasing power and fast. Thus suitable for the application of low speed running smoothly. 3, the inside of the servo motor rotor is a permanent magnets, drive control of U/V/W three-phase electric form of electromagnetic field, under the action of rotating rotor in this field, at the same time, the motor with encoder feedback signal to drive, drive according to the feedback value compared with the target, adjust the Angle of the rotor rotation. The precision of servo motor is determined by the precision of the encoder (Line number)。 ac servo motor and brushless dc servo motor on the function of the difference: ac servo is better, because it is a sine wave control, torque ripple is small. Dc servo is trapezoidal wave. But dc servo is simpler and cheaper.
permanent magnet ac servo motor permanent magnet ac servo motor compared with dc servo motor's main advantages are: (1) no brush and commutator, so that the work is reliable, the maintenance and low maintenance requirements. 2 stator winding heat dissipation is more convenient. (3) inertia small, easy to improve the rapidity of the system. (4) adapted to high speed large torque working condition. 5] with power under a relatively small volume and weight.
