There are many types of motors, which can be installed in different machines to support the operation of machines. Because of the different types of machinery, different motors are needed to support the operation. One of the most representative motors is the EC motor. Let’s take a look at the general situation and characteristics of EC motor.
Brushless DC motor with magnetic-sensitive position sensor, its magnetic-sensitive sensor (such as Hall element, magnetic-sensitive diode, magnetic-sensitive polar tube, magnetic-sensitive resistor or special-purpose integrated circuit, etc.) is mounted on the stator assembly, which is used to detect the magnetic field changes caused by permanent magnet and rotor rotation.
The brushless DC motor with photoelectric position sensor is equipped with photoelectric sensor in a certain position on the stator component, and the light source is light-emitting diode or small bulb. When the rotor rotates, the light-sensitive components on the stator will generate pulse signals intermittently at a certain frequency due to the effect of the mask.
Using electromagnetic position sensor brushless dc motor, is in the electromagnetic sensors are installed on the stator component parts (such as the coupling transformer, close to switch, LC resonance circuit, etc.), when the permanent magnet rotor position changes, electromagnetic effect will make the electromagnetic sensor produces high frequency modulation signal (the amplitude changes with the rotor position).
superiority
Dc motor has a rapid response, large starting torque, rotating speed of from zero to rated speed can provide the rated torque performance, but the advantages of dc motor is also its drawback, because the direct current machine to produce a constant torque under the rated load performance, the armature magnetic field and rotor magnetic field must be constant to maintain 90 °, this is about to borrow from the carbon brush and commutator. Carbon brush and commutator will produce spark and toner when the motor is rotating, so in addition to causing component damage, the use of the occasion is also limited. Ac motor without carbon brush and commutator, maintenance-free, strong, widely used, but in terms of characteristics to achieve the same performance as DC motor must be achieved by complex control technology. Nowadays, the semiconductor develops rapidly and the switching frequency of power components is much faster, which improves the performance of the driving motor. Microprocessor speed is also getting faster and faster, can realize the ac motor control in a rotating two axis coordinate system, appropriate control of ac motor current components in the two axis, to achieve similar dc motor control and has the same performance as dc motor.
In addition, many microprocessors have done the necessary functions to control the motor in the chip, and the size is becoming smaller and smaller; Like analog-to-digital Converter (ADC), Pulse Wide Modulator (PWM)… And so on. Brushless DC motor is an application that electronically controls the commutation of ac motor to obtain similar characteristics of DC motor without the loss of DC motor mechanism.
To sum up, EC motor is a relatively superior performance and relatively novel motor. Ec motors have good performance and superior control technology, so they are more and more widely used in modern machinery.