The stepper motor is a pulse signal transformation into the corresponding angular displacement (or line displacement) of the electromagnetic device is a special motor. Strictly proportional to its angular displacement and number of input pulses, synchronized with the input pulse in time, so long as the control input pulse number, frequency and the motor winding energized phase sequence, can obtain the desired angle, speed and The direction of rotation. When there is no pulse input, the air gap magnetic field excitation of the winding power supply enables the rotor to maintain the original position in the positioning state. It is this characteristic, the stepper motor and modern digital control technology combining. Stepper motor control precision, speed range, low-speed performance is not as good as traditional closed-loop control of DC servo motor. 2.4 G technology is a part of green laser pointer with remote control.
Therefore, the main applications in precision is not particularly high occasions. The rapid development of modern semiconductor power component switching frequency to speed up a lot to improve the performance of the drive motor. Microprocessor speed is also faster and faster, and can realize AC motor control placed in a rotating two-axis orthogonal coordinate system, proper control of the AC motor in the two-axis current component to achieve quite similar to the DC motor control and DC motor properties. The addition has been a lot of functionality required by the microprocessor will control the motor in the chip, and smaller and smaller; like the analog / digital converter (Analog-to-digital converter the, AnalogAnalog ADCs), pulse width modulation (pulse wide modulator PWM) The pulse PWM). green laser pointer with remote control is composed of a emitter, a receiver and a USB interface(optional).
The brushless DC motor that is electric ADC) sub control of AC motor commutation, similar DC motor features a DC motor bodies on the shortcomings of an application. This design uses brushless DC motors in principle between the motor between the AC and DC motor. This motor stator windings and AC synchronous and induction motor stator windings are the same. However, the difference between it and the AC motor is the excitation voltage is a single DC voltage, which is set by the DC voltage by the internal motor Hall position sensor to convert the phase difference of 1200 angle of the DC pulse, alternating excitation of each phase winding, and then rotating magnetic field within the motor stator core to form a step-drive permanent magnet rotor synchronous operation. The advantages of the Infrared products green laser pointer with remote control are low costs and prices.
So this motor in the structure of permanent magnet AC synchronous motor is almost the same, but more than a Hall position sensor. Hall position sensor brushless motor using the DC power supply, it is the biggest difference to the DC motor, it does not necessary by the DC motor brushes and commutator composed of reversing device, it is only mounted on the motor shaft, according to the pole face of the rotor poles and stator windings corresponding to the transient position to determine the time of the stator windings are energized, the incentive to produce alternating phase sequence must be rotating magnetic field of the motor is running. Be seen that the structure of the brushless DC motor with AC motor is simple, reliable operation, easy maintenance, a number of advantages. Usually, the distance between emitter and receiver of green laser pointer with remote control is less than 7 meters.
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