A medical nebulizer is a medical device that atomizes liquid medicine into particles and delivers it to the patient's lungs through the respiratory tract. The motor is the key driving component, which uses mechanical principles to convert energy into power, so as to achieve the purpose of atomizing the liquid medicine.
Structure and working principle of medical nebulizer motor
Medical nebulizer motors usually use DC motors or AC motors, and some advanced equipment uses brushless DC motors. Its structure includes a motor main body, a circuit control module and a motor drive mechanism.
The main body of the motor is usually composed of two parts: the rotor and the stator. The rotor is usually made of permanent magnet material and has a certain cam shape to match the output of the motor drive mechanism. The stator usually includes two parts: a coil and a magnet. The coil is surrounded by a wire in the form of a single or multiple turns. The magnet can be a strong magnetic substance or an electromagnet, and is usually fixed.
The circuit control module helps the motor to complete functions such as power drive and start and stop. It mainly includes power module, control chip, signal sensor, driving circuit and other parts. Among them, the power module provides a stable DC or AC power supply for the motor; the control chip completes the speed control, direction control, and start-stop control of the motor; Changes, etc.; the drive circuit outputs the appropriate voltage and current to the motor windings to drive the motor to complete the rotation of the rotor.
The motor drive mechanism converts the rotational speed and torque output by the motor into a specific liquid medicine atomization effect. These mainly include motor exhaust vents, thorium vibrating arms or nozzles. Among them, the motor exhaust port can convert the motor rotation into airflow drive; the thorium vibrating arm can convert the mechanical vibration output by the motor into the atomization process of liquid medicine particles; and the nozzle can use the pressure nozzle to atomize the liquid medicine into particles form.
How the motor works
The process of the motor converting electrical energy into mechanical energy is to use a magnetic field to act between conductors, and generate current in the conductors, thereby generating electromagnetic force, thereby achieving the purpose of relative motion. The working principle of the motor can be explained in three aspects:
1. The role of magnetism
The magnetic force in a motor comes from the magnetic field interaction between the stator and rotor. The rotor part needs a certain magnetic induction intensity, which is used to generate a magnetic field with the stator to meet each other. For DC motors, the magnetic polarities of the stator and rotor correspond, and the force surface generated by the suction force becomes the magnetic electromotive force. When current flows through the path of the rotor, a magnetic induction is generated in it, which forms a magnetic circuit. At this time, when the power of the motor is applied, the magnetic field between the stator and the rotor can be changed accordingly.
2. The role of electromotive force
Electromotive force refers to the electric effect produced by the electric charge moving in the conductor under the action of the magnetic field. The electromotive force is often the basis for the operation of the motor, which can generate the current in the conductor, so as to drive the motor.
3. Effect of thrust and torque
The torque and thrust of the motor are related to the load. If the motor has no load, the torque and thrust are closely related to the parameters and working conditions of the motor. Generally speaking, the larger the current of the motor, the greater the torque and thrust. The value is also larger.
To sum up, in the process of drug atomization, the medical nebulizer motor uses permanent magnets or electromagnets to generate magnetic induction intensity and generate electric potential, thereby driving mechanical movement, and then realizing the purpose of drug atomization.
