What are the factors that affect the efficiency of the BLDC of the permanent magnet brushless DC mot

The main difference between cryogenic servo motors and normal motors is the temperature range in which they are designed and used. Ordinary Motors: Ordinary motors are motors that typically operate at room temperatures and are designed and manufactured with the temperature conditions of general industrial and household applications in mind.

The temperature range of these motors is typically 0??c (Celsius) to 40??c.

In this range, the performance and reliability of ordinary motors can be well guaranteed. Low-temperature motors: Low-temperature servo motors are specially designed and manufactured for use in low-temperature environments.

These motors are capable of operating in more extreme low temperature conditions and have higher cold resistance. Their temperature range is usually -40??c or lower, e.g. -60??

c。Low-temperature motors play an important role in applications such as extremely cold regions, high altitudes, refrigeration industry and scientific experiments...

The motor used in DC inverter air conditioner is brushless DC (BLDC). The brushless DC motor is composed of a motor body and a driver, which is a typical mechatronics product. The stator winding of the motor is mostly made of three-phase symmetrical star connection, which is very similar to the three-phase asynchronous motor.

A magnetized permanent magnet is glued to the rotor of the motor, and a position sensor is installed in the motor to detect the polarity of the rotor of the motor. The driver is composed of power electronic devices and integrated circuits, and its functions are: to accept the start, stop and braking signals of the motor to control the start, stop and braking of the motor; Accept the position sensor signal and forward and reverse signal, which is used to control the on-off of each power tube of the inverter bridge to generate continuous torque; Accept speed command and speed feedback signal to control and adjust the speed; Provide protection and display and much more.

The DC motor has a fast response, a large starting torque, from zero speed to the rated speed has the performance of providing the rated torque, but the advantage of the DC motor is also its disadvantage, because the DC motor to produce the performance of constant torque under the rated load, the armature magnetic field and the rotor magnetic field must be maintained at 90°, which requires carbon brushes and commutators. Carbon brushes and commutators generate sparks and toner when the motor rotates, so in addition to causing damage to components, the use of carbon brushes and commutators is also limited. AC motors do not have carbon brushes and commutators, so they are maintenance-free, sturdy and widely used, but in terms of characteristics, they need to use complex control technology to achieve the performance equivalent to DC motors.

Today's semiconductor development is rapid, and the switching frequency of power components is much faster, improving the performance of drive motors. The speed of the microprocessor is also getting faster and faster, which can realize the AC motor control in a rotating two-axis Cartesian coordinate system, and properly control the current component of the AC motor in the two axes, so as to achieve similar to DC motor control and have the same performance as the DC motor.

There are mainly the following points: 1. The brushless DC motor is powered by square wave current, which can provide a more lively and excessively high torque volume ratio, and the output torque is 15% larger under the same conditions 2. The magnetic field distribution and the induced electromotive force of the trapezoidal wave generated in the motor are simpler than the magnetic field distribution of the sine wave and the electromotive force of the sinusoidal change, so the structure of the brushless DC motor is simple and the manufacturing cost is low3. For the permanent magnet synchronous motor, because the stator current is a sinusoidal function of the rotor position, The system requires a high-resolution position sensor, which is complex and expensive. 4. The inverter that generates square wave voltage and current is simpler than the inverter that generates sinusoidal voltage and current, and the control is much simpler, so the control of brushless DC motor is simple and the cost of controller is low.

Brushless DC motors can be divided into two categories according to their working characteristics:

1 Brushless DC motor with DC motor characteristics.

Motors with both the back electromotive force waveform and the supply current waveform are rectangular waves, which are called rectangular wave synchronous motors, also known as brushless DC motors. Powered by a DC power supply, these motors detect the position of the main rotor with the help of a position sensor, and the detected signal triggers the corresponding electronic commutation circuit for contactless commutation. Obviously, this brushless DC motor has all the operating characteristics of a brushed DC motor.

2 Brushless DC motor with AC motor characteristics.

Motors in which both the back EMF waveform and the supply current waveform are sine waves are called sine wave synchronous motors. These motors are also powered by a DC power supply, but an inverter converts the DC power into alternating current, which then drives a normal synchronous motor. As a result, they have all the operating characteristics of synchronous motors.

The information is from the list of motor libraries

Summary. Hello, glad to answer for you, what does permanent magnet mean? Permanent magnet generally uses permanent magnet material as the motor pole, the so-called permanent magnet refers to the material like a magnet that does not need an external current to exist in a magnetic field, which is relative to the magnetic pole that needs to be excited, that is, the kind that has an external current to have a magnetic field is not a permanent magnet.

The main function is to generate a magnetic field, and in the process of rotation, the winding cuts the magnetic inductance line generated by it to generate electricity or vice versa. Motors that use permanent magnets synchronously are synchronous motors.

What does permanent magnet mean in permanent magnet brushless synchronous motor? + Rotor adopts DC refers to +

Hello, very sail oak is happy to answer for you, what does permanent magnet mean? Permanent magnet generally uses permanent magnet material as the motor pole, the so-called permanent magnet is like a magnet that does not need an external current to exist in a magnetic field, this is a relative need to excite the magnetic pole, that is, there is an external current to have a magnetic field is not a permanent magnet. The main function is to generate a magnetic field, and in the process of rotation, the winding cuts the magnetic inductance line generated by it to generate electricity or vice versa.

The motors that use permanent magnets synchronously are all co-trapped cavity step motors.

The rotor is made of permanent magnet material.

What is permanent magnet DC? It is a machine that uses permanent magnets to excite and convert direct current energy into mechanical energy. It is mainly used in the case where the power supply is direct current and there are linear control requirements for the device, such as various motors on the car, which are used in large quantities.