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2022-08-06
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According to foreign media reports, engineers usually choose between DC motors or AC motors. Recently, the electronic rectifier (EC) motor has also added the problem of material experiment journey: scuffle. This equipment helps to control energy output and improve energy efficiency. The equipment is advanced in technology and is currently replacing DC motor and AC motor to realize efficiency regulation. Electronic rectifier motor and DC brushless motor are controlled by external electronic circuit board, which can improve control and efficiency

principle of DC and AC motors

DC motors use carbon brushes and rectifier rings to change the direction of current and magnetic field electrodes in the rotating armature. The interaction between the inner rotor and the fixed permanent magnet will cause the motor to rotate

according to maxon motor, the DC motor is limited by the brush system, and its service life is hours. If it is under extreme load, it will be less than 100 hours. Under good working conditions, the service life of some motors may reach 15000 hours. In addition, high-speed rotation is limited to rectification, and the maximum speed is usually close to 10000 times per minute (RPM)

DC motor has high efficiency rate, but there are certain specific losses. The factors leading to loss efficiency include initial resistance of winding, brush friction and eddy current losses

AC induction motors adopt a series of windings, which are controlled by the AC input voltage and generate the stator field, thus generating the rotor field. Synchronous motor is another kind of AC motor, and its supply frequency precision is high. When the current passes through a slip ring or a permanent magnet, a magnetic field will be generated. The running speed of synchronous motor is faster than that of induction motor, and the speed of the latter is limited by the slip ring of asynchronous motor

AC motor means that the operating value of the equipment will correspond to a specific point on the performance curve, which will be consistent with the peak efficiency of the motor. If the motor is not operated according to the value corresponding to this point, the efficiency of the motor will be greatly reduced. AC motors generate induced current on the rotor, which in turn generates a magnetic field, which will cause additional energy consumption. Therefore, the efficiency of AC motor is lower than that of DC motor. In fact, the efficiency of DC motor is more than 30% higher than that of AC motor, because the permanent magnet will produce secondary magnetic field

the figure above compares the motor efficiency of electronic rectifier motor, three-phase induction AC motor, single-phase AC induction motor and shaded pole motor

introduction and advantages of electronic rectifier motor

electronic rectifier motor is a brushless DC motor controlled by external electronic devices, which may be electronic circuit boards or variable frequency drives. The implementation of mechanical rectification depends on the electronic circuit. The circuit board can change the phase of the fixed winding to ensure the rotation of the motor and provide an appropriate amount of armature current. If the current is transmitted in the right direction within a precise time period, higher accuracy can be achieved. Since the speed of the electrode is controlled by external electronic devices, the electronic rectifier motor has no synchronous speed limitation

electronic rectifier motor has the following advantages: since this kind of motor has no brush, it will not produce sparks or shorten the service life of the motor due to the brush, and will not waste energy, because it uses electronic devices to control the stator, and its performance and controllability are good. Its operating temperature is lower than that of induction motor. The smaller the size of the motor, the more space can be saved. When the manufacturer adopts external rotor, even more space can be saved

if the electronic rectifier motor is used, the power distribution is also cleaner. Brushless DC motor is driven by a separate DC power supply. The power supply of AC motor will generate additional costs, and the design is more complex. The electronic rectifier motor can be directly connected to the AC main power supply, but it does not completely depend on voltage or frequency. Small voltage changes will not affect the motor output

to understand the differences among DC motor, AC motor and electronic rectifier motor

if the electronic rectifier motor is compared with AC shaded pole motor or AC permanent split capacitor motor, it will be found that the efficiency range of shaded pole motor is 15%-25%, and the range of permanent split capacitors (PCS) is 30%-50%, The efficiency of the electronic rectifier motor ranges from 60% to 75%

electronic rectifier motors can be used in low-power output applications, such as small fans, servo motors, motion-c fixture iiicontrol systems. At present, new methods are being tried to apply this kind of motor to high-power output equipment such as conveyor belts and condenser units

in terms of speed control, the electronic rectifier motor has multiple speeds, of which Kunming Iron and Steel Co., Ltd. and Lianyuan Iron and Steel Co., Ltd. have lowered the purchase price control function respectively, and the speed controller is its standard accessory. AC motors also provide most of the control functions and an external speed controller option. The external controller can adjust the transformer primary voltage of the AC motor and change the sine wave, which will affect the service life of the motor and increase the noise

for the electronic rectifier motor, the pulse width modulation of the rectifier circuit is Ma, the voltage is V, and the motor speed is controlled within the range of 10%-100% for regular inspection. Only the integrated circuit can be used to monitor the electronic rectifier motor, and the designer can provide the corresponding feedback information. The electronic rectifier motor can also provide soft start with low noise and motor temperature

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