Introduction and advantages of electronic rectifier motors
An electronically commutated motor is a brushless DC motor that is controlled by external electronics. The electronic device may be an electronic circuit board or a variable-frequency drive. The implementation of mechanical commutation depends on the electronic circuitry. The board can change the phase of the fixed winding and ensure that the motor rotates to provide an appropriate armature current. Higher accuracy can be achieved if current is delivered in the correct direction over a precise period of time. Since the rotational speed of the electrodes is controlled by external electronics, the electronically commutated motor does not have a limited synchronous speed.
The electronic rectifying motor has the following advantages: Since this type of motor has no brush, it will not produce Mars or the motor will be shortened due to the brush, and will not waste energy, because it uses electronic devices to control the stator, its performance and controllable Good sex. Compared to induction motors, their operating temperatures are lower. The smaller the motor size, the more space is saved, and even more space is saved when the manufacturer uses an external rotor.
If an electronically commutated motor is used, the power distribution is also cleaner. The brushless DC motor is driven by a separate DC power supply, and the AC motor's power supply generates additional cost and is more complicated in design. The electronically commutated motor can be directly connected to the AC mains, but it does not depend entirely on voltage or frequency, and small voltage variations do not affect the motor output.
If the electronically commutated motor is compared with an AC shaded pole motor or a fixed split capacitor AC motor (ACpermanent-splitcapacorormotor), it will be found that the efficiency range of the shaded pole motor is 15%-25%, fixed phase separation. Capacitor-type alternating current motors (PCS) range from 30% to 50%, while electronically commutated motors range from 60% to 75%.
Electronically commutated motors can be used in applications with low power output, such as small fans, servo motors, and motion-control systems. New methods are currently being attempted to apply this type of motor to high power output devices such as conveyors and condenser units.
In terms of control speed, the electronically commutated motor has multi-speed control function, and the speed controller is its standard accessory. AC motors also offer most control functions and offer an optional external speed controller. The external controller can adjust the transformer's transformer voltage (incomingvoltage), which can change the sine wave, which will affect the service life of the motor and increase the noise.
For electronically commutated motors, the pulse-width modulation of the rectifier circuit is 4-20 mA, the voltage is 0-10 V, and the motor speed is controlled within the range of 10%-100%. The electronic rectifier motor can be monitored by simply using an integrated circuit, and the designer can provide corresponding feedback information. Electronically commutated motors also offer softstart with low noise and motor temperatures.
