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Analyze the difference between dc motor/ac motor/electronic rectifier motor

- Jan 08, 2019 -

Engineers usually choose between a DC motor or an AC motor. More recently, electronic rectifier (EC) motors have joined the fray, helping to control energy output and improve energy efficiency. The advanced technology of the equipment is currently replacing the dc motor and ac motor, which can achieve efficiency adjustment. Electronic rectifier motor and dc brushless motor are controlled by external electronic circuit board, which can improve control and efficiency.

Dc motor with the carbon brush and commutator ring to change rotating armature (rotating armature) in the direction of the current and magnetic field electrode, the rotor and stationary permanent magnetic interaction in will lead to the motor rotation according to maxon motor, dc motor is limited by brush system, the service life of 1000-1500 hours, if under the extreme load, the better will be less than 100 hours in the working condition, the operating life of motor parts or will be 15000 hours in addition, the high speed rotation is limited by rectification, usually maximum speed is close to 10000 beats per minute (RPM)The efficiency rate of the dc motor is relatively high, but there are specific losses. The factors leading to the loss efficiency include initial resistance of the windings, brush friction and eddy current losses in AC induction motorsMotors) has adopted a series of winding, and controlled by the ac input voltage, and is produced by the stator magnetic field (stator field), which produce the rotor magnetic field and the synchronous motor, synchronous motor) is another kind of ac motor, its runtime power frequency (frequency) named "supply" of high precision when the current through the slip ring (slip ring) or permanent magnets, will produce a magnetic field of synchronous motor speed is faster than induction motor, which is restricted by the speed of the asynchronous motor (asynchronousSlip-ring ac motor motor) means the equipment running numerical will correspond to a particular point on the performance curve, the curve and peak efficiency of the motor (peak efficiency) will remain consistent if not in accordance with the corresponding numerical point operation, so the efficiency of the motor will plunge in ac motor current is induced in the rotor, thus produce magnetic field, the process would lead to additional energy consumption so the efficiency of the ac motor than the dc motorIn fact, the dc motor is more than 30% more efficient than the ac motor because the permanent magnet produces a secondary magnetic field.

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Above compared the electronic rectifier AC motor, three phase induction motor (three - phase induction AC motor), single-phase AC induction motor and cover pole motor, shaded pole motor) motor efficiency.

Electronic rectifier motor is a brushless dc motor controlled by external electronic devices, which may be electronic circuit board or variable frequency drive. Execution of mechanical rectifier (mechanical commutation) depends on the electronic circuit (electronic circuitry), circuit board can change stationary winding (fixed winding) phase, to ensure that the motor rotation, can provide the right amount of armature current (armature current). Higher accuracy can be achieved if current is transmitted in the correct direction within a precise time period. Synchronous speed is not limited because the electrode speed is controlled by the external electronic devices.

Electronic rectifier motor has the following advantages: because this kind of motor has no brush, it will not produce spark or cause the motor service life to be shortened because of the brush, and it will not waste energy, because it USES electronic devices to control the stator, its performance and controllability is better. Compared with the induction motor, its operating temperature is lower. The smaller the rotor, the more space was saved, and even more when the manufacturer applied the external rotor.

If the use of electronic rectifier motor, power distribution is also cleaner. The brushless dc motor is driven by a separate dc power source. The ac motor power source will generate additional costs and the design is more complex. Electronic rectifier motor can be directly connected to the main ac power supply, but it is not completely dependent on voltage or frequency, small voltage changes will not affect the motor output.

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Electronic rectifier motor is a brushless dc motor controlled by external electronic devices, which may be electronic circuit board or variable frequency drive. Execution of mechanical rectifier (mechanical commutation) depends on the electronic circuit (electronic circuitry), circuit board can change stationary winding (fixed winding) phase, to ensure that the motor rotation, can provide the right amount of armature current (armature current). Higher accuracy can be achieved if current is transmitted in the correct direction within a precise time period. Synchronous speed is not limited because the electrode speed is controlled by the external electronic devices.

Electronic rectifier motor has the following advantages: because this kind of motor has no brush, it will not produce spark or cause the motor service life to be shortened because of the brush, and it will not waste energy, because it USES electronic devices to control the stator, its performance and controllability is better. Compared with the induction motor, its operating temperature is lower. The smaller the rotor, the more space was saved, and even more when the manufacturer applied the external rotor.

If the use of electronic rectifier motor, power distribution is also cleaner. The brushless dc motor is driven by a separate dc power source. The ac motor power source will generate additional costs and the design is more complex. Electronic rectifier motor can be directly connected to the main ac power supply, but it is not completely dependent on voltage or frequency, small voltage changes will not affect the motor output.