(Haibo Technology) characteristics of Brushless DC motor
In 1831, Faraday discovered the phenomenon of electromagnetic induction, laid the theoretical foundation of modern motor. From 1840s the first successful development of DC motor, after about 17 years, DC motor technology is mature. With the expansion of application fields, the DC motor requirements are increasingly high, mechanical reversing device contact limiting the application of Brushless DC motor in many occasions in the. In order to replace the mechanical brush contact device - brushless DC motor commutator structure, people made long-term exploration. In 1915, American Langnall invented with mercury arc rectifier control gate, inverter DC to AC converter made by. In the 1930s, proposed by ion device to realize the stator winding of the motor rotor position according to the change of the so-called commutator motor, but this kind of motor due to poor reliability and low efficiency, the whole device is bulky and complex and no practical value.
The rapid development of science and technology, has brought the power semiconductor technology leap. The successful development of the switch transistor, to create a new type of DC motor, brushless DC motor has brought vitality. In 1955, American Harrison first proposed to use the transistor commutation circuit replaces motor brush contact. This is the prototype of Brushless DC motor. It consists of a power amplification part, a signal detection part, a magnetic pole body and a transistor switch circuit composition and its working principle is when the rotor rotates, in signal winding induction electromotive force signal cycle. The signal electric potential respectively so that the transistor conduction in turn phase change can be realized.
The brushless DC motor in accordance with the work characteristics, can be divided into two categories:
Brushless DC motor has 1 DC motor characteristics
The back EMF waveform and the current waveform of power supply is the motor of the rectangular wave, called rectangular wave synchronous motor, and brushless DC motor. This type of motor is composed of DC power supply, to detect the main rotor position by position sensor, the signal detected by the electronic transfer to trigger the corresponding phase line to achieve contactless commutation. Obviously, the brushless DC motor has a variety of operating characteristics of Brushless DC motor.
Brushless DC motor AC motor has 2 characteristics
Counter electromotive force waveform and power supply current waveform is a sine wave of the motor, known as the sine wave synchronous motor. This type of motor is also supplied by DC power supply, but through the inverter DC power into AC, and then to drive the general synchronous motor. Therefore, they have various operating characteristics of synchronous motor.
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