電氣外文翻譯---基于dsp高速無(wú)刷直流電機(jī)控制使用直流環(huán)節(jié)電壓控制-電氣類-閱讀頁(yè)
2025-06-05 20:23本頁(yè)面
【正文】 regulating the DC link input voltage of the inverter through the chopper. By using this technique,since the voltage control and mutation can be achieved independentl y, a mutating delay does not exist even in a high speed region. Also, the phase current can have a waveform similar to the rectangular wave and the terminal voltage is more e cient to deal with in the position detection circuits. The practical implementation issues concerning the mutation delay in a high speed sensorless control are discussed. The whole control system is implemented on a BLDC motor using DSP TMS320C240 and the e?ectiveness is veried through the parative simulations and experiments. 2 Keywords brushless DC motor, sensorless control, DSP control 1. Introduction In many industrial elds, the installation of a shaft sensor may signi cantly increase the drive cost as well as plicate the motor configuration [1]. In particular, for a motor built in a pletely sealed pressor, a shaft sensor is difficult to apply due to the degradation of the sensor reliability in high temperature and the need for extra lead wires. Furthermore, these sensors, particularly Hall sensors, are temperature sensitive, limiting the operation of the motor to below about 75176。 and the motor voltage for the speed control is regulated by using a stepdown chopper acting as a buck converter. However, some advantages of the DClink voltage control scheme over the conventional 2phase PWM scheme in the high speed sensorless control have not been addressed. This article presents a DSPbased high speed sensorless control for a BLDC mo tor 3 using a DC link voltage control scheme. By driving the BLDC motor at high speed, the overall drive system can have a small size and a light weight at the same power rating. To control the BLDC motor at high speed without a shaft sensor, a DSPbased controller is developed using TMS320C240. Using the DC link voltage control scheme, the inverter is operated with the squarewave of 120176。 . The stator currents are supplied by the 2phase excitation scheme where only two of the three phases are excited at any instant of time and one phase is conducted during 120176。 degrees. Thus, this detection scheme is employed in this paper. The speed information can be obtained from the derivative of the detected position signals. Since the mutation signals are fed into a DSP every 60176。 degrees of active interval and is held in on state during the second 60176。 sec. Even though this mutation delay can be neglected for a medium speed range, it has significant in uences on the phase current response and drive performance at high speed since the 60degree interval that the mutation arises in is relatively small. For example, when a 2pole motor is rotating at 50,000 rpm, 60degree interval bees 200 interval. Thus, the ongoing and offgoing phase PWM schemes with the method in Figure 1(c) can be a preferred way for a high speed sensorless control. Nevertheless, there is still a problem. At high speed, only a few PWM pulses can be used for the speed control during a 60176。interval of a 2pole motor bees 200 is only , which results in an unequal number of PWM pulses 3 or 4 during a 6017
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