JP3097154B2 - Phase detector for rotating electric machines - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phase detector for a rotating electric machine for detecting the phase of a rotating electric machine mounted on a turbocharger. 2. Description of the Related Art In recent years, turbochargers for recovering the exhaust energy of an engine to increase the intake pressure of the engine have been widely used, and a rotating electric machine serving as an electric-generator is mounted on a rotating shaft of the turbocharger. According to the operating state of the engine, the supercharging pressure is increased by electric driving, or the electric power is activated to charge the battery with the electric power. [0003] In such a rotating electric machine, since its rotation speed is as high as several hundred thousand rotations per minute, sufficient control can be performed unless the phase of the rotor corresponding to the stator is carefully checked during electric driving. Will not be. For this reason, a turbocharger with a rotating electric machine has been proposed in which a magnetic thin film protected by a ceramic plate is fixed to the back of a compressor blade of a turbocharger, and a magnetic sensor for detecting a magnetic change due to the rotation is provided. 63-302132. [0005] And, the magnetic sensor as described above is usually
The magnetic change due to the rotation of the magnetic body is detected by the electromagnetic induction action of the coil attached to the rotating electric machine body, the signal of the voltage change due to the detection is guided to a controller or the like, and the signal is pulsed through a comparator circuit at the input stage. The phase is detected by the pulse signal. In a detection apparatus using this kind of pulse signal, for example, if the polarity of the signal from the above-mentioned coil is erroneously reversed and introduced into the comparator circuit, the phase of the generated pulse is changed. However, there is a drawback that a shift occurs due to the level of the turbine speed. FIGS. 4 and 5 are diagrams for explaining a phase shift occurring in accordance with the polarity of the signal polarity. The coil for detecting a magnetic change detects a change in a magnetic field and shows + and-in FIG. 4 (A). A regular output corresponding to the positive waveform is obtained from the comparator circuit, but if the pulse waveform is reversed, the comparator circuit will respond to the positive waveform delayed by half a cycle. 4 (B) is generated. When the output waveform of the operation of the comparator circuit is compared between when the rotating electric machine is rotating at a high speed and when it is rotating at a low speed, the pulse waveform from the magnetic sensor (position sensor) as shown in FIG. In the case of the characteristic, although the pulse width of the comparator output at the time of high-speed and low-speed rotation is different from each other, the rise is the same and there is no phase shift.On the other hand, if the pulse waveform from the coil is reversed, In the case of a low speed, there is a problem that the rise is greatly shifted and the speed is delayed, and a phase shift occurs as shown in the figure, so that sufficient control of the rotating electric machine cannot be performed. In order to prevent such a phase shift, it is necessary to confirm the signal polarity when connecting the magnetic sensor of the rotating electric machine to the controller having the comparator circuit. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a phase detection device for a rotating electrical machine that can prevent the occurrence of a phase shift even if such a step of checking the polarity is omitted. According to the present invention, there is provided an electromagnetic detecting means for detecting a phase based on the rotation of a rotor of a rotating electric machine arranged on a rotating shaft of a turbocharger. A rectifying means for full-wave rectifying a signal from the detecting means, and a phase detecting means for generating a pulse signal corresponding to the output from the rectifying means, shaping the signal, and detecting the rise of the pulse signal. And a phase detection device for a rotating electric machine provided with the means. Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a phase detecting device for a rotating electric machine according to the present invention, and FIG. 2 is a waveform diagram showing the operation thereof. In the drawings, reference numeral 1 denotes a rotating electric machine (T
CG), which is disposed on a rotating shaft of a turbocharger having a turbine driven at high speed by the exhaust energy of an engine (not shown) and a compressor provided on the turbine shaft. It assists the supply operation or recovers the exhaust energy as electric power by the power generation operation. Reference numeral 2 denotes a phase detector of the controller, which is a full-wave rectifier circuit 21 for inputting a signal from a position sensor serving as electromagnetic detection means of the rotating electric machine 1 to perform full-wave rectification. A rectifying signal, and outputs a pulse; a pulse generating / shaping circuit 23 for shaping the pulse; a phase correcting circuit 24 for detecting a rising edge of the shaped pulse; and the like. The detection signal is configured to be guided to a power control unit of the controller. Next, the operation of the embodiment constructed as described above will be described with reference to FIG. 2. Positive and negative signals from the position sensor of the rotating electric machine 1 are first rectified by the full-wave rectifier circuit 21 and are shown in FIG. Is converted into a bimodal waveform in the + direction as shown in FIG. Next, a pulse corresponding to the waveform signal is output by the comparator 22, and the pulse generation / shaping circuit 23 shapes the signal into a wide signal corresponding to the output signal, and sends the signal to the phase correction circuit 24. The phase correction circuit, which has received the shaped signal, detects the rise of this signal and inputs a phase signal at a timing corresponding to the rise to the power control unit of the controller, so that the rotor of the rotary electric machine 1 Can be accurately determined. FIG. 3 is a sectional view showing an example of a turbocharger to which such an embodiment is applied. A turbocharger 10 has a rotary electric machine 1 on a turbine shaft 11 thereof, and a compressor blade of the turbocharger 10. 1
A point-shaped magnetic body 13 is embedded in the back surface of the scroll 2, and a coil 15 serving as a position sensor is attached to the scroll 14. In the turbocharger with the rotating electric machine configured as described above, the detection signal from the coil 15 generated in accordance with the rotation of the rotating electric machine 1, that is, the rotation of the compressor blade 12, is introduced into the phase detecting section of the present embodiment. By doing so, the phase of the rotor can be correctly detected regardless of whether the polarity of the detection signal is positive or negative, as described above. Although the present embodiment has been described for detecting the phase of a rotating electric machine attached to a turbocharger, the present invention can be applied to the phase detection of a rotor of a general rotating electric mechanism. Various modifications within the scope of the application or the gist of the present invention are not excluded from the scope of the present invention. As described above, according to the present invention, after the signal from the position sensor of the rotating electric machine is rectified by the full-wave rectifier circuit, the rectified signal is transmitted through the comparator and the pulse generation and shaping circuit.
Since the rising is detected by the phase correction circuit and the phase is obtained, even if the signal from the position sensor has the opposite polarity, if full-wave rectification is performed, the same signal as in the case of the positive polarity will be obtained. In connection between the electric machine and the controller, it is possible to save the trouble of confirming the polarity of the signal line and to simplify the wiring operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an embodiment of a phase detection device for a rotating electric machine according to the present invention. FIG. 2 is a waveform chart showing the operation of the present embodiment. FIG. 3 is a cross-sectional view of a turbocharger to which the embodiment is applied. FIG. 4 is an explanatory diagram of a phase shift occurring according to the positive or negative of the signal polarity. FIG. 5 is an explanatory diagram of a phase shift generated according to the positive or negative of the signal polarity. [Description of Signs] 1 ... rotating electric machine 2 ... phase detector 21 ... full-wave rectifier circuit 22 ... comparator 23 ... pulse generation / shaping circuit 24 ... phase correction circuit

Claims (1)

(57) [Claim] A phase detection device for a rotating electrical machine that detects a phase based on rotation of a rotor of a rotating electrical machine disposed on a rotating shaft of a turbocharger by an electromagnetic detecting means, wherein a signal from the detecting means is provided. Rectifying means for performing full-wave rectification, and phase detecting means for generating and shaping a pulse signal corresponding to the output from the rectifying means and detecting the rise thereof.