JPH065369U - Motor phase position detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To eliminate the need for timing alignment between the motor rotation position and phase, and to reduce the size. [Configuration] The AC motor 1 is rotated by using external power (motor or the like). At this time, since AC motor 1 operates as a generator, an induced voltage is output from each phase of UVW. Then, the interface 20 binarizes the induced voltage of each phase and stores it in the ROM 16 in association with the absolute rotational position. When controlling the drive of the AC motor 1, ROM is used.
The data in 16 is read to detect the position of each phase.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor phase position detection device suitable for use in controlling an energized phase of an AC motor, for example.

[0002]

[Prior art]

 In an AC motor (or brushless DC motor) or the like, it is necessary to detect the phase to be energized in order to control the energization timing of each phase. A phase position detector is used to detect such an energized phase.

FIG. 3 is a side view showing the configuration of an AC motor to which the above-described conventional device is attached. In the figure, 1 is an AC motor, and 2 is a cylindrical multi-pole magnetized medium attached to the shaft 1 of the AC motor. The multi-pole magnetized medium 2 is formed of, for example, a plastic magnet or the like. A large number of magnetic patterns indicating the rotational position are magnetized on the outer circumference of the multi-pole magnetized medium 2, and the passage of this magnetic pattern is detected by the MR element 4 fixed to the casing of the AC motor 1. It is like this. The number of passing magnetic patterns detected by the MR element 4 corresponds to the rotation angle of the AC motor 1.

Next, 6 is a thin disk-shaped magnet attached to the end face of the multi-pole magnetic medium 2, and is magnetized to have 4 to 16 poles. Here, FIG. 4 is a plan view showing a magnetized state when the magnet 6 is magnetized to have four poles. A sensor 8 detects the magnetic field of the magnet 6 and outputs a signal indicating the phase of the AC motor 1. For example, when the AC motor 1 has UVW phases, it outputs a signal indicating the position of each phase. Then, the magnet 6 and the sensor 8 constitute a phase detecting device 9.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional phase detector 9, it is necessary to align the induced voltage waveform of each phase of the AC motor 1 with the position of the UVW phase signal of the phase detector 9. For example, when the U-phase waveform of the phase detector 9 is output as shown in FIG. 5A and the U-phase of the AC motor 1 is output as shown in FIG. It is necessary to match the timing of each waveform as shown by the broken line in the figure. This adjustment was performed by mechanically adjusting the mounting positional relationship between the AC motor 1, the magnet 6 and the sensor 8, for example.

Further, in the above-described conventional phase detection device 9, since the magnet 6 and the sensor 8 are required separately from the multi-pole magnetized medium 2 for knowing the rotation angle of the motor, it is possible to reduce the size. There was a problem that it would be an obstacle.

The present invention has been made in view of the above-mentioned circumstances, and provides a phase position detecting device for a motor that does not require timing alignment with the phase of the motor and can be downsized. Is intended.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides an absolute signal output means for outputting a signal corresponding to the absolute rotation position of a motor, and a non-volatile memory whose address is designated by the output signal of the absolute signal output means. And writing means for binarizing the induced voltage of each phase of the motor and writing these values to the address in the non-volatile memory designated by the absolute signal output means. The signal read from the non-volatile memory is output as a phase signal.

[0009]

[Action]

 When writing to the non-volatile memory, the rotational position of the motor and the induced voltage of the phase are automatically matched. Therefore, by reading the data in the non-volatile memory, the phase signal corresponding to the rotational position of the motor can be obtained.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, the same parts as those shown in FIG. 3 described above are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, reference numerals 10, 11 and 12 denote buffer amplifiers, which respectively amplify the A-phase, B-phase, and Z-phase output signals output from the MR element 4 and supply them to the counter 15. The A phase and the B phase are phases in which one pulse is generated each time the magnetic lattice of the multi-pole magnetized medium 2 passes, but each has a phase difference of 1/4 cycle, and it is in the normal rotation and the reverse rotation. The phase on the leading side and the phase on the lagging side are reversed. The Z phase is a phase showing a predetermined zero point, and becomes the “H” level when the shaft of the AC motor 1 is in a predetermined rotation position.

The counter 15 counts based on the A-phase and B-phase pulses. At this time, the counter 15 detects which of the A-phase and the B-phase is advanced, and switches between up-counting and down-counting according to the detection. Further, the counter 15 is adapted to be reset by the Z phase. When the full count value is the number of pulses corresponding to one rotation, it is not always necessary to reset in the Z phase. Therefore, the output signal (for example, 12-bit output) of the counter 15 indicates the rotational position of the AC motor 1 within one cycle. The above buffers 10, 11, 12 and the counter 15 are backed up by a battery, so that the output signal of the counter 15 always indicates the absolute rotational position of the commutation motor 1.

The output signal of the counter 15 is supplied to the ROM 16 as an address signal. The ROM 16 is composed of a writable nonvolatile storage element, for example, a PROM or an EEPROM, and has 3-bit data terminals Tu, Tv, and Tw.

Next, reference numeral 20 denotes an interface for binarizing the induced voltage of the UVW phase of the AC motor 1 and supplying it to the data terminal of the ROM 16, so as to supply Wc to the ROM 16 with a signal for controlling writing. Has become.

Next, the operation of this embodiment having the above configuration will be described. First, the AC motor 1 is rotated using external power (motor or the like). At this time, since the AC motor 1 operates as a generator, an induced voltage is output from each phase of UVW. Then, the interface 20 binarizes the induced voltage of each phase and supplies it to the data terminal of the ROM 16 and outputs the write control signal Wc.

On the other hand, since the signal corresponding to the absolute rotation position of the AC motor 1 is supplied from the counter 15 to the address terminal of the ROM 16, the ROM 16 is supplied to the ROM 16 for each phase corresponding to the absolute rotation position of the AC motor 1. The state (L or H) of the induced voltage of is written. That is, a map as shown in FIG. 2A is created. Through the above processing, the writing processing to the ROM 16 is completed, and as a result, the correspondence between the absolute position of the AC motor 1 and the position of each phase is stored in the ROM 16.

Next, a case where drive control of the AC motor 1 is performed will be described. First, the data in the ROM 16 at the address corresponding to the absolute rotational position of the AC motor 1 at that time is read out and supplied to a control circuit (not shown) (known AC motor control circuit). The control circuit knows the positions of the U-phase, V-phase, and W-phase from the output signal values of the data terminals Tu, Tv, Tw of the ROM 16, and supplies the drive currents corresponding to these phases to the respective phases of the AC motor 1. Supply. As a result, AC motor 1 starts rotating. Thereafter, in the same manner, the signal indicating the position of each phase corresponding to the rotational position of the AC motor 1 is output from the ROM 16 as shown in FIG. The drive control of the motor 1 is performed.

[0018]

[Effect of device]

 As described above, according to the present invention, it is not necessary to match the timing of the rotation position of the motor with the phase, and the encoder for detecting the rotation angle of the motor can also be used. The size can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing stored contents of a ROM 16 and output signals in the embodiment.

FIG. 3 is a side view showing a schematic configuration of an AC motor incorporating a conventional device.

FIG. 4 is a plan view showing an example of magnetization of a magnet 6.

FIG. 5 is a waveform diagram showing the relationship between the U-phase signal of the conventional device and the U-phase of the motor.

[Explanation of symbols]

2 ... Multi-pole magnetized media (absolute signal output means), 4 ... MR element (absolute signal output means), 15 ... Counter (absolute signal output means), 16 ... ROM (nonvolatile memory), 20 ... ... Interface (writing means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hosokawa ▲ Shin ▼ 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Yamaha Stock Company (72) Inventor Naoyuki Takeuchi 10-1 Nakazawa-machi, Hamamatsu-shi, Shizuoka Yamaha Stock In the company

Claims (1)

[Scope of utility model registration request] 1. An absolute signal output means for outputting a signal corresponding to an absolute rotation position of a motor, a non-volatile memory whose address is designated by an output signal of the absolute signal output means, and an induced voltage of each phase of the motor. And a writing means for writing these values to an address in the non-volatile memory designated by the absolute signal output means, and a signal read from the non-volatile memory for which writing has been completed is a phase signal. Phase position detection device for the motor that outputs as.