Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
1999-02-24
2001-09-04
Williams, Hezron (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S166000, C324S165000, C318S567000
Reexamination Certificate
active
06285184
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a speed/position signal generator for outputting pulse signals of A and B, and Z phases corresponding to a frequency set value and a teeth number set value. “Teeth number” means the number of generated pulses per one rotation of a rotary encoder.
In brief, this generator electronically emulates the prior mechanical-type to phase incremental rotary encoder (two phase PG—that is, pulse generator) involving Z phase, which means that said generator statistically generates a signal corresponding to a rotation pulse of an electric motor.
2. Prior Art
When the rotation speeds of a plurality of electric motors are controlled, it is conventionally performed by controlling a deviation between a revolution speed of one electric motor (hereinafter referred to as a parent motor) among the plurality of electric motors and that of another electric motor (hereinafter referred to as a child motor) taking the revolution speed of the parent motor as a reference.
However, in such a construction there is a displacement of a mechanical rotary shaft of the parent motor, and a reference value produced owing to the error is transmitted to the child motor as it is. Further, any delay of signal transmission between the parent motor and the child motor makes highly accurate synchronization control difficult. This is undesirable for situations where a plurality of electric motors are operated.
In view of the difficulties with the prior art, it is an object of the present invention to provide a speed and position signal generator without any delay of signal transmission irrespective of mechanical error.
SUMMARY OF THE INVENTION
To achieve the aforementioned object, there is provided a speed and position signal generator for generating A and B phase pulse signals corresponding to the frequency set value and a direction set value, and further outputting these two phase pulse signals and a Z phase pulse signal corresponding to the teeth number set value, wherein it comprises a reference clock generator, a frequency arithmetic operation circuit, a frequency division circuit for dividing the frequency of a pulse train output from the frequency arithmetic operation circuit, an A and B phase generation circuit for generating A and B phase pulse signals from the divided frequency pulse signal, and a Z phase generation circuit for generating a Z phase pulse signal from the A and B phase pulse signals and teeth number set value.
The speed and position signal generator is characterized in that the reference clock signal is inputted into said frequency arithmetic operation circuit and further the output frequency set value is inputted, and further the pulse train output from the frequency arithmetic operation circuit corresponding to the output frequency set value is inputted into the frequency division circuit and frequency division pulse signal generated by the frequency division circuit is inputted into the A and B phase generation circuit, and in that the frequency division pulse signal is assumed to be the A phase pulse signal and a pulse train at the same frequency having a phase difference with respect to the A phase pulse signal is generated as the B phase pulse signal which is outputted together with the A phase pulse signal, and further in that these A and B phase pulse signals are inputted into the Z phase generation circuit where a pulse signal is generated for each reference position of the A and B phase pulse signals using the teeth number of set value.
REFERENCES:
patent: 02016830 (1990-01-01), None
patent: 03273316 (1991-04-01), None
patent: 03157013 (1991-07-01), None
patent: 05227776 (1993-09-01), None
patent: 10114058 (1998-06-01), None
patent: 10281809 (1998-10-01), None
USPTO Translation 2001-479; Translation into English of Japanese Published Unexamined (Kokai) Patent Application No. H3-273316, published Dec. 4, 1991. Inventors: Suzuki et al., Undated.
Andersen Henry A.
Bierman, Muserlian and Lucas
Kabushiki Kaisya Tokyo Kakai
Williams Hezron
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