Tamagawa Seiki Kabushiki Kaisha

Tamagawa Seiki Co., Ltd.

Sony Corporation

Hiroshi Kushihara

Hirofumi Maruyama

Shinichi Arai

Kazuyuki Ishibashi

Toshiki Muramatsu

Katsutoshi Toyotake

Masayuki Katakura

Yuichi Takagi

Asako Toda

Ryohei Ushikusa

Shinichi Hara

An R/D conversion method includes a step of removing a frequency band including a frequency component that is twice an excitation frequency of excitation signals of a resolver () from a digital angle value (φ). The R/D conversion method further includes a step of outputting, by the resolver (), the resolver signals having a phase difference that corresponds to an angle of the resolver with respect to the excitation signals, respectively, and a step of feeding back the digital angle value (φ) includes feeding back the digital angle value (φ) to the resolver signals.

R/D conversion method and R/D converter

The present invention relates to a magnet wire bonding method and a bonding structure, and more particularly to a new improvement for ultrasonically bonding a longitudinal outer peripheral surface of a magnet wire having no entangling part to a flat surface of a flat part of a terminal pin. A magnet wire bonding method and structure, comprising: using a terminal pin () having a flat plate part () provided in a pin part () as a terminal pin holding part (); placing a magnet wire () in a longitudinally spread state on a flat surface () of the flat plate part () without being entangled; and ultrasonically bonding an outer peripheral surface (E) of the magnet wire () onto the flat surface () with an ultrasonic horn ().

Magnet wire bonding method and bonding structure

The present invention relates to a phase modulation-type redundant two-phase-output resolver, an excitation signal () is applied to an excitation winding () of an annular stator () having a VR-type rotor () disposed therein, and a two-phase output signal () is outputted from first and second output windings () that are provided in the annular stator (), the excitation winding () is made up of first and second excitation windings () of mutually different phases, and the excitation signal () has two phases, and even in a case where a break occurs in only any one winding from among the first and second excitation windings () and the first and second output windings (), at least a one-phase output signal can be obtained.

Phase modulation-type redundant two-phase-output resolver and signal output method thereof

To achieve miniaturization of a resolver apparatus as a system, to obtain the resolver apparatus at a low cost, and to improve failsafe by installing an abnormality detection unit and a self-diagnosis circuit within the R/D converter. According to the present invention, an abnormality detecting method for an R/D converter in a resolver apparatus includes detecting abnormalities of at least the resolver itself (), a cable wiring () through which the resolver () and the R/D converter () are connected to each other, and the R/D converter () itself by an abnormality detection unit () provided in the R/D converter ().

Method of detecting abnormality of R/D converter

A resolver use angle detection IC subjected to a phase lock operation so as to follow not an angle &#x3b8;(t) for detection, but a phase angle &#x3c9;ot&#xb1;&#x3b8;(t) having an offset of a frequency &#x3c9;ot in the phase lock units. For this reason, when the excitation frequency &#x3c9;ot is set sufficiently high with respect to the frequency of the angle &#x3b8;(t), the phase angle &#x3c9;ot&#xb1;&#x3b8; to be followed in the phase lock units will not become zero. For this reason, an angle having a high precision can be found in real time regardless of the configuration not including the conventional apparatus in which the configuration is complex and the power consumption is large like a bipolar VCO and an up/down type counter.

Angle detection apparatus computing phase differences between first and second phase angles

To enhance analog to digital conversion performance by obtaining a digital angle output using a negative feedback system including a resolver within a closed loop. The present invention provides a method of converting an analog signal into a digital signal, including inputting a two-phase sinusoidal signal an R/D conversion portion and converting an input rotational angle (&#x3b8;) into a digital angle output (&#x3a6;), in which the method includes obtaining the digital angle output (&#x3a6;) using a negative feedback control system including the resolver within a closed loop.

Method of converting an analog signal into a digital signal

A sensor system for controlling a motor in a motor drive control system having a drive control circuit ( ) that controls the driving of a motor ( ) in accordance with an operation command, includes a main angle detecting unit ( ) having a resolver ( ) that detects the rotation angle of the motor ( ) and a sub angle detecting unit ( ) that estimates the rotation angle of the motor ( ) on the basis of the counter electromotive power of the motor ( ). The main angle detecting unit ( ) detects the rotation angle of the motor ( ) in a normal state, and the sub angle detecting unit ( ) detects the rotation angle of the motor ( ) when the main angle detecting unit ( ) is in failure.

Sensor system for controlling a motor

In a calculation processing device of a resolver signal, a processing speed of the resolver signal is increased, and a noise-proof characteristic thereof and also reliability thereof are improved, while total system cost is reduced. The resolver signal calculation processing device is arranged such that a resolver signal output from a resolver is digitally converted by a resolver interface into a digital rotary angle signal; the digitally-converted rotary angle signal is processed by a central calculation processing unit; and the resolver interface is provided within the resolver signal calculation processing device.

Calculation processing device of resolver signal

The present invention provides an automatic resolution changing method and circuit for use in a high-precision digital conversion of two-phase sinusoidal wave signals. The angular velocity (d&phgr;/dt) of the rotor obtained from the difference between these two-phase sinusoidal wave signals is integrated by a counter. Subsequently, digital conversion of the rotation angle (&thgr;) of the rotor with respect to the stator is performed, and a result of the digital conversion is outputted. At this time, in the case where the angular velocity (d&phgr;/dt) is equal to or higher than a first percentage of the follow-up speed at the current resolution of the counter, the resolution of the counter is reduced. Further, in the case where the angular velocity (d&phgr;/dt) is equal to or lower than a second percentage of the follow-up speed at the current resolution of the counter, the resolution of the counter is increased.

Automatic resolution changing method and circuit for use in digital conversion of two-phase sinusoidal wave signals

It is an object of this invention to provide a digital conversion method for an analog signal in which, when sin(&thgr;&minus;&phgr;) is calculated as a error deviation &egr;, a first output signal sin(&thgr;&minus;&phgr;)&middot;f(t) of the previous stage of the error deviation &egr; is converted into a digital signal by positive/negative sign determination performed by a comparator to make almost circuits into digital circuits, thereby making it easy to form an IC. In the digital conversion method for an analog signal according to the invention, sin(&thgr;&minus;&phgr;)&middot;f(t) obtained by guiding the rotation detection signal to a multiplier and operating the rotation detection signal is converted into a digital signal by positive/negative sign determination performed by a comparator to achieve a stable and inexpensive configuration.

Method of converting an analog signal to digital signal by digitalizing error deviation

In a conventional digital angle conversion method, constituent parts partially have an analog arrangement, the entire arrangement is not easily made as a monolithic semiconductor, and a low price, a light weight, and high reliability cannot be easily obtained. In addition, high-speed tracking is limited. A digital angle conversion method according to the present invention is a method in which a rotating signal is introduced into a sin.multidot.cos multiplier (2) to obtain a first output signal sin(.theta.-.phi.).multidot.f(t), the first output signal sin(.theta.-.phi.).multidot.f(t) is synchronously rectified to remove an exciting component f(t) so as to obtain a second output signal sin(.theta.-.phi.), a digital angle output (.phi.) is obtained by a voltage control oscillator (5) and a one-turn counter (6), and the arrangement of respective sections can be made as a monolithic semiconductor.

Digital angle conversion method

A digital angle detecting method adapted to obtain a stable digital angle output, which is little affected by cable length, uses a resolver of the amplitude modulation type. The respective phases of two-phase resolver signals are first shifted, and are then added to the original two-phase synthetic signals. Subsequently, another signal is synthesized by multiplying the two synthetic signals by two-phase sine-wave signals. Finally, an angle output and an angular velocity output is obtained by using the synthesized signal.

Digital angle detecting method

The present invention relates to a digital angle detection system, or more particularly, to provide a digital angle output that is stable and the least affected by a cable length or the like. A digital angle detection system of the present invention uses a phase signal [sin(.omega. t-90.degree.-.theta.)] produced by synthesizing a phase-shifted resolver signal cos.theta..multidot.sin(.omega. t-90.degree.), which is 90.degree. out of phase with one resolver signal cos.theta..multidot.sin.omega. t, with the other resolver signal sin.theta..multidot.sin.omega. t.

Growing community of inventors

Nagano-ken, Japan

Hiroshi Kushihara