CN103501137A - Rapid and high-precision location information acquiring system for permanent magnet synchronous motor - Google Patents
Rapid and high-precision location information acquiring system for permanent magnet synchronous motor Download PDFInfo
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- CN103501137A CN103501137A CN201310469767.4A CN201310469767A CN103501137A CN 103501137 A CN103501137 A CN 103501137A CN 201310469767 A CN201310469767 A CN 201310469767A CN 103501137 A CN103501137 A CN 103501137A
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Abstract
The invention discloses a rapid and high-precision location information acquiring system for a permanent magnet synchronous motor. The system adopts a 23bit high-precision absolute type grating encoder as an angle sensor, adopts the EnDat 2.2 protocol for data transmission, and generates two paths of signals, namely DATA+ and DATA- signal and CLK+ and CLK- signal. The CLK signal is transmitted to a code disk through a high-speed RS 485 interface chip in a unidirectional mode, the absolute type grating encoder is electrified to obtain the location signal DATA, and the DATA signal is transmitted to a DSP (digital signal processor) for data resolving under the control of CPLD (complex programmable logic device) time sequence logic. The rapid and high-precision location information acquiring system for the permanent magnet synchronous motor has the advantages that a pure digital interface is adopted, a complex signal acquisition circuit is avoided, the circuit structure is simple, and a location signal can be obtained immediately after the system is powered up.
Description
Technical field:
The present invention relates to the permagnetic synchronous motor servo control technique, be specifically related to a kind of quick high accuracy permagnetic synchronous motor positional information and obtain system, it is applied to three rings of servo-control system and controls.
Background technology:
The position transducer of permagnetic synchronous motor has resolver, inductosyn and grating encoder.The advantage of resolver is that reliability is high, and operational environment is not had to what requirement, insensitive to vibrating, and shortcoming is that precision is not high, generally only has 2 '-5 '.The progression of inductosyn is more than multipolar resolver, thereby precision is higher, and the precision of the round induction synchrometer that for example diameter is 300mm can reach ± and 1 "; resolving power 0.05 ", repeatability 0.1 ", its shortcoming is its angular displacement measuring circuit more complicated, certainty of measurement can be subject to the impact of signal processing circuit.Grating encoder is current most widely used position transducer, is that three kinds of angular transducer intermediate-resolutions are the highest.In addition, its data processing circuit is simple, and accuracy of detection is high.Grating encoder is divided into again increment type grating encoder and absolute grating encoder.Patent 201120012672.6 has just proposed the position detecting circuit based on the increment type grating encoder, yet incremental encoder can only be measured the increment of corner, position detecting system based on the absolute grating encoder in this paper, circuit is simple, after energising, can directly obtain positional information.
Summary of the invention:
The positional information that the purpose of this invention is to provide a kind of quick high accuracy is obtained system, solves the position probing problem of absolute grating encoder.
As shown in Figure 1, system of the present invention adopts 23bit high accuracy absolute grating encoder as angular transducer, carry out transfer of data by the EnDat2.2 agreement, system has two paths of differential signals: DATA+, DATA-signal and CLK+, CLK-signal, wherein by High-Speed RS 485 interface chip one-way transmissions, to the code-disc in the absolute grating encoder, the DATA that obtains position signalling after absolute grating encoder energising sends DSP under the CPLD sequential logic is controlled to carry out data solver and obtains the motor position value CLK signal.
The present invention is than other location information acquisition methods, and its advantage is:
1 has avoided complicated signal acquisition circuit, the totally digital circuit interface, and circuit structure is simple;
2 adopt the absolute grating encoder, after energising, can obtain immediately positional information, without the initial position of finding rotor.
The accompanying drawing explanation:
The system principle diagram that Fig. 1 is position acquisition.
Embodiment:
Referring to Fig. 1, obtain system according to the positional information described in specification, adopt the ECN425 absolute grating encoder of HEIDENDHAIN company as angular transducer, MAX491 is as the RS485 interface chip of encoder, CPLD adopts the EPM7128S of ALTERA company, and DSP adopts the TMS320F2812 of TI company.System clock is 1MHz, after two clock pulse, EPM7128S passes through the instruction of MAX491 sending mode to encoder, after encoder successfully calculates motor absolute position value, under the EPM7128S sequential logic is controlled, from start bit (S), start to send position signalling to DSP TMS320F2812 by MAX491, DSP carries out data solver and obtains the motor position value.
Claims (1)
1. a quick high accuracy permagnetic synchronous motor positional information is obtained system, and it comprises grating encoder, High-Speed RS 485 interface chips, CPLD and DSP, it is characterized in that:
System adopts 23bit high accuracy absolute grating encoder as angular transducer, carry out transfer of data by the EnDat2.2 agreement, system has two paths of differential signals: DATA+, DATA-signal and CLK+, CLK-signal, wherein by High-Speed RS 485 interface chip one-way transmissions, to the code-disc in the absolute grating encoder, the DATA that obtains position signalling after absolute grating encoder energising sends DSP under the CPLD sequential logic is controlled to carry out data solver and obtains the motor position value CLK signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310469767.4A CN103501137A (en) | 2013-10-10 | 2013-10-10 | Rapid and high-precision location information acquiring system for permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310469767.4A CN103501137A (en) | 2013-10-10 | 2013-10-10 | Rapid and high-precision location information acquiring system for permanent magnet synchronous motor |
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| CN103501137A true CN103501137A (en) | 2014-01-08 |
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| CN201310469767.4A Pending CN103501137A (en) | 2013-10-10 | 2013-10-10 | Rapid and high-precision location information acquiring system for permanent magnet synchronous motor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425733A (en) * | 2015-12-21 | 2016-03-23 | 上海铼钠克数控科技股份有限公司 | Method for communications between numerical control machine tool and absolute grating ruler and drive |
| CN105549477A (en) * | 2015-12-25 | 2016-05-04 | 南京冠腾自动化科技有限公司 | Data reading apparatus of servo driver |
| CN106092073A (en) * | 2016-06-02 | 2016-11-09 | 清华大学 | Micromechanical gyro north finder |
| CN111006697A (en) * | 2019-10-25 | 2020-04-14 | 珠海格力电器股份有限公司 | Position data processing and transmission control system, method and application of encoder |
| CN114527691A (en) * | 2022-01-20 | 2022-05-24 | 湖南力行动力科技有限公司 | Method for realizing absolute encoder decoding system |
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| CN103163825A (en) * | 2011-12-09 | 2013-06-19 | 中国科学院沈阳计算技术研究所有限公司 | Four-channel numerical control system ENDAT2.2 interface |
| CN203537286U (en) * | 2013-10-10 | 2014-04-09 | 中国科学院上海技术物理研究所 | High-precision system for quickly obtaining location information of permanent magnet synchronous motor |
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2013
- 2013-10-10 CN CN201310469767.4A patent/CN103501137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103163825A (en) * | 2011-12-09 | 2013-06-19 | 中国科学院沈阳计算技术研究所有限公司 | Four-channel numerical control system ENDAT2.2 interface |
| CN203537286U (en) * | 2013-10-10 | 2014-04-09 | 中国科学院上海技术物理研究所 | High-precision system for quickly obtaining location information of permanent magnet synchronous motor |
Non-Patent Citations (1)
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| 潘鑫等: ""高性能伺服系统编码器解码系统设计与实现"", 《微电机》, vol. 45, no. 12, 31 December 2012 (2012-12-31), pages 21 - 25 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425733A (en) * | 2015-12-21 | 2016-03-23 | 上海铼钠克数控科技股份有限公司 | Method for communications between numerical control machine tool and absolute grating ruler and drive |
| CN105425733B (en) * | 2015-12-21 | 2019-03-12 | 上海铼钠克数控科技股份有限公司 | The means of communication between numerically-controlled machine tool and absolute grating scale and driver |
| CN105549477A (en) * | 2015-12-25 | 2016-05-04 | 南京冠腾自动化科技有限公司 | Data reading apparatus of servo driver |
| CN106092073A (en) * | 2016-06-02 | 2016-11-09 | 清华大学 | Micromechanical gyro north finder |
| CN106092073B (en) * | 2016-06-02 | 2019-05-07 | 清华大学 | Micromechanical gyro north finder |
| CN111006697A (en) * | 2019-10-25 | 2020-04-14 | 珠海格力电器股份有限公司 | Position data processing and transmission control system, method and application of encoder |
| CN111006697B (en) * | 2019-10-25 | 2020-11-24 | 珠海格力电器股份有限公司 | Position data processing and transmission control system, method and application of encoder |
| CN114527691A (en) * | 2022-01-20 | 2022-05-24 | 湖南力行动力科技有限公司 | Method for realizing absolute encoder decoding system |
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Application publication date: 20140108 |