Motor rotor position measuring method with compensation capability and device employing same
A technology of motor rotor and compensation ability, applied in the direction of electronic commutator, etc., can solve the problems of time-consuming and laborious, very high precision machining code wheel teeth, inconsistent delay, etc., to reduce production costs, make up for response time and hysteresis problems. Effect
Active Publication Date: 2013-06-26
SHAANXI AVIATION ELECTRICAL
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Problems solved by technology
However, when the Hall position sensor is measured at a high speed, due to the influence of the response time and the hysteresis effect, the delay of the rising and falling edges at different speeds is inconsistent, resulting in an asymmetrical output signal, and the duty cycle is often less than 45% or greater than 55%. The use of quadrature encoding circuit is easy to cause large errors. Although proper compensation can be made by adjusting the motor code disc, it is only suitable for fixed-speed motors. For variable-speed motors, multiple measurement compensations are required, which is time-consuming and laborious, and the effect is not good.
In addition, in order to ensure the measurement accuracy, the requirements for the accuracy of the processed code disc teeth are very high, which is difficult for general equipment to meet.
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[0033] The present invention will now be further described in conjunction with the embodiments and drawings:
[0034] In this embodiment, a steel code disc is adopted, which is an equally spaced 8-tooth disc with an angle of 22.5° per tooth. The setting of 6 position sensors is as follows Figure 4 ,: The angle between the first position sensor 1, the second position sensor 2 and the third position sensor 3 is 120°; the angle between the fourth position sensor 4 and the first position sensor 1 is 67.5°, the fifth position sensor 5 and The angle between the second position sensor 2 is 67.5°, and the angle between the sixth position sensor 6 and the third position sensor 3 is 67.5°.
[0035] See the implementation device of this method Figure 5 , Implemented by a logic gate circuit, the connection relationship is: the angle between the first position sensor 1, the second position sensor 2 and the third position sensor 3 is 120°; the angle between the fourth position sensor 4 and the...
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The invention relates to a motor rotor position measuring method with a compensation capability and a device employing the same. The motor rotor position measuring method is technically characterized in that three Hall sensors are added at a certain angle on a code disc combined by a traditional code disc and three sensors; and motor position signals are sampled, the ascending edges of original output signals serve as the ascending edges of finial output signals, the ascending edges of the added Hall sensors are changed into the descending edges of the final output signals, and the ascending edges not changing together with the rotational speed variation are adopted to measure the motor rotor position. Therefore, the position measuring compensation is realized and the measuring precision is not affected by the rotational speed variation.
Description
Technical field [0001] The invention relates to a method and a device for measuring the position of a motor rotor with compensation capability, belonging to the motor and electrical control technology, and relates to the motor position detection technology. Background technique [0002] With the expansion of the application field of high-speed motors, the means for high-precision detection of the rotor position of the motor must be improved to meet the needs of the application. For motors such as switched reluctance motors and permanent magnet synchronous motors, the rotor position signal is the main control basis, and requires high-precision motor rotor position. Therefore, the accuracy and response speed of the detection device signal are very high. Currently limited by the technology of the position sensor device, the response time is slow and asymmetric, which is the most important factor affecting the measurement accuracy. [0003] The position sensors currently used are all ...
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IPC IPC(8): H02P6/16
Inventor 赵建新来帅雷吴东华
Owner SHAANXI AVIATION ELECTRICAL