A balance wheel weight parameter measurement system and method

Abstract

The present invention provides a balance wheel weight parameter measurement system and method, belonging to the technical field of balance wheel detection. It includes: a rotational speed photoelectric sensor, a disk pin rotational speed signal level converter, a weight measurement sensor, an instrumentation amplifier, a signal filtering and conditioning circuit, a zero-crossing comparator, an analog-to-digital converter, and a microprocessor. A weight signal and a weight zero-crossing signal are obtained through the balance wheel vibration signal; a disk pin signal is obtained through the plane reflected light signal of the balance wheel disk pin; the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit is obtained; the phase shift angle is calculated using the phase-frequency compensation characteristic equation; the balance wheel weight angle is obtained using the disk pin signal, the weight zero-crossing signal, and the phase shift angle; the balance wheel weight is calculated using the weight signal of the balance wheel. The present invention has a large tolerance for input signals, solves the problem that the input signal of the conditioning circuit in the prior art has clutter interference and cannot work properly, and can quickly calculate the balance wheel weight angle and weight.

Description

Technical Field

[0001] The present invention belongs to the technical field of balance wheel detection, and particularly relates to a balance wheel unbalance parameter measurement system and method. Background Art

[0002] Among the balance wheel parameters, in addition to the parameters of the shape size and material, the two parameters of the unbalance weight and the unbalance angle of the balance wheel are very important in the production process of the balance wheel. The static balance process of the balance wheel is carried out according to the measurement of these two parameters.

[0003] In terms of balance wheel detection, there is currently no device that can quickly and automatically compensate for the circuit phase shift and has a high enough accuracy to meet the production requirements. What can be seen, for example, is a resistance-capacitance phase-shifting circuit composed of variable resistors or capacitors. By adjusting the size of the resistor or capacitor, the compensated phase value is adjusted. It is only suitable for occasions with a fixed frequency, and the accuracy and stability are not high. Another example is to use voltage-controlled technology and an all-pass filter circuit, but this circuit is complex in composition and not easy to debug, and the response is slow. It takes time accumulation to gradually eliminate errors and cannot quickly follow the change of the input signal. Another example is to use a relatively large computer system. After sampling the input signal, specific software is used for arithmetic processing. Another example is to use a non-phase-shifting LC filter composed of pure inductors and capacitors. However, when applied to lower frequencies, the inductors and capacitors formed are large in volume and difficult to calibrate, which is very limited in miniaturized applications. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a balance wheel unbalance parameter measurement system and method.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A balance wheel unbalance parameter measurement system, comprising:

[0007] A rotational speed optoelectronic sensor, configured to obtain an optical signal reflected by the plane of the balance wheel disk pins;

[0008] An unbalance measurement sensor, configured to obtain a vibration signal when the balance wheel rotates;

[0009] A microprocessor, electrically connected to the disk pin rotational speed signal level converter, the zero-crossing comparator, and the analog-to-digital converter, configured to obtain the unbalance signal and the unbalance zero-crossing signal of the balance wheel through the vibration signal when the balance wheel rotates, obtain the disk pin signal of the balance wheel through the optical signal reflected by the plane of the balance wheel disk pins, obtain the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit, calculate the phase shift angle using the phase-frequency compensation characteristic equation, obtain the balance wheel unbalance angle using the disk pin signal, the unbalance zero-crossing signal, and the phase shift angle, and calculate and obtain the measured unbalance weight of the balance wheel using the unbalance signal of the balance wheel.

[0010] Preferably, it further includes:

[0011] A disc nail rotation speed signal level converter, electrically connected to the rotation speed optoelectronic sensor; the disc nail rotation speed signal level converter is used to convert the optical signal reflected by the plane of the balance wheel disc nail into a pulse signal;

[0012] An instrumentation amplifier, electrically connected to the unbalance measurement sensor; the instrumentation amplifier is used to amplify the vibration signal;

[0013] A signal filtering and conditioning circuit, electrically connected to the instrumentation amplifier; the signal filtering and conditioning circuit is used to filter the vibration signal to form a band-pass signal; the signal filtering and conditioning circuit includes: a 42 Hz low-pass filter, electrically connected to the instrumentation amplifier; the 42 Hz low-pass filter is used to filter the vibration signal to form a low-pass signal; a 40 Hz band-pass filter, electrically connected to the 42 Hz low-pass filter; the 40 Hz band-pass filter is used to filter the low-pass signal to form a band-pass signal;

[0014] A zero-crossing comparator, electrically connected to the signal filtering and conditioning circuit; the zero-crossing comparator is used to convert the band-pass signal into a square wave signal;

[0015] An analog-to-digital converter, electrically connected to the signal filtering and conditioning circuit; the analog-to-digital converter is used to sample the band-pass signal to form a digital signal; and is electrically connected to the signal filtering and conditioning circuit.

[0016] A method for measuring the unbalance parameter of a balance wheel, including the following steps:

[0017] Obtain the optical signal reflected by the plane of the balance wheel disc nail;

[0018] Obtain the vibration signal when the balance wheel rotates;

[0019] Obtain the unbalance signal and the unbalance zero-crossing signal of the balance wheel through the vibration signal when the balance wheel rotates;

[0020] Obtain the disc nail signal of the balance wheel through the optical signal reflected by the plane of the balance wheel disc nail;

[0021] Obtain the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit;

[0022] Calculate the phase shift angle using the phase-frequency compensation characteristic equation;

[0023] Obtain the unbalance angle of the balance wheel using the disc nail signal, the unbalance zero-crossing signal, and the phase shift angle;

[0024] Calculate the measured unbalance weight of the balance wheel using the unbalance signal of the balance wheel.

[0025] Preferably, the step of obtaining the unbalance signal of the balance wheel from the vibration signal during the rotation of the balance wheel includes:

[0026] Collect the vibration signal during the rotation of the balance wheel;

[0027] Amplify the vibration signal;

[0028] Filter the amplified vibration signal to form a low-pass signal;

[0029] Filter the low-pass signal to form a band-pass signal;

[0030] Sample the band-pass signal to form a digital signal; the digital signal is the unbalance signal of the balance wheel.

[0031] Preferably, it further includes:

[0032] Collect the vibration signal during the rotation of the balance wheel;

[0033] Amplify the vibration signal;

[0034] Filter the amplified vibration signal to form a low-pass signal;

[0035] Filter the low-pass signal to form a band-pass signal;

[0036] Convert the band-pass signal into a square-wave signal;

[0037] Sample the signal trailing edge of the square-wave signal to obtain the unbalance zero-crossing signal of the balance wheel.

[0038] Preferably, the step of obtaining the disk stud signal of the balance wheel from the optical signal reflected by the disk stud plane of the balance wheel includes:

[0039] Convert the optical signal reflected by the disk stud plane of the balance wheel to obtain a pulse signal;

[0040] Sample the signal trailing edge of the pulse signal to obtain the disk stud signal of the balance wheel.

[0041] Preferably, the step of obtaining the phase-frequency compensation characteristic equation of the signal conditioning circuit includes:

[0042] Obtain the frequency-phase characteristic curve of the signal filtering and conditioning circuit;

[0043] Take several points on the frequency-phase characteristic curve;

[0044] Establish a scatter plot for the several points;

[0045] Generate the phase-frequency compensation characteristic equation according to the scatter plot.

[0046] Preferably, the phase-frequency compensation characteristic equation is expressed as follows:

[0047]

[0048] Among them, is the rotation frequency of the balance wheel, is the phase offset angle.

[0049] Preferably, the steps of obtaining the balance wheel's heavyweight angle include:

[0050] Measuring the rotation period of the balance wheel using the disk stud signal;

[0051] Obtaining the uncompensated angle from the time difference between the falling edge of the heavyweight zero-crossing signal and the falling edge of the disk stud signal ;

[0052] Obtaining the rotation frequency of the balance wheel using the rotation period of the balance wheel;

[0053] Substituting the rotation frequency of the balance wheel into the phase-frequency compensation characteristic equation to obtain the phase offset angle;

[0054] Calculating the heavyweight angle of the balance wheel using the uncompensated angle and the phase offset angle,

[0055]

[0056] Among them, is the heavyweight angle of the balance wheel, is the phase offset angle.

[0057] Preferably, the balance wheel's heavyweight is obtained by the following formula: balance wheel's heavyweight = maximum value of the heavyweight signal - minimum value of the heavyweight signal.

[0058] The balance wheel heavyweight parameter measurement system and method provided by the present invention have the following beneficial effects: The present invention uses fewer electronic components, is small in size, low in price, simple to operate, and convenient for miniaturized applications. The present invention has a large tolerance for input signals, solving the problem that the input signals of the conditioning circuit in the prior art have clutter interference and cannot work properly. The present invention performs phase compensation by adjusting the characteristics of the circuit, can adapt to multiple frequencies, has high stability, high speed, and can perform phase compensation within one signal period. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention and their design schemes, the accompanying drawings required for the present embodiments will be briefly introduced below. The accompanying drawings in the following description are only partial embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0060] Figure 1 It is the structural diagram of the balance wheel heavyweight parameter measurement system of Embodiment 1 of the present invention;

[0061] Figure 2 This is the circuit diagram of the signal filtering and conditioning circuit according to Embodiment 1 of the present invention;

[0062] Figure 3 This is the timing diagram of the signal processing according to Embodiment 1 of the present invention. Detailed implementation manners

[0063] In order to enable those skilled in the art to better understand the technical solution of the present invention and be able to implement it, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0064] Embodiment 1

[0065] Refer to Figure 1 , the present invention provides a measuring system for the unbalance parameter of a balance wheel, including: a rotational speed optoelectronic sensor, a level converter for the rotational speed signal of the disc pin, an unbalance measuring sensor, an instrumentation amplifier, a signal filtering and conditioning circuit, a zero-crossing comparator, an analog-to-digital converter, and a microprocessor. Among them, the level converter for the rotational speed signal of the disc pin is electrically connected to the rotational speed optoelectronic sensor. The instrumentation amplifier is electrically connected to the unbalance measuring sensor. The signal filtering and conditioning circuit is electrically connected to the instrumentation amplifier. The zero-crossing comparator is electrically connected to the signal filtering and conditioning circuit. The analog-to-digital converter is electrically connected to the signal filtering and conditioning circuit. The microprocessor is electrically connected to the level converter for the rotational speed signal of the disc pin, the zero-crossing comparator, and the analog-to-digital converter.

[0066] In this embodiment, the rotational speed optoelectronic sensor is used to receive the optical signal reflected by the plane of the balance wheel disc pin. The level converter for the rotational speed signal of the disc pin is used to convert the optical signal reflected by the plane of the balance wheel disc pin into a pulse signal. The unbalance measuring sensor is used to obtain the vibration signal when the balance wheel rotates. During the measurement of the balance wheel parameters, the signal transmitted by the sensor is very small, basically below mV, and is often submerged in the stray interference much larger than the useful signal (the interference can reach dozens of mV), and the useful wave in the waveform is completely covered by the interference signal several times larger in amplitude. In this embodiment, the vibration signal is amplified by the instrumentation amplifier. The signal filtering and conditioning circuit is used to filter the vibration signal to form a band-pass signal. The zero-crossing comparator is used to convert the band-pass signal into a square wave signal. The analog-to-digital converter is used to sample the band-pass signal to form a digital signal. The microprocessor is used to obtain the unbalance angle and unbalance weight of the balance wheel by processing the pulse signal, digital signal, and square wave signal.

[0067] In actual tests, the measurement of the unbalance parameter of the balance beam is during the free deceleration process of the balance wheel starting from 45 Hz. Refer to Figure 2, the signal filtering and conditioning circuit includes: a 42 Hz low-pass filter and a 40 Hz band-pass filter. The 42 Hz low-pass filter is electrically connected to the instrumentation amplifier, and the 40 Hz band-pass filter is electrically connected to the 42 Hz low-pass filter. The 42 Hz low-pass filter is used to filter the vibration signal to form a low-pass signal. The 40 Hz band-pass filter is used to filter the low-pass signal to form a band-pass signal.

[0068] In this embodiment, a method for measuring the unbalance parameter of a balance wheel includes the following steps: obtaining the unbalance signal and the unbalance zero-crossing signal of the balance wheel from the vibration signal when the balance wheel rotates; obtaining the disk stud signal of the balance wheel from the optical signal reflected by the plane of the balance wheel disk stud; obtaining the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit; calculating the phase shift angle using the phase-frequency compensation characteristic equation; obtaining the unbalance angle of the balance wheel using the disk stud signal, the unbalance zero-crossing signal, and the phase shift angle; and calculating the measured unbalance weight of the balance wheel using the unbalance signal of the balance wheel.

[0069] In this embodiment, the steps of obtaining the unbalance signal of the balance wheel include: collecting the vibration signal when the balance wheel rotates; amplifying the vibration signal; filtering the amplified vibration signal to form a low-pass signal; filtering the low-pass signal to form a band-pass signal; sampling the band-pass signal to form a digital signal; and the digital signal is the unbalance signal of the balance wheel.

[0070] In this embodiment, the steps of obtaining the unbalance zero-crossing signal of the balance wheel include: collecting the vibration signal when the balance wheel rotates; amplifying the vibration signal; filtering the amplified vibration signal to form a low-pass signal; filtering the low-pass signal to form a band-pass signal; converting the band-pass signal into a square wave signal; and sampling the signal falling edge of the square wave signal to obtain the unbalance zero-crossing signal of the balance wheel.

[0071] In this embodiment, the steps of obtaining the disk stud signal of the balance wheel from the optical signal reflected by the plane of the balance wheel disk stud include: converting the optical signal reflected by the plane of the balance wheel disk stud into a pulse signal; and sampling the signal falling edge of the pulse signal to obtain the disk stud signal of the balance wheel.

[0072] During the free deceleration process of the balance wheel starting from 45 Hz, when passing through 40 Hz, there are two problems to be solved. One is that although it will surely pass through the 40 Hz point during the descent process, since the rotation period is a time interval and 40 Hz is just a time point, there will often be a deviation of zero point several Hz in the measurement. The other is the phase shift caused by the signal conditioning circuit.

[0073] In signal conditioning circuits, filter electronic circuits composed of resistors, capacitors, etc. are often used. Due to the presence of capacitive elements in the circuit, there will be a phase change in the signal before and after processing. That is to say, the input and output signals are not in the same phase, showing a phenomenon of deviating by a certain angle. For example, when conditioning a heavy measurement sensing signal, a conditioning circuit structure of "2nd-order 42Hz Butterworth low-pass filter + 2×2nd-order band-pass filter with fo = 40Hz" is selected. Using a Bode tester to test the phase-frequency characteristic (phase - frequency) of this conditioning circuit, from the test results, at the 40Hz position (cursor 1) of the balance wheel parameter test point, the output waveform deviates from the input waveform by -72.574°, that is, the coordinate point (x1, y1) = (40.0000, -72.5740). And as the frequency changes, the phase of the conditioned signal relative to the phase of the signal before conditioning is changing at any time. For example, at 40.1250Hz (cursor 2) in this filter circuit, the output signal deviates from the input signal by -79.8562°. The frequency change is only 0.125Hz, but the phase angle difference is as much as 7.2822°, and this change trend is non-linear. If applied to a balance wheel parameter measurement system where the required angle measurement deviation is less than ±0.5°, the deviation caused by the angle is unacceptable to the subsequent system. That is to say, the phase deviation after signal conditioning must be strictly controlled, otherwise it cannot be used, and measures must be taken for compensation.

[0074] The relationship between the phase angle of the phase deviation and the frequency is a non-linear characteristic curve. Therefore, before obtaining the heavy angle of the balance wheel, it is necessary to first obtain the characteristic equations before and after signal conditioning, and then calculate the corresponding dynamic compensation angle according to the real-time frequency, and then calculate the actual heavy angle. In this embodiment, the steps to obtain the phase-frequency compensation characteristic equation of the signal conditioning circuit include: obtaining the frequency-phase characteristic curve of the signal filtering and conditioning circuit; taking several points on the frequency-phase characteristic curve; establishing a scatter plot for the several points; generating the phase-frequency compensation characteristic equation according to the scatter plot.

[0075] Among them, the phase-frequency compensation characteristic equation is expressed as follows:

[0076]

[0077] Among them, is the rotation frequency of the balance wheel, is the phase deviation angle.

[0078] In this embodiment, through circuit simulation software, use a Bode instrument to display the frequency-angle characteristic curve, and take the phase angles corresponding to several frequency points on the curve, establish a scatter plot in Excel, and obtain the trend curve formula of this curve. This formula is the phase-frequency compensation characteristic equation of the signal conditioning circuit.

[0079] In this embodiment, the steps of obtaining the unbalance angle of the balance wheel include: measuring the rotation period of the balance wheel (the time interval between two pulse falling edges) using the disk stud signal; obtaining the uncompensated angle from the time difference between the falling edge of the unbalance zero-crossing signal and the falling edge of the disk stud signal ; obtaining the rotation frequency of the balance wheel using the rotation period of the balance wheel, where the rotation frequency of the balance wheel is the reciprocal of the rotation period of the balance wheel; substituting the rotation frequency of the balance wheel into the phase-frequency compensation characteristic equation to obtain the phase offset angle; since the uncompensated angle actually includes the unbalance angle of the balance wheel and the phase offset angle caused by the conditioning circuit , calculating the unbalance angle of the balance wheel using the uncompensated angle and the phase offset angle, , where, is the unbalance angle of the balance wheel, is the uncompensated angle, is the phase offset angle.

[0080] Figure 3 It can be seen from the timing diagram of signal processing during operation that the measurement interval of the balance wheel speed is also the measurement interval of the unbalance weight. The measurement of the unbalance weight is actually the peak-to-peak value of the unbalance signal within this interval. Use a high-speed ADC to quickly sample the voltage value of the unbalance signal and make a real-time comparison to obtain the maximum value max and the minimum value min of the unbalance signal voltage. The difference (max - min) represents the value of the unbalance weight of the balance wheel. In this embodiment, the unbalance weight of the balance wheel is obtained by the following formula: unbalance weight of the balance wheel = maximum value of the unbalance signal - minimum value of the unbalance signal, that is, unbalance weight of the balance wheel = max - min.

[0081] The above embodiments are only preferred specific embodiments of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope disclosed by the present invention all belong to the protection scope of the present invention.

Claims

1. A balance wheel weight parameter measurement system, characterized in that Comprising: A rotational speed optoelectronic sensor for obtaining the optical signal reflected by the plane of the disc pins of the balance wheel; An unbalance measurement sensor for obtaining the vibration signal during the rotation of the balance wheel; A microprocessor electrically connected to a disc pin rotational speed signal level converter, a zero-crossing comparator, and an analog-to-digital converter, for obtaining the unbalance signal and the unbalance zero-crossing signal of the balance wheel through the vibration signal during the rotation of the balance wheel, obtaining the disc pin signal of the balance wheel through the optical signal reflected by the plane of the disc pins of the balance wheel, obtaining the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit, calculating the phase shift angle using the phase-frequency compensation characteristic equation, obtaining the unbalance angle of the balance wheel using the disc pin signal, the unbalance zero-crossing signal, and the phase shift angle, and calculating the measured unbalance weight of the balance wheel using the unbalance signal of the balance wheel.

2. The balance wheel weight parameter measurement system according to claim 1, characterized in that, Further comprising: A disc pin rotational speed signal level converter electrically connected to the rotational speed optoelectronic sensor; The disc pin rotational speed signal level converter is used to convert the optical signal reflected by the plane of the disc pins of the balance wheel into a pulse signal; An instrumentation amplifier electrically connected to the unbalance measurement sensor; the instrumentation amplifier is used to amplify the vibration signal; A signal filtering and conditioning circuit electrically connected to the instrumentation amplifier; the signal filtering and conditioning circuit is used to filter the vibration signal to form a band-pass signal; The signal filtering and conditioning circuit includes: a 42 Hz low-pass filter and a 40 Hz band-pass filter; the 42 Hz low-pass filter is electrically connected to the instrumentation amplifier; the 42 Hz low-pass filter is used to filter the vibration signal to form a low-pass signal; the 40 Hz band-pass filter is electrically connected to the 42 Hz low-pass filter; the 40 Hz band-pass filter is used to filter the low-pass signal to form a band-pass signal; A zero-crossing comparator electrically connected to the signal filtering and conditioning circuit; the zero-crossing comparator is used to convert the band-pass signal into a square wave signal; An analog-to-digital converter electrically connected to the signal filtering and conditioning circuit; the analog-to-digital converter is used to sample the band-pass signal to form a digital signal.

3. A method for measuring the unbalance parameter of a balance wheel, characterized in that, Including the following steps: Obtaining the optical signal reflected by the plane of the disc pins of the balance wheel; Obtaining the vibration signal during the rotation of the balance wheel; Obtaining the unbalance signal and the unbalance zero-crossing signal of the balance wheel through the vibration signal during the rotation of the balance wheel; Obtaining the disc pin signal of the balance wheel through the optical signal reflected by the plane of the disc pins of the balance wheel; Obtaining the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit; Calculating the phase shift angle using the phase-frequency compensation characteristic equation; Obtaining the unbalance angle of the balance wheel using the disc pin signal, the unbalance zero-crossing signal, and the phase shift angle; Calculating the measured unbalance weight of the balance wheel using the unbalance signal of the balance wheel.

4. A method for measuring the weight bias parameter of a balance wheel according to claim 3, characterized in that, The step of obtaining the unbalance signal of the balance wheel through the vibration signal during the rotation of the balance wheel includes: Collecting the vibration signal during the rotation of the balance wheel; Amplifying the vibration signal; Filtering the amplified vibration signal to form a low-pass signal; Filtering the low-pass signal to form a band-pass signal; Sampling the band-pass signal to form a digital signal; the digital signal is the unbalance signal of the balance wheel.

5. A method for measuring the weight bias parameter of a balance wheel according to claim 3, characterized in that Further comprising: Collecting the vibration signal during the rotation of the balance wheel; Amplifying the vibration signal; Filtering the amplified vibration signal to form a low-pass signal; Filtering the low-pass signal to form a band-pass signal; Converting the band-pass signal into a square wave signal; Sampling the signal falling edge of the square wave signal to obtain the zero-crossing signal of the heavy weight of the balance wheel.

6. A method for measuring the balance wheel overweight parameter according to claim 3, characterized in that The step of obtaining the disc stud signal of the balance wheel by the optical signal reflected by the plane of the balance wheel disc stud includes: Converting the optical signal reflected by the plane of the balance wheel disc stud to obtain a pulse signal; Sampling the signal falling edge of the pulse signal to obtain the disc stud signal of the balance wheel.

7. A method for measuring the weight bias parameter of a balance wheel according to claim 3, characterized in that The step of obtaining the phase-frequency compensation characteristic equation of the signal filtering and conditioning circuit includes: Obtaining the frequency-phase characteristic curve of the signal filtering and conditioning circuit; Taking several points on the frequency-phase characteristic curve; Establishing a scatter plot for several points; Generating the phase-frequency compensation characteristic equation according to the scatter plot.

8. A method for measuring the weight parameter of a balance wheel according to claim 7, characterized in that The phase-frequency compensation characteristic equation is expressed as follows: ； Among them, is the rotation frequency of the balance wheel, is the phase offset angle.

9. A method for measuring the balance wheel weight parameter according to claim 3, characterized in that, The step of obtaining the heavy weight angle of the balance wheel includes: Measuring the rotation period of the balance wheel by using the disc stud signal; Obtain the uncompensated angle based on the time difference between the falling edge of the overweight zero-crossing signal and the falling edge of the disk nail signal ; Obtaining the rotation frequency of the balance wheel by using the rotation period of the balance wheel; Substituting the rotation frequency of the balance wheel into the phase-frequency compensation characteristic equation to obtain the phase offset angle; Calculating the heavy weight angle of the balance wheel by using the uncompensated angle and the phase offset angle, ； Among them, is the unbalanced angle of the balance wheel, is the phase offset angle.

10. A method for measuring the balance wheel weight parameter according to claim 3, characterized in that, Obtaining the heavy weight of the balance wheel through the following formula, heavy weight of balance wheel = maximum value of heavy weight signal - minimum value of heavy weight signal.

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