CN113671369B - Method for testing minimum starting voltage of gyro motor - Google Patents
Method for testing minimum starting voltage of gyro motor Download PDFInfo
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- CN113671369B CN113671369B CN202110861546.6A CN202110861546A CN113671369B CN 113671369 B CN113671369 B CN 113671369B CN 202110861546 A CN202110861546 A CN 202110861546A CN 113671369 B CN113671369 B CN 113671369B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Abstract
The invention relates to a method for testing minimum starting voltage of a gyro motor, which comprises the following steps: step 1, testing the minimum starting voltage of a motor shaft under different postures at four stages of motor assembly completion, motor installation on a gyro float frame, gyro float encapsulation and gyro integration; and step 2, checking whether the motor has counter potential voltage output after power failure, if so, indicating that the motor can be started under the power supply voltage, recording corresponding power supply voltage values and counter potential voltage values, and if not, indicating that the motor cannot be started under the power supply voltage, continuously increasing the power supply voltage, and electrifying the motor again for checking until the motor counter potential voltage output is seen. The invention can provide a quantitative control means for the quality control in the production process of the gyro motor and ensure the motor starting reliability of the whole life cycle of gyro products.
Description
Technical Field
The invention belongs to the technical field of bearing performance test, relates to a voltage test method of a rotor type gyro motor of a liquid floating machine, and particularly relates to a minimum starting voltage test method of a gyro motor.
Background
The dynamic pressure air bearing is a sliding bearing which uses gas as a lubricant and forms a gas film with a certain pressure in the bearing when the rotor rotates at a high speed. There are bearings in the form of cylindrical, opposed conical, opposed hemispherical, spherical, etc. structures, depending on the geometry. Taking a cylindrical H-shaped dynamic pressure air bearing motor structure as an example, spiral grooves are processed on a left thrust plate, a right thrust plate and a motor shaft; the end faces (thrust faces) of the left thrust plate and the left end cover form a left axial bearing, the end faces (thrust faces) of the right thrust plate and the right end cover form a right axial bearing, and the shaft holes of the motor shaft and the left end cover and the right end cover form radial bearings; the axial and radial bearing double-sided clearance is typically (3-5) microns.
Axial bearing theory of operation: the rotor is dragged by the stator magnetic field to start rotating, the gas at the outer edge of the thrust plate is driven to rotate and pumped into the bearing along the spiral groove, and when the gas enters the root of the groove, the gas is blocked by the step of the groove, so that the pressure rise occurs; as the rotation speed of the rotor increases, the pressure continues to increase, when the pressure increases to a certain value, the rotor is supported, and a dynamic pressure supporting air film without mechanical contact is formed between the thrust surface of the rotor and the thrust plate, so that a thrust bearing is formed.
Radial bearing theory of operation: assuming that the motor shaft is in a horizontal position, theoretically, the shaft hole of the rotor end cover is in line contact with the motor shaft when the rotor is stationary; after the motor is electrified, the rotor overcomes the static friction force between the shaft hole of the end cover and the motor shaft, and enters a contact friction stage with the motor shaft, when the rotating speed of the rotor is continuously increased, the rotor drives gas in the gap to move together, and when a moving gas medium approaches to a gap which is smaller, the gas is compressed to form a wedge-shaped gas film and a corresponding high-pressure area. The rotor rotates in an accelerated manner, and the air film supports the rotor, so that the rotor and the shaft form a dynamic pressure supporting air film without mechanical contact, and a radial bearing is formed.
From the above, the contact points of the axial and radial bearings are different when the motor is in different positions and attitudes. For example, in the horizontal state of the motor shaft, due to the influence of acceleration inertia in different directions during carrying, the thrust surface of the rotor end cover is likely to be attached to a thrust plate, and when the next power-on starting is performed, the rotor overcomes the static friction force between the thrust surface and the thrust plate besides the static friction force between the shaft and the shaft hole; for another example, when the motor shaft is vertical, the rotor has a thrust surface against the thrust plate under the force of gravity, and the static friction between the shaft and the shaft hole may become small due to the positional relationship; when the motor shaft is inclined, the radial bearings and the axial bearings are contacted, and static friction force applied to the rotor is more complex.
Therefore, when the motor is in different positions and postures, the resistance of the motor is different, and the starting performance is also different. Limited by the motor bearing structure, it is inconvenient to directly measure the static friction force between the bearings. In order to be able to evaluate the starting performance of the motor at different production stages, it is necessary to find a quantized method for testing the minimum starting voltage of the gyro motor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for testing the minimum starting voltage of a gyro motor, which can provide a quantitative control means for quality control in the production process of the gyro motor and ensure the motor starting reliability of the whole life cycle of a gyro product.
The invention solves the practical problems by adopting the following technical scheme:
a method for testing minimum starting voltage of a gyro motor comprises the following steps:
step 1, testing the minimum starting voltage of a motor shaft under different postures at four stages of motor assembly completion, motor installation on a gyro float frame, gyro float encapsulation and gyro integration;
and step 2, checking whether the motor has counter potential voltage output after power failure, if so, indicating that the motor can be started under the power supply voltage, recording corresponding power supply voltage values and counter potential voltage values, and if not, indicating that the motor cannot be started under the power supply voltage, continuously increasing the power supply voltage, and electrifying the motor again for checking until the motor counter potential voltage output is seen.
Moreover, the different postures of the motor shaft in the step 1 include: the motor shaft is horizontal, the included angle between the motor shaft rotation direction H and the horizontal is 45 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 90 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 135 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 225 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 270 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 315 degrees, and the included angle between the motor shaft rotation direction H and the horizontal is 360 degrees.
The specific method for checking whether the motor has counter potential voltage output in the step 2 is as follows:
and under each gesture, the power supply voltage is regulated down to any value which can not be started by the motor, the power supply voltage is increased by a fixed step length, the motor is supplied with power for a fixed time, and whether the motor has counter potential voltage output is checked after power failure.
The step size determination method for increasing the power supply voltage comprises the following steps:
λ=rated supply voltage of motor x (1% -2%)
The invention has the advantages and beneficial effects that:
the minimum starting voltage value obtained through the test of the invention represents the magnitude of the static friction moment of the bearing in the current production stage and the current motor shaft gesture, and is an important basis for judging the assembly quality of the bearing. And the change of counter potential voltage obtained by multiple tests under the same starting voltage is measured and can be used as supplement, so that the static friction moment vector sum of different contact parts of the bearing is represented. The invention can provide a quantitative control means for the quality control in the production process of the gyro motor and ensure the motor starting reliability of the whole life cycle of gyro products.
Detailed Description
The following further details examples of the invention:
a method for testing minimum starting voltage of a gyro motor comprises the following steps:
step 1, testing the minimum starting voltage of a motor shaft under different postures at four stages of motor assembly completion, motor installation on a gyro float frame, gyro float encapsulation and gyro integration;
the different postures of the motor shaft in the step 1 include but are not limited to: the motor shaft is horizontal, the included angle between the motor shaft rotation direction H and the horizontal is 45 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 90 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 135 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 225 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 270 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 315 degrees, and the included angle between the motor shaft rotation direction H and the horizontal is 360 degrees.
And step 2, checking whether the motor has counter potential voltage output after power failure, if so, indicating that the motor can be started under the power supply voltage, recording corresponding power supply voltage values and counter potential voltage values, and if not, indicating that the motor cannot be started under the power supply voltage, continuously increasing the power supply voltage, and electrifying the motor again for checking until the motor counter potential voltage output is seen.
The specific method for checking whether the motor has counter potential voltage output in the step 2 is as follows:
and under each gesture, the power supply voltage is regulated down to any value which can not be started by the motor, the power supply voltage is increased by a fixed step length, the motor is supplied with power for a fixed time, and whether the motor has counter potential voltage output is checked after power failure.
Step size determination method for raising power supply voltage:
λ=rated supply voltage of motor x (1% -2%)
In the embodiment, after the motor is assembled, the motor is mounted on the gyro float frame, the gyro float is packaged, and the gyro is integrated, the motor is placed at various positions through the tool, so that the H-shaped bearing can traverse various postures.
In this embodiment, a set of gesture positions is given for reference, as shown in table 1.
Table 1 minimum starting voltage test for a set of motor shafts at different poses
In each gesture, the power supply voltage is regulated down to any value which can not be started by the motor, the power supply voltage is increased by a fixed step length, the motor is supplied with power for a fixed time (the rated voltage power supply time of the motor can be referred to, and the rated voltage power supply time is generally several seconds), and whether the motor has counter potential voltage output is checked after the power is cut off.
Step size determination method for raising power supply voltage:
λ=rated supply voltage of motor x (1% -2%)
If the counter potential voltage exists, the motor can be started under the power supply voltage, the corresponding power supply voltage value and the counter potential voltage value are filled into the table, if the counter potential voltage does not exist, the motor cannot be started under the power supply voltage, the power supply voltage is continuously increased, and the motor is powered on again for checking until the output of the counter potential voltage of the motor can be seen.
In each production stage before the motor is not packaged in the floater, whether the motor is started or not can be judged by visually and actually observing whether the motor rotor rotates or not.
The minimum start-up voltage and back-emf voltage measured at each production stage are reported in table 2.
TABLE 2 minimum Start Voltage test at different stages in the same pose
The method can formulate a control index which accords with reality according to the starting characteristics of the motor, the current motor processing and assembling capability, and compare the control index with measured data to make qualification judgment.
The working principle of the invention is as follows:
the minimum starting voltage value of the invention represents the magnitude of static friction moment of the bearing contact surface in the current production stage and the current motor shaft gesture, and is an important basis for judging the assembly quality of the bearing surface.
The increase amplitude of the static friction moment of the bearing caused by the restraint of the motor in different production stages can be seen from the longitudinal direction of the minimum starting voltage values obtained in different production stages, and a reference is provided for the suppression of the stress in the gyro assembly process.
The change of counter potential voltage obtained by multiple tests under the same starting voltage can be used as supplement, and the static friction moment vector sum of different contact parts of the bearing is represented. Because the resistance force suffered by the motor bearing is mainly the static friction force between the bearings in the starting process, and the radial and axial bearing contact positions are random positions when the motor stops last time, the change of the counter potential voltage can reflect the difference of the static friction force of the bearings.
It should be emphasized that the embodiments described herein are illustrative rather than limiting, and that this invention encompasses other embodiments which may be made by those skilled in the art based on the teachings herein and which fall within the scope of this invention.
Claims (2)
1. A method for testing minimum starting voltage of a gyro motor is characterized by comprising the following steps of: the method comprises the following steps:
step 1, testing the minimum starting voltage of a motor shaft under different postures at four stages of motor assembly completion, motor installation on a gyro float frame, gyro float encapsulation and gyro integration;
step 2, checking whether the motor has counter potential voltage output after power failure, if so, indicating that the motor can be started under the power supply voltage, recording corresponding power supply voltage values and counter potential voltage values, and if not, indicating that the motor cannot be started under the power supply voltage, continuously increasing the power supply voltage, and electrifying the motor again for checking until the motor counter potential voltage output is seen;
the specific method for checking whether the motor has counter potential voltage output in the step 2 is as follows:
under each gesture, the power supply voltage is regulated down to any value which can not be started by the motor, the power supply voltage is increased by a fixed step length, the motor is supplied with power for a fixed time, and whether the motor has counter potential voltage output is checked after power failure;
the step size determination method for increasing the power supply voltage comprises the following steps:
λ=motor rated supply voltage× (1% -2%).
2. The method for testing the minimum starting voltage of the gyro motor according to claim 1, wherein the method comprises the following steps of: the different postures of the motor shaft in the step 1 comprise: the motor shaft is horizontal, the included angle between the motor shaft rotation direction H and the horizontal is 45 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 90 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 135 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 225 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 270 degrees, the included angle between the motor shaft rotation direction H and the horizontal is 315 degrees, and the included angle between the motor shaft rotation direction H and the horizontal is 360 degrees.
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| CN113514180B (en) * | 2021-06-07 | 2023-04-14 | 北京控制工程研究所 | Monitoring, screening and controlling system and method for surface friction torque of bearing of permanent magnet gyro motor |
| CN115655250A (en) * | 2022-12-14 | 2023-01-31 | 西安航天精密机电研究所 | Gyroscope and processing and assembling method thereof |
| CN115615594B (en) * | 2022-12-19 | 2023-03-31 | 西安航天精密机电研究所 | Method for testing starting torque margin of H-shaped dynamic pressure bearing motor |
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