CN110429892B - Method for determining rated capacity of continuous operation three-phase induction motor under S3 operation system - Google Patents
Method for determining rated capacity of continuous operation three-phase induction motor under S3 operation system Download PDFInfo
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- CN110429892B CN110429892B CN201910753269.XA CN201910753269A CN110429892B CN 110429892 B CN110429892 B CN 110429892B CN 201910753269 A CN201910753269 A CN 201910753269A CN 110429892 B CN110429892 B CN 110429892B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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Abstract
A method for determining rated capacity of a continuous-working three-phase induction motor under an S3 working condition belongs to the technical field of motor control, and solves the problem that rated power of the continuous-working three-phase induction motor under an S1 working condition is difficult to reasonably determine under an S3 working condition. The technical points are as follows: step 1: judging the starting capacity of the motor during overload operation; step 2: determining the internal loss of the motor; and step 3: determining a temperature rise limit value in the motor, and ensuring that the temperature rise of the motor does not exceed the temperature rise when the motor runs in an overload mode; and 4, step 4: calculating the temperature rise of the motor under the working condition of S3; applying periodic load to a three-dimensional temperature field calculation model of the motor according to the load duration rate of the motor under the working condition of S3 and the distribution condition of loss in the motor, and calculating the change condition of the maximum temperature rise of the motor along with the running time under the specific load duration rate; and 5: and acquiring the change rule of the motor temperature rise along with the output power under the S3 working condition, and providing an intuitive basis for determining the rated capacity when the motor operates under the S3 working condition.
Description
Technical Field
The invention relates to a method for determining rated capacity of a three-phase induction motor under an S3 working condition, in particular to a method for determining the rated capacity of the motor when the three-phase induction motor under a S3 working condition is operated under a continuous working condition, and belongs to the technical field of motor control.
Background
The load operation system of the three-phase induction motor is divided into a continuous (S1), a short-time (S2), an intermittent cycle (S3), and other load operation systems. The three-phase induction motor is widely applied, and the requirements of the motor running with load in a dragging system of the three-phase induction motor are various. Three-phase induction motors typically have a large thermal capacity, allowing short-term overload operation to achieve a large power output. If the safe and reliable operation of one motor under various load working conditions can be ensured, the production efficiency can be greatly improved. However, in practical application, it is difficult to determine the rated power that one motor can output under different load operating systems, and if the load is not reasonable, the motor is not fully utilized or heated if the load is not reasonable, and the motor is burnt if the load is heavy.
Disclosure of Invention
The invention aims to provide a method for determining the rated capacity of a continuous-operation three-phase induction motor under an S3 operation system, which provides a basis for ensuring the safe and reliable operation of an S1 operation system motor under an S3 operation system. The determination of the motor capacity under different working conditions is mainly influenced by the temperature rise of the motor, on the premise of ensuring the starting capability of the motor, the temperature rise of the motor under the S3 working condition and different load continuation rates of the motor is calculated according to the loss condition in the motor when the motor runs in an overload condition, and the influence rule of the output power of the motor on the temperature rise of the motor under different load continuation rates is obtained, so that the quick and reasonable determination of the rated output power of the motor under the S3 working condition is realized. The problem that the rated power of the three-phase induction motor in the S1 work system is difficult to reasonably determine under the S3 work system is solved.
In order to achieve the purpose, the invention adopts the following technical scheme, and the specific steps are as follows:
step 1: judging the starting capacity of the motor during overload operation;
calculating the electromagnetic torque of the motor in the whole starting process according to the load condition of the motor, ensuring that the electromagnetic torque is greater than the load torque in the starting process, avoiding stalling and ensuring overload capacity;
step 2: determining the internal loss of the motor;
obtaining the loss (I) of the stator winding and the rotor conducting bar of the motor according to the resistance, reactance parameters and the current value in the winding2R); determining the iron core loss according to the magnetic field distribution in the motor;
and step 3: determining a temperature rise limit value in the motor;
calculating the temperature rise of the motor in rated operation under the S1 working condition to obtain the highest temperature rise value in the motor, and taking the value as the temperature rise limit value of the motor in overload operation under the S3 working condition to ensure that the temperature rise of the motor in overload operation does not exceed the temperature rise;
and 4, step 4: calculating the temperature rise of the motor under the working condition of S3;
applying periodic load to a three-dimensional temperature field calculation model of the motor according to the load duration and the distribution of loss in the motor under the working condition of S3, and calculating the change of the maximum temperature rise in the motor along with the running time under the load durations of 15%, 25%, 40% and 60%;
and 5: obtaining the change rule of the motor temperature rise along with the output power under the working condition of S3;
according to the calculation results of the motor temperature rise under different overload degrees, the change rule of the motor temperature rise along with the output power under the load continuous rates of 15%, 25%, 40% and 60% of the motor is obtained, and visual basis is provided for determining the rated capacity of the motor when the motor operates under the S3 working system.
Further: in step 4, the motor three-dimensional temperature field calculation model comprises a stator winding, an iron core, an air gap, a rotor conducting bar and an iron core; the stator winding, the rotor conducting bar and the stator iron core are main heating sources in the motor.
Further: in step 5, by calculating the temperature rise of the motor under different overload degrees, the rule of the influence of different load persistence rates on the temperature rise of the motor under a certain fixed output capacity can be obtained, and a basis is provided for selecting the working mode of the motor S3 when a certain fixed load is driven.
Further: in step 1, the electromagnetic torque of the motor is calculated by formula (1)
In the formula: t ise、TLElectromagnetic torque and load torque respectively; GD (GD) device2Is the flywheel torque of the system; n issThe synchronous rotating speed of the motor is obtained; omega is the angular speed of the rotor; pNThe rated power of the motor.
Further: in step 4, the GB755 stipulates the basic technical requirements of the rotating motor, one operation cycle of the motor in the S3 work system is 10min, and the load duration is divided into four types, namely 15%, 25%, 40% and 60%.
The invention achieves the following effects:
the invention provides a method for determining the rated capacity of a motor when a continuous working motor is applied to S3 working system. The method comprises the steps of judging the starting capability of the motor according to the size of a motor dragging load, calculating the temperature rise in the motor when the load duration rates of the motor under the S3 working system are respectively 15%, 25%, 40% and 60% on the premise of ensuring smooth starting, so as to obtain the relation between the motor running capacity and the motor temperature rise, and providing a quick and accurate method for determining the rated load capacity of the motor under the S3 working system.
Drawings
Fig. 1 is a graph showing the influence of output power on the temperature rise of a motor when the motor operates at S3 operating mode and at different load continuous rates;
FIG. 2 is a schematic diagram of a three-dimensional temperature field calculation model of a motor;
FIG. 3 is a graph of the maximum temperature rise of the motor with the operation time when the motor drives a 1.3-time load (i.e., the output power of the motor is 143kW) and operates under the S3 working condition with the load duration rate of 60%;
fig. 4 is a graph of the maximum temperature rise in the motor as a function of the operation time when the motor drives a 1.4-time load (i.e., when the motor has an output power of 154 kW) and operates at different load durations in the S3 operating system.
Detailed Description
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
Example 1: as shown in fig. 1 to 4, the motor analyzed in this embodiment is a closed three-phase induction motor, and the rated power of the motor under the S1 operation system is 110 kW.
And step A, determining the starting capability of the motor according to the calculation result of the electromagnetic torque of the motor. When the output power of the motor does not exceed 1.8 times of the rated power (i.e. 198kW) in the embodiment, the motor can be started reliably. According to the motor load condition, the electromagnetic torque generated in the motor is calculated by the formula (1), the change condition of the electromagnetic torque along with the running time is collected, and the starting capability of the motor during overload running is judged.
Wherein: in the formula: t ise、TLElectromagnetic torque and load torque respectively; GD (GD) device2Is the flywheel torque of the system; n issThe synchronous rotating speed of the motor is obtained; omega is the angular speed of the rotor; pNThe rated power of the motor.
Step B, calculating the losses of the stator winding and the rotor conducting bar in the motor when driving different loads according to the current value of the motor winding and the winding resistance when the motor S1 works under rated load and the motor runs in overload (I)2R) and calculating according to the magnetic flux density and the alternating frequency in the motor to obtain the internal loss of the motor core.
And step C, taking the loss value in the motor under the rated load as a boundary condition of a three-dimensional temperature field calculation model (shown in figure 2), solving a transient temperature field, and obtaining the change condition of the temperature rise in the motor along with time. According to the calculated change situation of the highest temperature rise in the motor along with the running time, when the temperature is stable, the highest temperature rise in the motor is 91K, and the temperature rise value is used as the temperature rise limit value when the motor runs.
And step D, according to the provisions of GB755 basic technical requirements of rotating motors, one operation cycle of the motor in an S3 working system is 10min, and the load duration is divided into four types, namely 15%, 25%, 40% and 60%. And setting each operation period of the motor under the operation condition of S3 as 10 minutes, applying periodic load to the temperature field calculation model according to the load duration rate of the motor in each operation period, and calculating the temperature rise change condition of the motor. The curve of the variation of the maximum temperature rise in the motor with the running time when the motor is driven by 1.3 times of load and the load duration rate is 60% is calculated and shown in fig. 3. Therefore, when the continuous-working three-phase induction motor in the embodiment operates in the S3 working system and the driving load is less than 1.3 times of the rated load, the maximum temperature rise in the motor does not exceed the temperature rise limit.
When the motor in the embodiment drives a load 1.4 times (i.e. when the output power of the motor is 154 kW), the maximum temperature rise in the motor varies with the operation time under different load durations of the operation system of S3 as shown in fig. 4, and when the load durations are 15%, 25%, 40% and 60%, respectively, the steady-state maximum temperature rises reached by the motor are 28K, 46K, 71K and 101K, respectively, so that it can be known that the temperature rise of the motor exceeds the temperature rise limit value when the load duration is 60%, which may cause the motor to overheat. The motor three-dimensional temperature field calculation model comprises a stator winding, an iron core, an air gap, a rotor conducting bar and an iron core; the stator winding, the rotor conducting bar and the stator iron core are main heating sources in the motor.
And step E, according to the temperature rise calculation method in the step D, the highest temperature rise value reached in the motor under the S3 work condition with the load duration rate of 15%, 25%, 40% and 60% can be obtained when the operation capacity of the motor is 165kW, 176kW, 187kW and 198kW respectively. Accordingly, the rule of the influence of the output power on the temperature rise of the motor when the motor runs under different load continuous rates of the S3 working system can be obtained, as shown in FIG. 1.
When the load duration rate is 60%, the maximum temperature rise of the motor stator winding is always greater than the temperature rise limit value 91K. Therefore, when the motor of the S1 operation system is operated at the S3 operation system and the 60% load duration, the output power of the motor cannot exceed 1.3 times the rated load, i.e., 143 kW. At a motor load continuation rate of 40%, when the motor output power exceeds 174kW, the motor stator winding temperature will rise above the temperature rise limit of 91K. Therefore, when the motor of the S1 operation system is operated at the 40% load continuation rate of the S3 operation system, the output power of the motor cannot exceed 174 kW. When the load continuation rate of the motor is 25% and 15%, the temperature rise of the stator winding cannot reach the temperature rise limit value 91K under the load capacity of the motor capable of being started and operated normally, so that the motor capable of being operated in the S1 working mode can be operated safely in the S3 working mode under the condition that the load continuation rate is 25% and 15% and the starting capability is guaranteed. According to the obtained relation between the output power and the temperature rise, the rated capacity of the motor under the S3 work condition can be determined quickly and accurately, and the safe operation of the motor is ensured.
Although the embodiments of the present invention have been described above, the contents thereof are merely embodiments adopted to facilitate understanding of the technical aspects of the present invention, and are not intended to limit the present invention. It will be apparent to persons skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. The method for determining the rated capacity of the continuous-working three-phase induction motor under the S3 working condition is characterized by comprising the following specific steps:
step 1: judging the starting capacity of the motor during overload operation;
calculating the electromagnetic torque of the motor in the whole starting process according to the load condition of the motor, ensuring that the electromagnetic torque is greater than the load torque in the starting process, avoiding stalling and ensuring overload capacity;
step 2: determining the internal loss of the motor;
obtaining the loss of a stator winding and a rotor conducting bar of the motor according to the resistance, reactance parameters and the current value in the winding of the motor; determining the iron core loss according to the magnetic field distribution in the motor;
and step 3: determining a temperature rise limit value in the motor;
calculating the temperature rise of the motor in rated operation under the S1 working condition to obtain the highest temperature rise value in the motor, and taking the value as the temperature rise limit value of the motor in overload operation under the S3 working condition to ensure that the temperature rise of the motor in overload operation does not exceed the temperature rise;
and 4, step 4: calculating the temperature rise of the motor under the working condition of S3;
applying periodic load to a three-dimensional temperature field calculation model of the motor according to the load duration and the distribution of loss in the motor under the working condition of S3, and calculating the change of the maximum temperature rise in the motor along with the running time under the load durations of 15%, 25%, 40% and 60%;
and 5: obtaining the change rule of the motor temperature rise along with the output power under the working condition of S3;
according to the calculation results of the motor temperature rise under different overload degrees, the change rule of the motor temperature rise along with the output power under the load continuous rates of 15%, 25%, 40% and 60% of the motor is obtained, and visual basis is provided for determining the rated capacity of the motor when the motor operates under the S3 working system.
2. The method for determining the rated capacity of a continuously operating three-phase induction motor according to claim 1 under the S3 operating condition, wherein: in step 4, the motor three-dimensional temperature field calculation model comprises a stator winding, an iron core, an air gap, a rotor conducting bar and an iron core; the stator winding, the rotor conducting bar and the stator iron core are main heating sources in the motor.
3. The method for determining the rated capacity of a continuously operating three-phase induction motor according to claim 2 under S3 operating conditions, wherein: in step 5, by calculating the temperature rise of the motor under different overload degrees, the rule of the influence of different load persistence rates on the temperature rise of the motor under a certain fixed output capacity can be obtained, and a basis is provided for selecting the working mode of the motor S3 when a certain fixed load is driven.
4. The method for determining the rated capacity of a continuously operating three-phase induction motor according to claim 3 under the S3 operating condition, wherein: in step 1, the electromagnetic torque of the motor is calculated by formula (1)
In the formula:
、
electromagnetic torque and load torque respectively;
is the flywheel torque of the system;
the synchronous rotating speed of the motor is obtained;
is the rotor angular velocity;
the rated power of the motor.
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| CN106208577A (en) * | 2015-06-02 | 2016-12-07 | 北京富特盘式电机有限公司 | A kind of integral lifting apparatus disc type brake asynchronous motor |
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| CN109066596A (en) * | 2018-09-20 | 2018-12-21 | 哈尔滨理工大学 | The motor circuit protector and its working method of adjustable electric machine operation state |
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2019
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| JPH06153559A (en) * | 1992-11-12 | 1994-05-31 | Yaskawa Electric Corp | Method for detecting overload in servo-control equipment |
| CN106208577A (en) * | 2015-06-02 | 2016-12-07 | 北京富特盘式电机有限公司 | A kind of integral lifting apparatus disc type brake asynchronous motor |
| CN105243249A (en) * | 2015-11-18 | 2016-01-13 | 哈尔滨理工大学 | Three-phase induction motor transient temperature rise calculation model and measuring calculation method |
| CN205986399U (en) * | 2016-09-09 | 2017-02-22 | 佛山市顺德区信源电机有限公司 | High -efficient threephase asynchronous machine |
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