Method for determining the rated capacity of three-phase induction motors in continuous duty under s3 duty
A technology of induction motor and rated capacity, which is used in motor control, estimation/correction of motor parameters, control system, etc., can solve the problem that the rated power is difficult to reasonably determine, so as to improve the utilization rate, reduce the production cost and reduce the probability of failure. Effect
Active Publication Date: 2020-12-01
HARBIN UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
To solve the problem that the rated power of the three-phase induction motor in the S1 working system is difficult to determine reasonably under the S3 working system
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] Embodiment 1: as Figure 1 to Figure 4 As shown, the motor analyzed in this embodiment is a closed three-phase induction motor, and the rated power is 110kW under the S1 working system.
[0029] Step A. Determine 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 described in this embodiment does not exceed 1.8 times the rated power (ie 198kW), the motor can be reliably started. According to the load condition of the motor, the electromagnetic torque generated in the motor is calculated by the formula (1), and the change of the electromagnetic torque with the running time is collected to judge the starting ability of the motor when it is overloaded.
[0030]
[0031] Where: where: T e , T L are electromagnetic torque and load torque respectively; GD 2 is the flywheel torque of the system; n s is the synchronous speed of the motor; ω is the angular velocity of the...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A method for determining a rated capacity of a continuous-duty three-phase induction motor under a S3 working system belongs to the motor control technology field. A problem that the rated power of anS1 working system three-phase induction motor under the S3 working system is difficult to be reasonably determined is solved. The method comprises the following steps of step1, determine a starting ability of a motor during overload operation; step 2, determining an internal loss of the motor; step 3, determining an internal temperature rise limit value of the motor to ensure that a temperature rise of the motor does not exceed the temperature rise during hte overload operation; step 4, calculating the temperature rise of the motor under the S3 working system; applying a periodic load to a motor three-dimensional temperature field calculation model according to a load persistence rate of the motor under the S3 working system and a distribution condition of the internal loss of the motor,and calculating a change condition of the maximum temperature rise in the motor along with running time under the specific load persistence rate of the motor; and step5, obtaining a change rule of thetemperature rise of the motor along with output power under the S3 working system, and providing an intuitive basis for determining the rated capacity of the motor which is operated under the S3 working system.
Description
technical field [0001] The invention relates to a method for determining the rated capacity of a three-phase induction motor under the S3 working system, in particular to a method for determining the rated capacity of the motor when the three-phase induction motor of the continuous working system operates under the S3 working system, which belongs to the motor control technology field. Background technique [0002] The load duty system of the three-phase induction motor is divided into continuous (S1), short-time (S2) and intermittent cycle (S3) load duty systems. Three-phase induction motors are widely used, and in its drive system, there are various requirements for the motor to run with load. Three-phase induction motors usually have a large thermal capacity, which allows short-term overload operation to achieve high power output. If the safe and reliable operation of an electric motor under various load working conditions can be guaranteed, the production efficiency ca...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/14H02P29/60
CPCH02P23/14H02P29/60
Inventor 夏云彦杜皓温嘉斌
Owner HARBIN UNIV OF SCI & TECH