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Reliability calculation method for dual-redundancy brushless direct current motor control system

A brushed DC motor and control system technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as high cost and long time, and achieve the effect of reducing cost and shortening life test time

Active Publication Date: 2021-09-24
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to solve the problems of long time and high cost in the life test of the dual-redundancy brushless DC motor control system in the prior art, the present invention provides a method for calculating the reliability of the dual-redundancy brushless DC motor control system, which can be calculated by the formula The reliability of the dual redundant brushless DC motor control system is obtained, which avoids the complicated and long-term reliability measurement experiment of the dual redundant brushless DC motor control system

Method used

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  • Reliability calculation method for dual-redundancy brushless direct current motor control system
  • Reliability calculation method for dual-redundancy brushless direct current motor control system
  • Reliability calculation method for dual-redundancy brushless direct current motor control system

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Embodiment 1

[0081] A dual-redundant brushless DC motor control system with a rated voltage of 270V and a rated speed of 1000r / min, the topology of its control circuit is as follows: figure 2 As shown, calculate the reliability of this type of motor after running for 18000 hours (about 2 years).

[0082] Step 1: The main faults of the dual redundant brushless DC motor control system are divided into winding faults, permanent magnet faults, Hall sensor faults, control chip faults, power tube faults and bearing faults.

[0083] Step 2: Calculate the failure rate and reliability of the stator winding of the dual-redundancy brushless DC motor control system.

[0084] The failure rate of the first set of windings is: λ p11 =λ b1 π E1 π Q1 π K1 π C1

[0085] The failure rate of the second set of windings is: λ p12 =λ b1 π E1 π Q1 π K1 π C1

[0086] take lambda b1 =0.0205×10 -6 , π E1 = 2, π Q1 =0.6, π K1 = 1, π C1 = 1, the total reliability of the stator winding after workin...

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Abstract

The invention relates to a reliability calculation method for a dual-redundancy brushless direct current motor control system, and belongs to the technical field of motors. The method comprises the following steps of: firstly, determining each part which is liable to fail in an operation process of the dual-redundancy brushless direct current motor control system, and establishing a reliability model of the dual-redundancy brushless direct current motor control system according to a connection mode among the parts. Generally, parts liable to fail of the dual-redundancy brushless direct current motor control system are respectively a stator winding, a permanent magnet, a Hall sensor, a control chip, a power tube and a bearing. The failure rate and the reliability of each part are independently calculated by analyzing influence factors influencing failures of each part, and finally the total reliability of the dual-redundancy brushless direct current motor control system is calculated through the reliability model. According to the method, the reliability of the motor control system is accurately calculated, and the working efficiency of life testing of the dual-redundancy brushless direct current motor control system is improved.

Description

technical field [0001] The invention belongs to the field of motor control, in particular to a method for calculating the reliability of a double redundancy brushless direct current motor control system. Background technique [0002] In aerospace, the reliability requirements for motors are very high, and the operation reliability of motors with double redundancy will be greatly improved compared with single motors. Under normal conditions, the main components that affect the reliability of the dual-redundancy brushless DC motor control system are: windings, permanent magnets, Hall sensors, control chips, power tubes, and bearings. The faults of motor windings include open-circuit faults and short-circuit faults. The dual-redundancy motor uses two sets of windings to share one motor rotor to improve the reliability of the motor. The Hall sensor in the dual-redundancy motor is used to detect the position of the rotor. As a semiconductor device, the Hall sensor is prone to on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/04
CPCG06F30/20G06F2119/04
Inventor 付朝阳刘兴邦刘铮孙平
Owner NORTHWESTERN POLYTECHNICAL UNIV
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