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Large power low speed Permanent Magnet Synchronous motors are more and more widely used in propulsion areas. Their tests are relatively more inconvenient because some special and large power equipments are needed. In this paper, according to the features of multiphase and multiunit for these kinds of motors, a novel and simplified testing method of copper loss and its temperature raise is brought...
Vibration and noise reduction is one of the most important requirements in the design of PMSM due to its direct impact on service life and operating stability. The radial electromagnetic force acted on the rotor is a major factor of a PMSM influencing on its vibration and noise. In this paper, the distribution characteristics of radial electromagnetic force were theoretically analyzed on the basis...
Stator excitation and the radial electromagnetic force acted on the rotor can excite mechanical resonances, vibration and noise induced will directly impact on service life and operating stability of the motor. In this paper, the radial electromagnetic forces distribution characteristics have been theoretically simulation investigated on the basis of 2D FEM method. Several methods are adopted to reduce...
Characteristics test of large power motors were usually restricted by suitable power supply or load in laboratory, therefore prediction analysis of tests are needed sometimes. In this paper, a 2MW multiunit and multiphase structure of the large power low speed PMSM is theoretically analyzed, and tests of different unit-matching were carried out to validate the theoretical analysis and prediction,...
Electromagnetic clutch is a new kind of magnetic mechanism which has the unique advantages of non-contact and flexible transmission, low noise and lubrication, and inherent overload protection. A novel structure non-contact electromagnetic clutch which adopts the magneto resistive effect is introduced in this paper. Research on principle analysis and all steady and dynamic state characteristics were...
Cogging torque reduction is one of the most important requirements in the design of BLDC motors due to its direct impact on the performance of the motor. In this paper, the influences of tooth width and slot/pole match on cogging torque corresponding to both uniformed teeth and nonuniformed teeth were theoretically analyzed on the basis of analytical expressions of cogging torque deduced with energy...
Counter propagation arithmetic is make up of this paper presents a fault diagnosis model for power transformer based on counter propagation network. The compound neural networks model is build first and parameters of CP Networks are confirmed by comparing the results in different situations. The diagnostic examples indicate the validity of the proposed method. The diagnosis correctness of the new...
Permanent magnetic gear (PMG) is a new kind of non-contact power transmission device which has unique advantages to be applied in the situations of airproof and small vibration requirements. A new kind of large torque permanent magnetic gear box with flexible transmission ratio is introduced in this paper. Research on principle analysis and transmission characteristics were carried out on the basis...
Along with the progress of intelligent control and robot technology, machine arms, which are not so easy to be effected by the environment, easy operated, have taken place of human in more and more field. The motor used in the joint of machine arm is very important and has more influence on the system. The choice of the motor and relative method of control has more or less effect on the cost, operating...
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