Electrically Excited Double Salient Linear Motor

Abstract

The invention discloses an electro-magnetic doubly-salient linear motor. The electro-magnetic doubly-salient linear motor comprises primary teeth, secondary teeth and air gaps between the primary teeth and the secondary teeth, wherein the primary teeth are rotors, the secondary teeth are stators, the primary teeth and the secondary teeth adopt salient pole structures respectively, a direct-current exciting winding and a three-phase armature winding are wound on each primary tooth, and the proportion of primary pole pitch tau p to secondary pole pitch tau s is that tau s / tau p is equal to 5 / 6, the primary pole pitch is twice of the tooth pitch of the primary teeth, and the tooth pitch of the secondary pole pitch is equal to or slightly greater than the tooth pitch of the primary teeth; due to the fact that the exciting windings are wound on each primary tooth respectively, the paths of each phase of flux are the same, and three-phase flux linkages and counter potential waveforms are relatively symmetrical; complementary characteristics exist between the m-th phase of winding and the (m+3)-th phase of winding, one phase is formed after inverted series connection of m phase, and the flux linkage and no-load counter potentital symmetry of the phase are improved. When the electro-magnetic doubly-salient linear motor works, the output thrust pulse can be effectively reduced, the electro-magnetic doubly-salient linear motor is novel in structure, reliable in performance and simple in control, and the electro-magnetic doubly-salient linear motor is applicable for medium-and-low-power power generation or electric occasions for relatively high output requirements.

Description

technical field [0001] The invention relates to the field of motor body design, in particular to an electric excitation double salient pole linear motor. Background technique [0002] With the development of industry, higher requirements are put forward for the control system of the control motor. The traditional linear motion device driven by the rotary motor is far from meeting the requirements of the control system. In this case, the research and application of linear motors has become a hot field. Many countries in the world are researching and developing linear motors, which makes linear motors more and more widely used. Compared with non-linear motor drive, the new device driven by linear motor has the advantages of simple structure, no contact, no wear, low noise, fast speed, high precision and flexible combination, which greatly promotes the rapid development of manufacturing industry. [0003] At present, linear motors are widely used in the working conditions that...

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Problems solved by technology

However, the flux linkage of the armature winding of this motor is unipolar. For example, the number of primary and secondary teeth is equal to (6 / 4)k rotating motor, which has many disadvantages, such as back EMF asymmetry and large harmonic content, making the output Thrust pulsation is large, which greatly limits the application of motors in industry

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