36results about How to "High air gap magnetic induction" patented technology

The invention provides a double-row permanent magnet centripetal excitation rectangular open magnetic field type electromagnetic vibration table magnetic circuit structure with eddy current compensation, belonging to the field of vibration measurement technology. A rectangular open type magnetic field structure design is provided. Two rows of permanent magnets are symmetrically installed at the inner side of a long magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction density distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surface of a center magnet yoke adjacent to the air gaps is provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. According to the double-row permanent magnet centripetal excitation rectangular open magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

A cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure centripetally excited by a long permanent magnetism tube belongs to the technical field of vibration measurement. A cylindrical enclosed magnetic field structure is provided, the permanent magnetism tube is coaxially assembled in the inner part of a long cylindrical outer magnet yoke in a bonded manner, magnetic poles of the inner cylindrical surface of the permanent magnetism tube are identical in polarity, an enclosed magnetic circuit is formed through magnet yokes, and a magnetic field high in uniformity is generated in an air gap. After a working coil is powered on, the working coil in the magnetic field is affected by a Lorentz force and generates a precise and controllable electromagnetic driving force. The surface, adjacent to the air gap, of a central magnet yoke is provided with an array-type microstructure arranged in a deep channel mode, and the eddy current loss can be effectively inhibited. According to the invention, a large stroke, high magnetic field uniformity, a large thrust and linear electromagnetic driving force characteristics can be considered at the same time, defects of an existing technical scheme are effectively overcome, and a high-precision and large-stoke electromagnetic shake table magnetic circuit structure technical scheme is provided for low-frequency / ultralow-frequency vibration calibration.

The invention provides a double-row permanent magnet centripetal excitation rectangular low frequency vibration table with magnetic field tracking compensation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two rows of permanent magnets are symmetrically installed at the inner side surfaces of a long magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. The surfaces of the magnet yoke adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The center magnet yoke is provided with a compensation coil, and a formed compensation magnetic field carries out synchronous tracking compensation on the influence of an armature reaction. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision can be obtained at the same time. According to the double-row permanent magnet centripetal excitation rectangular low frequency vibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and a high precision and large stroke high performance low frequency vibration calibration table technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

The invention provides a double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with eddy current compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two cylindrical permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. According to the double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

The invention provides a double-permanent-magnetic-tube two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with magnetic field tracking compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two permanent magnet tubes are symmetrically installed and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. A center magnet yoke is provided with a compensation coil, the direction of the current is opposite to that in a working coil, phase tracking is synchronized, amplitudes are proportional, and a formed compensation magnetic field can carry out synchronous tracking compensation on the influence of an armature reaction. According to the double-permanent-magnetic-tube two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

The invention provides a double-row permanent magnet centripetal excitation rectangular open magnetic field type low frequency vibration table with eddy current compensation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two rows of permanent magnets are symmetrically installed at the inner side surfaces of a long magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surface of a center magnet yoke adjacent to the air gaps is provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the double-row permanent magnet centripetal excitation rectangular open magnetic field type low frequency vibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and a high precision and large stroke high performance low frequency vibration calibration table technical scheme is provided for low-frequency / ultra-low frequency vibration calibration.

Provided is a magnetic circuit structure for a rectangular open-type magnetic field of an electromagnetic shaking table by adopting double rows of permanent magnets with centripetal excitation for tracking and compensation of the magnetic field, pertaining to the technical field of vibration and measurement. Provided is structural design of the rectangular open-type magnetic field. The double rows of permanent magnets are symmetrically arranged at insides of long magnet yokes with same magnetic poles oppositely arranged. By means of magnet yokes, a symmetrical closed magnetic circuit is formed. Magnetic inductive intensity distribution with high evenness is generated in an air gap. Compensating coils are arranged on a central magnet yoke. Galvanized electric current is opposite to electric current of working coils in direction and proportionate to phase synchronous tracking and amplitude. A formed compensating magnetic field is used for tracking and compensating for influence of armature reaction. Considerations are taken into large stroke, uniformity of a high magnetic field, high thrust and features of linear electromagnetic driving force so that a technical scheme, with high precision and large stroke, of the magnetic circuit structure of the electromagnetic shaking table is provided for low frequency / ultra-low frequency vibration calibration.