Presented are a single coil apparatus and a method of forming. An exemplary apparatus includes solenoid assembly. The solenoid assembly includes a core tube extending along a longitudinal axis. The solenoid assembly further includes a first magnet and a second magnet located outside the core tube, the first magnet spaced along the longitudinal axis from the second magnet, and an excitation coil disposed radially outward of the first magnet and the second magnet.

A linear resonant actuator includes a ferritic tube, a movable mass, first and second flexures, and a set of one or more flexures. The ferritic tube has an axis extending from a first end of the ferritic tube to a second end of the ferritic tube. The movable mass has a set of magnet sections disposed along the axis. First and second flexures mechanically couple first and second ends of the movable mass to the ferritic tube. The flexures suspend the movable mass within the ferritic tube and allow movement of the movable mass along the axis. The electric coil(s) are attached to the ferritic tube and extend around the movable mass, between the ferritic tube and the movable mass. Each magnet section has magnetic poles disposed at different positions along the axis, and like magnetic poles of adjacent magnetic sections face each other.

A linear resonant actuator includes a ferritic tube, a movable mass, first and second flexures, and a set of one or more flexures. The ferritic tube has an axis extending from a first end of the ferritic tube to a second end of the ferritic tube. The movable mass has a set of magnet sections disposed along the axis. First and second flexures mechanically couple first and second ends of the movable mass to the ferritic tube. The flexures suspend the movable mass within the ferritic tube and allow movement of the movable mass along the axis. The electric coil(s) are attached to the ferritic tube and extend around the movable mass, between the ferritic tube and the movable mass. Each magnet section has magnetic poles disposed at different positions along the axis, and like magnetic poles of adjacent magnetic sections face each other.

A harvest transducer includes a moving cylinder; a coil system having a first coil and a second coil, the first coil and the second coil being surrounding the moving cylinder, the coil system further having magnetic means for generating a magnetic field and arranged on the moving cylinder; a rechargeable battery electrically connected with the second coil to store energy generated from the coil system; wherein the first coil and the second coil are connected in series.

A harvest transducer includes a moving cylinder; a coil system having a first coil and a second coil, the first coil and the second coil being surrounding the moving cylinder, the coil system further having magnetic means for generating a magnetic field and arranged on the moving cylinder; a rechargeable battery electrically connected with the second coil to store energy generated from the coil system; wherein the first coil and the second coil are connected in series.

This actuator includes a movable body provided with a magnet and a yoke, and a support body provided with a case and a coil. A first case member includes a first case third side plate portion and a first case fourth side plate portion that are opposed in an X direction. A coil holder includes press-fitted fixed portions that are press-fitted between the first case third side plate portion and the first case fourth side plate portion. The press-fitted fixed portions include one side fixing surface and an other side fixing surface that make contact with leading edge parts of the first case third side plate portion and the first case fourth side plate portion, which are in a Z2 direction, from the inside, and parts further toward a Z1 side than the fixed surfaces are recessed.

This actuator includes a movable body provided with a magnet and a yoke, and a support body provided with a case and a coil. A first case member includes a first case third side plate portion and a first case fourth side plate portion that are opposed in an X direction. A coil holder includes press-fitted fixed portions that are press-fitted between the first case third side plate portion and the first case fourth side plate portion. The press-fitted fixed portions include one side fixing surface and an other side fixing surface that make contact with leading edge parts of the first case third side plate portion and the first case fourth side plate portion, which are in a Z2 direction, from the inside, and parts further toward a Z1 side than the fixed surfaces are recessed.

This actuator includes a movable body provided with a magnet and a yoke, and a support body provided with a case and a coil, and vibrates the movable body. The yoke includes a first opposing portion and a second opposing portion that oppose the coil from both sides in a Z direction. A pair of second joining plate portions that extend from both ends of the second opposing portion are fitted inside a pair of first joining plate portions that extend from both ends of the first opposing portion. In the yoke, both sides of a pair of first connecting bodies that connect the first opposing portion and a first plate that covers the coil from a Z1 direction, and both sides of a pair of second connecting bodies that connect the second opposing portion and a second plate that covers the coil from a Z2 direction, are notched.

This actuator includes a movable body provided with a magnet and a yoke, and a support body provided with a case and a coil, and vibrates the movable body. The yoke includes a first opposing portion and a second opposing portion that oppose the coil from both sides in a Z direction. A pair of second joining plate portions that extend from both ends of the second opposing portion are fitted inside a pair of first joining plate portions that extend from both ends of the first opposing portion. In the yoke, both sides of a pair of first connecting bodies that connect the first opposing portion and a first plate that covers the coil from a Z1 direction, and both sides of a pair of second connecting bodies that connect the second opposing portion and a second plate that covers the coil from a Z2 direction, are notched.

The present invention provides a linear vibration motor, including a housing having an accommodating space, a vibrator disposed in the accommodating space, and a coil fixed in the housing and driving the vibrator to move. The vibrator includes a magnetic circuit system. The linear vibration motor further includes a restoring assembly fixed to the housing. The restoring assembly is made of magnetic steel and is magnetized along a direction perpendicular to a direction in which the vibrator moves. Compared with an existing spring structure, in the linear vibration motor of the present disclosure, a magnetic interaction force is formed between a restoring assembly and a vibrator to restore a vibrator. In this way, an anti-humidity and anti-high-temperature effect of the restoring assembly is improved by replacing an interaction force of a spring with a magnetic interaction force.