Linear motor

A linear motor comprising:

• field magnets spaced at equal intervals from one another and having an equal pitch;
• and
• a rotor arranged to move opposite to said field magnets and including an armature core divided into first and second block cores,
• each of said block cores including armature coils wound in the form of a concentrated winding and having nine teeth arranged at equal pitch, said armature coils of said block cores being wound with their phases shifted by an electrical angle corresponding to a distance between said block cores, said block cores having a length equivalent to eight times the pitch of said field magnets, the distance between said block cores being equivalent to one half of the pitch of said field magnets, said armature coils of said first block core being wound in the order of U phase, V phase and W phase with said teeth being grouped three by three, said armature coils of said second block core being arranged such that said second block core has one coil of V phase wound around a first tooth, a coil of W phase wound around the next three teeth, a coil of U phase wound around the next three teeth, and a coil of V phase wound around the remaining two teeth, said armature coils being wound in the form of a balanced three-phase winding with a difference of 90° in phase.

A linear motor, comprising:

• field magnets spaced at equal intervals from one another and having an equal pitch;
• and
• a rotor arranged to move opposite to said field magnets and including an armature core divided into first and second block cores,
• each of said first and second block cores including armature coils wound in the form of a concentrated winding and having nine teeth arranged at equal pitch, said armature coils of said first and second block cores being wound with their phases shifted by an electrical angle corresponding to a distance between said block cores, said block cores having a length equivalent to eight times the pitch of said field magnets, the distance between said block cores being equivalent to one half of the pitch of said field magnets, said armature coils of said first block core being wound in the order of U phase, V phase and W phase with said teeth grouped three by three, said armature coils of said second block core being wound in the order of V phase, W phase and U phase with said teeth grouped three by three, said armature coils being wound in the form of a balanced three-phase winding with a difference of 90° in phase.

A linear motor, comprising:

• field magnets spaced at equal intervals from one another and having an equal pitch;
• and
• a rotor arranged to move in a thrust direction opposite to said field magnets, said rotor including an armature core divided into at least three block cores equally spaced apart from one another,
• each of said block cores including teeth and armature coils wound in the form of a concentrated winding around said teeth with the phases of said armature coils being shifted by an electrical angle corresponding to the distance between said block cores.

A method for constructing a linear motor, comprising the steps of:

• spacing field magnets at equal intervals from one another with the field magnets having an equal pitch;
• arranging a rotor having an armature core opposite the field magnets;
• dividing the armature core into at least three block cores, each block core including teeth and armature coils wound in the form of a concentrated winding around the teeth;
• determining a distance between the block cores by dividing the electrical angle of the pitch of the field magnets by the number of block cores and multiplying the result by an integer less than the number of block cores;
• and
• spacing the block cores equidistant from one another by the determined distance.