A linear motor includes a stator and a mover. The stator has a plurality of salient poles. The mover includes a plurality of first teeth; a plurality of coils respectively mounted on the periphery of the plurality of first teeth; a plurality of first magnets respectively buried within the first teeth; a second tooth provided outside the plurality of first teeth; and a second magnet buried within the second tooth. The second tooth includes a first portion on the opposite side of the first teeth with respect to the second magnet; and a second portion close to the first teeth with respect to the second magnet. In a protruding direction of the second tooth, an edge of the first portion is farther from the stator than an edge of the second portion.

An electric linear motor for an elevator and a method for controlling the operation thereof are presented. The electric linear motor comprises at least one stator beam and at least one mover, wherein said at least one stator beam comprises at least two stators on opposite sides of the stator beam, and the at least one mover is in electromagnetic engagement with said at least two stators and configured to be moved relative to said stator beam. Said at least one mover comprises at least two units of electromagnetic components arranged on opposite sides of the stator beam to face said at least two stators for controlling the movement and the position of the mover with respect to said stator beam.

The invention relates to an elevator comprising an electric linear motor comprising at least one linear stator designed to be located in a fixed correlation to an environment, particularly building, and at least one mover designed for connection with an elevator car to be moved and co-acting with the stator to move the car, which motor comprises a stator beam supporting said at least one stator, which stator beam has at least one side face carrying ferromagnetic poles of said stator spaced apart by a pitch, and which mover comprises at least one counter-face facing said side face(s) of the stator beam, in which counter-face electro-magnetic components of the mover are arranged to co-act with the ferromagnetic poles mounted on the stator beam, which elevator comprises an elevator brake. According to the invention the side face of the stator beam facing the mover and/or the counter face of the mover facing the side face of the stator beam comprise(s) a brake surface which form(s) the brake interface of the elevator brake.

The invention relates to a drive system (1) with electromagnetic energy transfer. The system (1) comprises a track (3) comprising a plurality of stators (4), each stator (4) having at least one winding adapted to generate a magnetic field having a fundamental harmonic (8) and at least one further harmonic (9) when fed with an varying current, and a movable element (2) comprising a primary magnetic element (5) adapted to receive said fundamental harmonic (8) to drive said movable element (2) along said track. The system (1) is characterized in that said movable element (2) further comprises a secondary magnetic element (6a-6c) adapted to receive said at least one further harmonic (9) to generate power onboard of said movable element (2). The invention also relates to a linear fractional slot synchronous machine and a rotational synchronous machine.

A method for levitation control of a linear motor includes supplying an alternating current or alternating voltage to at least one oscillating circuit including at least one sensing coil being or assumed to be arranged in a fixed spatial correlation to a mover part of the linear motor such that an opening plane of the sensing coil faces a sensor counter-surface of a stator part of the linear motor with a gap therebetween; receiving a response signal from the oscillating circuit; determining a gap length of the gap based on the response signal; and controlling the gap length by driving a magnetic levitation unit of the linear motor based on the determined gap length. An inductive sensing device and an elevator system, and a method for determining a position of the linear motor are also disclosed.

A moving body includes: a plurality of linear motors including a first linear motor driven by magnetic interaction with magnetic flux of a magnetic pole path; a position detection sensor configured to detect a position of the moving body; a first electrical angle detection sensor disposed at a position different from the position detection sensor in a path direction of the magnetic pole path and configured to detect an electrical angle of the first linear motor; and a control unit configured to, when one of the position detection sensor and the first electrical angle detection sensor is positioned at a magnetic pole absent section, use the other of the position detection sensor and the first electrical angle detection sensor both to detect a position of the moving body and to detect an electrical angle of the first linear motor.

An object is to provide a linear motor in which even when the overall length of the linear motor is long, the amount of magnets to be employed does not increase and hence size reduction and weight reduction of a stator is realized. A linear motor comprising a stator 2 and a movable element 1 provided with a coil 1a is characterized in that: the stator 2 includes two plate-shaped parts elongated in a moving direction of the movable element 1 and the two plate-shaped parts are provided facing each other so as to be magnetically linked in such a manner that a movement domain of the movable element 1 is located in between; in each of surfaces facing each other in the two plate-shaped parts, a plurality of tooth parts 21a and 22a are aligned in the moving direction such that the tooth parts 21a (22a) of one plate-shaped part and the tooth parts 22a (21a) of the other plate-shaped part are located in a staggered manner; in the movable element 1, inside the coil 1a, two magnets 1c, 1d and three yokes 1b are alternately arranged along the moving direction; and the two magnets 1c and 1d are magnetized along the moving direction and the magnetization directions are opposite to each other.

A moving core type reciprocating motor is provided that may include a stator on which a coil may be wound and having an air gap; a magnet fixed to the stator; and a mover that includes a moving core disposed to face the magnet in the air gap and reciprocates with respect to the stator. The magnet may have a first pole and a second pole that are different poles arranged in a reciprocation direction of the mover, and a length of the first pole may be larger than a length of the second pole.

Apparatus (200) for use as a motor or generator, comprising: a first part (210); a second part (230) movable relative to the first part (210) and spaced from the first part (210) by an air gap (260); and a plurality of spaced activatable magnet elements (220) provided on the first part (210), each activatable magnet element (220) being operative when activated by application of an electric current thereto to direct a magnetic field across the air gap (260) towards the second part (230); wherein each activatable magnet element (220) comprises: a pole piece (222) defining an air-gap facing surface (223A, 223B), the pole piece (222) comprising: a first limb (224A); a second limb (224B); and a coil-winding section (224C) positioned between the first and second limbs (224A, 224B); a permanent magnet arrangement (225) provided between the first and second limbs 224A, 224B) of the pole piece; and an electrically conductive coil (226) wound around the coil-winding section (224C) of the pole piece, wherein the electrically conductive coil (226) is operative to generate a magnetic flux oriented to oppose the magnetic flux of the permanent magnet arrangement (225); characterised in that the pole piece (222) further comprises a parallel flux path section (224D) extending in parallel to the coil-winding section (224C) operative to allow magnetic flux from the permanent magnet arrangement (225) to flow in parallel to the coil-winding section (224C).

An apparatus including a motor housing which includes a plurality of electrical connector apertures through the motor housing; a plurality of first electrical connectors which include a projecting pin section; a plurality of second electrical connectors which include a socket section configured to receive a respective projecting pin section; and a casing configured to press the first electrical connectors against respective seals at the electrical connector apertures to seal the electrical connector apertures. The first electrical connectors project through the respective seals. The projecting pin sections are located in the respective socket sections of the second electrical connectors with a press-fit therebetween to thereby connect the first and second electrical connectors.