Abstract: A field magnet holder provided at a field portion of an electric motor is formed of a non-magnetic material. An inner wall and outer wall of the field magnet holder are respectively formed in annular shapes. Plural spacers are arranged between the inner wall and outer wall at a predetermined spacing in the circumferential direction. Sockets into which permanent magnets are inserted are formed between the spacers of the field magnet holder, plurally in the circumferential direction. Therefore, the permanent magnets may be easily assembled by being respectively inserted into the sockets. The plural permanent magnets are arrayed with magnetization directions thereof successively changed in steps of an angle that is a full cycle of electrical angles divided by a division number n, which division number n is any one integer that is at least three. Thus, ease of assembly of the permanent magnets is improved.

Abstract: A field portion of a rotor of an electric motor includes plural permanent magnets arranged in a circumferential direction with magnetization directions thereof changing in steps of a predetermined angle. A stator is disposed at a radial direction outer side of the field portion. At the stator, three-phase coils of an armature are arranged in the circumferential direction at an inner periphery face of an annular outer cylinder. A ferromagnetic material is used in the outer cylinder, such that magnetic flux density in a magnetic field from the field portion is at least a residual magnetic flux density. A thickness dimension of the outer cylinder is set such that magnetic saturation is caused by the field portion. Consequently, an outer diameter of the stator may be reduced while torque ripple due to the magnet arrangement of the field portion is suppressed, and power output density may be improved.

Abstract: In an electric motor, three-phase coils are provided to an armature disposed between an outside field system and an inside field system, and Halbach arrays are employed in the outside field system and the inside field system. Each of the Halbach arrays is divided by a number of divisions that is any number computed by adding two to a multiple of three. Permanent magnets are arrayed such that their magnetization directions are changed in sequence by steps of an angle computed by dividing one cycle's worth of electric angle by the number of divisions. Torque ripple is thereby suppressed in the electric motor.

Abstract: In an electric motor, three-phase coils are provided to an armature disposed between an outside field system and an inside field system, and Halbach arrays are employed in the outside field system and the inside field system. Each of the Halbach arrays is divided by a number of divisions that is any number computed by adding two to a multiple of three. Permanent magnets are arrayed such that their magnetization directions are changed in sequence by steps of an angle computed by dividing one cycle's worth of electric angle by the number of divisions. Torque ripple is thereby suppressed in the electric motor.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective electromagnets (71aa, 73aa, 71ba, 73ba), it is also possible to adjust fluxes (or flux density) in respective directions x, y individually.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective electromagnets (71aa, 73aa, 71ba, 73ba), it is also possible to adjust fluxes (or flux density) in respective directions x, y individually.

Abstract: An exciting voltage arithmetic portion calculates an exciting voltage of an electromagnet using a signal of a gap sensor. On the other hand, a sensorless exciting voltage arithmetic portion calculates an exciting voltage of the electromagnet using a signal of the current sensor. The exciting voltage adjusting portion adjusts a mixing ratio between an output value of an exciting voltage arithmetic portion and an output value of the sensorless exciting voltage arithmetic portion corresponding to a gap length. The excitation of the electromagnet is controlled according to an output value of the exciting voltage adjusting portion so as to reduce influences of noises on the gap sensors thereby always achieving a stable levitation control.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective magnetic poles.

Abstract: An elevator includes guide rails laid in an elevator shaft vertically, an elevator car moving up and down along the guide rails, guiding units provided on the elevator car for guiding it, the guiding unit having a magnet unit including cores and coils forming electromagnets to generate a magnetic force against the guide rail through an air gap and a controller for controlling the magnetic force by maneuvering an exciting current for exciting the electromagnets. The controller controls the magnetic force so as to make the guiding units in non-contact with the guide rails when the elevator car is traveling and brings the guiding units into contact with the guide rails when the elevator car is stopped, so that the guiding units attract and fix the guide rails while the elevator car is stopped.

Abstract: A control device sets parameters “n”, “ad”, “pd”, “aq”, “pq” and the like of a motor parameter setting unit, corrects a d-axis current command value outputted from a d-axis current instructing unit and a q-axis current command value outputted from q-axis current instructing unit based on these parameters of the motor parameter setting unit, on a detection result of a rotation angle detection unit, and makes a (6×n)f sine component, (6×n)f cosine component, (6×(n+1))f sine component, and (6×(n+1))f cosine component of torque to zero. In such a way, 6×n and 6×(n+1) ripple components and the like, which are generated in a motor provided in elevator equipment or the like, are suppressed, and a torque ripple of the motor is reduced to a large extent.

Abstract: An exciting voltage arithmetic portion calculates an exciting voltage of an electromagnet using a signal of a gap sensor. On the other hand, a sensorless exciting voltage arithmetic portion calculates an exciting voltage of the electromagnet using a signal of the current sensor. The exciting voltage adjusting portion adjusts a mixing ratio between an output value of an exciting voltage arithmetic portion and an output value of the sensorless exciting voltage arithmetic portion corresponding to a gap length. The excitation of the electromagnet is controlled according to an output value of the exciting voltage adjusting portion so as to reduce influences of noises on the gap sensors thereby always achieving a stable levitation control.

Abstract: Parameters “n”, “ad”, “pd”, “aq”, “pq” and the like of a motor parameter setting unit 4 are set so as to satisfy [Expression 23] and the like, a d-axis current command value “Idco” outputted from a d-axis current instructing unit 2 and a q-axis current command value “Iqco” outputted from q-axis current instructing unit 3 are corrected based on these parameters “n”, “ad”, “pd”, “aq” and “pq”, on a detection result of rotation angle detecting unit 11, and on the like, and a (6×n)f sine component, (6×n)f cosine component, (6×(n+1))f sine component and (6×(n+1))f cosine component of torque “T” shown in [Expression 22] are made zero. In such a way, 6×n and 6×(n+1) ripple components and the like, which are generated in a motor provided in elevator equipment or the like, are suppressed, and a torque ripple of the motor is reduced to a large extent.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective magnetic poles.

Abstract: An elevator includes guide rails (2) laid in an elevator shaft vertically, an elevator car (3) moving up and down along the guide rails, guiding units (6) provided on the elevator car for guiding it, the guiding unit having a magnet unit including cores (11) and coils (12) forming electromagnets to generate a magnetic force against the guide rail through an air gap and a controller (21) for controlling the magnetic force by maneuvering an exciting current for exciting the electromagnets. The controller (21) controls the magnetic force so as to make the guiding units in non-contact with the guide rails when the elevator car is traveling and brings the guiding units into contact with the guide rails when the elevator car is stopped, so that the guiding units attract and fix the guide rails while the elevator car is stopped.

Abstract: Torque ripple of a motor due to a rotation detection device is reduced. A periodicity gain multiplier 51 multiplies the rotation angle ? of a detection target by a ripple periodic number m per rotation of the detection target. An adder 53 adds a phase adjusting value “?” from a phase adjustor 49 to the value “m?”. The value “sin(m?+?)”, which is calculated by a sine calculator 55, is multiplied by a predetermined gain G by an amplitude adjustor 57 and by the angular velocity ? of the detection target by a multiplier 59. A subtractor 61 subtracts the output of the multiplier 59 from the value “?” and outputs “?(1?G sin(m?+?))”. The output of the subtractor 61 and the output “m?+?” of the adder 53 are input to the phase adjustor 49 and amplitude adjustor 57. The phase adjustor 49 calculates the phase adjusting value “?” based on the summation of the derivative values of the outputs from the subtractor 61 sampled for each “?/2” of the output from the adder 53.

Abstract: Torque ripple of a motor due to a rotation detection device is reduced. A periodicity gain multiplier 51 multiplies the rotation angle ? of a detection target by a ripple periodic number m per rotation of the detection target. An adder 53 adds a phase adjusting value “?” from a phase adjustor 49 to the value “m?”. The value “sin(m?+?)”, which is calculated by a sine calculator 55, is multiplied by a predetermined gain G by an amplitude adjustor 57 and by the angular velocity ? of the detection target by a multiplier 59. A subtractor 61 subtracts the output of the multiplier 59 from the value “?” and outputs “?(1?Gsin(m?+?))”. The output of the subtractor 61 and the output “m?+?” of the adder 53 are input to the phase adjustor 49 and amplitude adjustor 57. The phase adjustor 49 calculates the phase adjusting value “?” based on the summation of the derivative values of the outputs from the subtractor 61sampled for each “?/2” of the output from the adder 53.

Abstract: A vibration controller controls vibrations generated in a driven object included in a system subject to vibrations due to the dynamic unbalance or eccentricity of a rotating member driven for rotation by an electric motor. An angular position transforming unit (45) and an angular velocity transforming unit (47) transform the output signal of a rotating motion measuring means (C1) into an angular position and an angular velocity, respectively. A sine calculating unit (55) calculates the sine of an angle obtained by adding up the angular position and a predetermined phase angle provided by a phase adjusting unit (49) by an adder (53). A multiplier (61) calculates the product of the output of a gain adjusting unit (57) that multiplies the output of the sine calculating unit (55) by a predetermined gain and the output of a multiplier (59) that calculates the square of the angular velocity. Again adjusting unit (57?) multiplies the output of a sine calculating unit (55?) by a predetermined gain.

Abstract: The rotary detector according to this invention comprises a rotary detector unit C1, C1? which detects rotary motion of a rotor; and a rotary calculator unit C2, C2?, C2? comprising a rotation angle detector, which detects the rotation angle of the rotor, and an angle speed detector 47 which detects the angle speed of the rotor, based on the output of the rotary detector unit. The rotary calculator unit comprises a trigonometrical calculator C3, C3?, C3? which calculates a sine value or a cosine value of the rotation angle detected by the rotary detector; a gain adjuster 57, 57?, 57? which multiplies the sine value or the cosine value, calculated by the trigonometrical calculator, by a predetermined gain; a multiplier 59, 59? which multiplies the output of the gain adjuster by the output of the angle speed detector; and a subtracter 61, 61? which subtracts the output of the multiplier from the output of the angle speed detector.

Abstract: A vibration controller controls vibrations generated in a driven object included in a system subject to vibrations due to the dynamic unbalance or eccentricity of a rotating member driven for rotation by an electric motor. An angular position transforming unit (45) and an angular velocity transforming unit (47) transform the output signal of a rotating motion measuring means (C1) into an angular position and an angular velocity, respectively. A sine calculating unit (55) calculates the sine of an angle obtained by adding up the angular position and a predetermined phase angle provided by a phase adjusting unit (49) by an adder (53). A multiplier (61) calculates the product of the output of a gain adjusting unit (57) that multiplies the output of the sine calculating unit (55) by a predetermined gain and the output of a multiplier (59) that calculates the square of the angular velocity. Again adjusting unit (57?) multiplies the output of a sine calculating unit (55?) by a predetermined gain.

Abstract: The rotary detector according to this invention comprises a rotary detector unit C1, C1? which detects rotary motion of a rotor; and a rotary calculator unit C2, C2?, C2? comprising a rotation angle detector, which detects the rotation angle of the rotor, and an angle speed detector 47 which detects the angle speed of the rotor, based on the output of the rotary detector unit. The rotary calculator unit comprises a trigonometrical calculator C3, C3?, C3? which calculates a sine value or a cosine value of the rotation angle detected by the rotary detector; a gain adjuster 57, 57?, 57? which multiplies the sine value or the cosine value, calculated by the trigonometrical calculator, by a predetermined gain; a multiplier 59, 59? which multiplies the output of the gain adjuster by the output of the angle speed detector; and a subtracter 61, 61? which subtracts the output of the multiplier from the output of the angle speed detector.