Abstract: Provided is a permanent magnet type motor capable of improving a demagnetization proof stress almost without lowering a generated torque, and reducing a torque ripple and a cogging torque by improving a gap magnetic flux density distribution. In manufacturing a permanent magnet type motor, portions having a low demagnetization proof stress of a plurality of permanent magnets incorporated into a rotor core are partially and equally demagnetized.

Abstract: A permanent magnet type motor of high quality is achieved which is capable of lowering the manufacturing irregularity of the rotor. Provided is a method for manufacturing a permanent magnet type motor in which a permanent magnet is incorporated into a rotor cores stack, the method including a process of forming the rotor core stack, by combining a plurality of core sheets having a magnet insertion hole with a core sheet not having the magnet insertion hole, and disposing the core sheet not having the magnet insertion hole in one end of a stacking direction; a process of injecting a low-viscosity adhesive into the magnet insertion hole in which one end is blocked by the core sheets; and a process of bonding and fixing the permanent magnet by inserting the permanent magnet into the magnet insertion hole into which the low-viscosity adhesive is injected.

Abstract: A method and a system for determining deterioration of permanent magnets of an electric apparatus to be inspected that facilitate determination without the need to remove the electric apparatus from a facility where it is installed. If the electric apparatus to be inspected is a three-phase linear motor, a current detector is used to acquire currents. A three-phase/two-phase conversion section converts the acquired currents into an ?-axis current command and a ?-axis current command. A locus of a current vector is computed based on the ?-axis current command and the ?-axis current command. A comparing and determining section compares the computed locus with a standard upper limit value stored in a storage means. If the number of times that the locus of the current vector exceeds the standard upper limit value exceeds a predetermined value, it is determined that the permanent magnets have been deteriorated.

Abstract: A method and a system for determining deterioration of permanent magnets of an electric apparatus to be inspected that facilitate determination without the need to remove the electric apparatus from a facility where it is installed. If the electric apparatus to be inspected is a three-phase linear motor, a current detector is used to acquire currents. A three-phase/two-phase conversion section converts the acquired currents into an ?-axis current command and a ?-axis current command. A locus of a current vector is computed based on the ?-axis current command and the ?-axis current command. A comparing and determining section compares the computed locus with a standard upper limit value stored in a storage means. If the number of times that the locus of the current vector exceeds the standard upper limit value exceeds a predetermined value, it is determined that the permanent magnets have been deteriorated.

Abstract: A variable valve apparatus comprises a rocker shaft having an eccentric shaft rendered eccentric, a cam provided below the rocker shaft and rotationally driven, a support shaft disposed at a height equal to the rocker shaft, a first arm rockingly supported by the rocker shaft and capable of driving a valve, a second arm rockingly supported by the eccentric shaft and driven by the cam, and a third arm rockingly supported by the support shaft and displaced by rocking of the second arm for driving the first arm, and turns the rocker shaft in the direction of R2 to continuously change the valve opening timing and lift amount of the valve.

Abstract: A variable valve apparatus comprises a rocker shaft having an eccentric shaft rendered eccentric, a cam provided below the rocker shaft and rotationally driven, a support shaft disposed at a height equal to the rocker shaft, a first arm rockingly supported by the rocker shaft and capable of driving a valve, a second arm rockingly supported by the eccentric shaft and driven by the cam, and a third arm rockingly supported by the support shaft and displaced by rocking of the second arm for driving the first arm, and turns the rocker shaft in the direction of R2 to continuously change the valve opening timing and lift amount of the valve.

Abstract: A variable valve mechanism has a switching mechanism for transmitting cam displacement to a first rocker arm from a second rocker arm. A camshaft is disposed obliquely above a rocker shaft. A first abutting portion and a second abutting portion are disposed in a dead space between an upper side of the rocker shaft and a side of the camshaft. The first abutting portion rotationally displaces in a rotational direction of rocker arms together with the first rocker arm. The second abutting portion rotationally displaces together with the second locker arm. The second abutting portion abuts on the first abutting portion from a rotating direction of rocker arms. In the switching mechanism thus configured, displacement of the second rocker arm is transmitted to the first rocker arm with reduced stress burden.

Abstract: The valve drive apparatus of the invention comprises an exhaust valve drive mechanism capable of changing an open/close timing of an exhaust valve, and a control device which controls the exhaust valve drive apparatus so as to release the exhaust valve during an intake stroke, independently of an exhaust stroke, in an EGR mode. Preferably, the exhaust valve drive mechanism comprises a first exhaust cam which defines the exhaust valve releasing timing and the amount of valve lift in the exhaust stroke, and a second exhaust cam which defines the exhaust valve releasing timing and the amount of valve lift during the intake stroke. In an normal mode, the displacement of the first exhaust cam is transmitted to the exhaust valve, and in the EGR mode, the displacement of the second exhaust cam is transmitted to the exhaust valve, in addition to the displacement of the first exhaust cam.

Abstract: A variable valve mechanism has a switching mechanism for transmitting cam displacement to a first rocker arm from a second rocker arm. A camshaft is disposed obliquely above a rocker shaft. A first abutting portion and a second abutting portion are disposed in a dead space between an upper side of the rocker shaft and a side of the camshaft. The first abutting portion rotationally displaces in a rotational direction of rocker arms together with the first rocker arm. The second abutting portion rotationally displaces together with the second locker arm. The second abutting portion abuts on the first abutting portion from a rotating direction of rocker arms. In the switching mechanism thus configured, displacement of the second rocker arm is transmitted to the first rocker arm with reduced stress burden.

Abstract: The valve drive apparatus of the invention comprises an exhaust valve drive mechanism capable of changing an open/close timing of an exhaust valve, and a control device which controls the exhaust valve drive apparatus so as to release the exhaust valve during an intake stroke, independently of an exhaust stroke, in an EGR mode. Preferably, the exhaust valve drive mechanism comprises a first exhaust cam which defines the exhaust valve releasing timing and the amount of valve lift in the exhaust stroke, and a second exhaust cam which defines the exhaust valve releasing timing and the amount of valve lift during the intake stroke. In an normal mode, the displacement of the first exhaust cam is transmitted to the exhaust valve, and in the EGR mode, the displacement of the second exhaust cam is transmitted to the exhaust valve, in addition to the displacement of the first exhaust cam.