Abstract: A single axis actuator includes a driving-side timing pulley located at one end in a longitudinal direction of a device frame in such a manner that a rotational center thereof is vertically oriented, a rotation transmission shaft coaxially connected to the driving-side timing pulley and extending upwardly, a driven-side timing pulley located at another end in the longitudinal direction of the device frame in such a manner that a rotation shaft thereof is vertically oriented, a timing belt bridged between the driving-side and driven-side timing pulleys, a slider connected to a part of the timing belt to be made movable in the longitudinal direction of the device frame, and a motor having a motor shaft that is connected to an upper end of the rotation transmission shaft.

Abstract: To provide a motor core and a motor capable of reducing cogging torque and torque ripple by the shape of a pole tooth of a stator. An end surface of a pole tooth of a stator is formed such that a cross-section of the end surface along a circumferential direction is a curved surface having an arc shape that protrudes in a direction opposite to a direction in which an end surface of a magnet of a rotor (equivalent to an outer periphery of a rotor yoke part), which is opposed to the end surface, protrudes.

Abstract: A single axis actuator includes a driving-side timing pulley located at one end in a longitudinal direction of a device frame in such a manner that a rotational center thereof is vertically oriented, a rotation transmission shaft coaxially connected to the driving-side timing pulley and extending upwardly, a driven-side timing pulley located at another end in the longitudinal direction of the device frame in such a manner that a rotation shaft thereof is vertically oriented, a timing belt bridged between the driving-side and driven-side timing pulleys, a slider connected to a part of the timing belt to be made movable in the longitudinal direction of the device frame, and a motor having a motor shaft that is connected to an upper end of the rotation transmission shaft.

Abstract: Since a housing 101 is integrally formed with a frame main body 123A of a frame 223 so as to surround a rotor yoke 258 and a stator yoke 242, heat generated from a motor 109 is conducted to the housing 101 to be thereby emitted to the outside. Accordingly, a heat transfer property and a cooling effect of the motor 109 are remarkably improved compared with a case that the housing 101 is formed into a member separated from a frame 123. As a result, it is possible to realize an increase in output of the motor 109 as well as a decrease in size and weight, thereby realizing a decrease in size of an electric power steering apparatus as a whole.