A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotor 400 made of a permanent magnet, a stator including multiple pole teeth 223, 243, 323 and 343 extending in an axial direction of the rotor 400 arranged at an outer circumferential side of the rotor 400, a bearing 250 rotatably supporting one end portion in the axial direction of the rotor 400, and a bearing 260 rotatably supporting the other end portion in the axial direction of the rotor 400. Magnetic permeability of the bearing 260 is greater than that of the bearing 250, the rotor 400 includes multiple magnetic poles on an outer circumferential surface along a circumferential direction of the rotor 400, and an outer diameter D.sub.R of the rotor 400, an outer diameter D.sub.B of a portion of the bearing 260 which is facing the rotor 400, and a pitch P of the multiple magnetic poles of the rotor 400 are set to satisfy the following relationship of formula 1

(D.sub.RP)=<D.sub.B=<D.sub.R(Formula 1).

A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotor 400 made of a permanent magnet, a stator including multiple pole teeth 223, 243, 323 and 343 extending in an axial direction of the rotor 400 arranged at an outer circumferential side of the rotor 400, a bearing 250 rotatably supporting one end portion in the axial direction of the rotor 400, and a bearing 260 rotatably supporting the other end portion in the axial direction of the rotor 400. Magnetic permeability of the bearing 260 is greater than that of the bearing 250, the rotor 400 includes multiple magnetic poles on an outer circumferential surface along a circumferential direction of the rotor 400, and an outer diameter D.sub.R of the rotor 400, an outer diameter D.sub.B of a portion of the bearing 260 which is facing the rotor 400, and a pitch P of the multiple magnetic poles of the rotor 400 are set to satisfy the following relationship of formula 1

(D.sub.RP)=<D.sub.B=<D.sub.R(Formula 1).

A press-fit mounting peg (2) for retaining a component such as a stepped-motor on a circuit board (21). The mounting peg (2) is securable in a mounted position by a first axial displacement of a locking pin (17) along a pin channel (16) of the press-fit mounting peg (2) in a first axial direction along a longitudinal axis of the press-fit mounting peg (2) from a first axial position to a second axial position. The pin channel (16) comprises at least one pin displacement stop (13, 20) for stopping a second axial displacement of the locking pin (17) out of the second axial position.

A press-fit mounting peg (2) for retaining a component such as a stepped-motor on a circuit board (21). The mounting peg (2) is securable in a mounted position by a first axial displacement of a locking pin (17) along a pin channel (16) of the press-fit mounting peg (2) in a first axial direction along a longitudinal axis of the press-fit mounting peg (2) from a first axial position to a second axial position. The pin channel (16) comprises at least one pin displacement stop (13, 20) for stopping a second axial displacement of the locking pin (17) out of the second axial position.

Provided are: a geared motor with which a large torque can be obtained without an increase in size; and a method for producing said geared motor. In this geared motor (1), an output member (8) having a helical groove (83) formed in an outer circumferential section is provided between a first plate part (31) and a second plate part (32) of a frame (3), and the rotation of a motor pinion (55) is reduced in speed by a reduction gear mechanism (9) and is transmitted to a gear part (85) of the output member (8). In this geared motor (1): the output member (8) is arranged between the first plate part (31) and the second plate part (32); then, a first fixing shaft (35) is inserted from a through hole (37) in the second plate part (32) into a shaft hole (81) in the output member (8), and a first shaft end part (351) is fitted into a first fixing shaft support hole (36); and then, a second shaft end part (352) and the second plate part (32) are fixed.

Provided are: a geared motor with which a large torque can be obtained without an increase in size; and a method for producing said geared motor. In this geared motor (1), an output member (8) having a helical groove (83) formed in an outer circumferential section is provided between a first plate part (31) and a second plate part (32) of a frame (3), and the rotation of a motor pinion (55) is reduced in speed by a reduction gear mechanism (9) and is transmitted to a gear part (85) of the output member (8). In this geared motor (1): the output member (8) is arranged between the first plate part (31) and the second plate part (32); then, a first fixing shaft (35) is inserted from a through hole (37) in the second plate part (32) into a shaft hole (81) in the output member (8), and a first shaft end part (351) is fitted into a first fixing shaft support hole (36); and then, a second shaft end part (352) and the second plate part (32) are fixed.

A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a current setting unit, and a current control unit. The input voltage measuring unit measures an input voltage input to the motor control device. The temperature measuring unit measures the temperature. The current setting unit sets a target value of drive current to flow through a coil of a stepping motor based on a measurement result of the input voltage measuring unit and a measurement result of the temperature measuring unit and based on a set value of drive current preset for each of plural partial areas, which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The current control unit controls the drive current according to the target value of the drive current set in the current setting unit.

A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a current setting unit, and a current control unit. The input voltage measuring unit measures an input voltage input to the motor control device. The temperature measuring unit measures the temperature. The current setting unit sets a target value of drive current to flow through a coil of a stepping motor based on a measurement result of the input voltage measuring unit and a measurement result of the temperature measuring unit and based on a set value of drive current preset for each of plural partial areas, which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The current control unit controls the drive current according to the target value of the drive current set in the current setting unit.

A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a speed setting unit, and a speed control unit. The input voltage measuring unit measures an input voltage input to a motor control device. The temperature measuring unit measures the temperature. The speed setting unit sets a target value of driving speed of a stepping motor based on a measurement result of the input voltage measuring unit, a measurement result of the temperature measuring unit and based on a set value of driving speed preset for each of the plural partial areas which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The speed control unit controls the driving speed according to the target value of the driving speed set in the speed setting unit.

A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a speed setting unit, and a speed control unit. The input voltage measuring unit measures an input voltage input to a motor control device. The temperature measuring unit measures the temperature. The speed setting unit sets a target value of driving speed of a stepping motor based on a measurement result of the input voltage measuring unit, a measurement result of the temperature measuring unit and based on a set value of driving speed preset for each of the plural partial areas which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The speed control unit controls the driving speed according to the target value of the driving speed set in the speed setting unit.