JP2529472Y2 - Electric motor - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention]

(Industrial Application Field) The present invention relates to an electric motor that is rotated at a constant angle in one direction. (Prior Art) This type of motor is generally well known as a stepping motor. For example, a motor having a stator having a plurality of magnetic poles and rotating by exciting and demagnetizing the magnetic poles of each phase in order. It has a rotor. (Problems to be Solved by the Invention) By the way, the above-described stepping motor is operated in a state where the rotor is stopped by flowing the rated exciting current.
If the load torque from the outside exceeds the static maximum torque, the rotor will be displaced from the excitation pole. Therefore, it is considered good to use the load torque to be about one third or less of the static maximum torque. For this reason, when the rotor is stationary, particularly when used as a drive source for a device in which a large load torque in the reverse direction is expected, a large motor having a maximum stationary torque corresponding to this may be used, or the motor may be used together with the motor. A separate reverse rotation prevention mechanism must be used together, and there has been a problem in improving the performance of the motor alone. (Purpose of the invention) This invention has been made by focusing on the above-described problem, and has a function of preventing reverse rotation as a motor alone.
It is another object of the present invention to provide an electric motor capable of realizing miniaturization and the like.

[Structure of device]

(Means for Solving the Problems) An electric motor according to the present invention is provided with a movable piece that reciprocates by rotating the magnetic poles of each phase alternately on a shaft of a stator having two-phase magnetic poles. On the shaft of the stator, two rotating members are axially arranged and rotatably mounted, and on the outer periphery of each rotating member, a separate rotation transmitting mechanism that transmits in only one direction is provided in the same operating direction, and The rotating body is mounted via the two rotation transmitting mechanisms, and both rotating members are provided with holding rods extending in the radial direction, respectively, and the center of the joint arm is rotatably mounted on the motor housing via a pin. The end of each holding rod is connected to both ends of the joint arm, and both rotating members are connected to each other so as to rotate in opposite directions by the holding rod and the joint arm, and one holding rod is provided on the movable piece. At the joint A configuration is such that one of the rotating members and the movable piece are reciprocally rotated integrally with each other by engagement, and the above configuration is a means for solving the problem. (Effects of the Invention) The electric motor according to the invention is configured such that when the two-phase magnetic poles of the stator are alternately excited and the movable piece reciprocates, the rotation transmission mechanism that transmits in only one direction transmits the motor to the movable piece. One rotating member in the engaged state, and the other rotating member connected to the one rotating member by the holding rod and the joint arm so as to rotate in the reverse direction, are alternately transmitted to the rotating body.
The idle rotation is repeated, and the operation direction is the same in both rotation transmission mechanisms, so that the rotated body rotates in one direction. Also, even if a load torque in the reverse direction is applied to the rotated body serving as the output unit, the reverse rotation of the rotated body is prevented by the rotation transmission mechanism that transmits the rotation in only one direction. (Embodiment) An embodiment of the present invention will be described below with reference to FIGS. That is, as shown in FIGS. 1 to 3, the electric motor 1 causes the shaft 3 of the stator 2 having the two-phase magnetic poles A and B to alternately excite the magnetic poles A and B of each phase. The movable piece 4 is reciprocally rotated. The stator 2 has four protruding portions 2a in an X-shape around a fixing portion 2e to the motor housing H which is partially illustrated.
22d, and the projections at 180 ° different positions (2a, 2b, and 2
(c, 2d) as one set, and the coil is wound around each pair to provide a configuration having two-phase magnetic poles A and B. The movable piece 4 is rotatably attached to the shaft 3 via a bearing 5 and has four bent portions 4a to 4d opposed to each other at a predetermined interval on the tip end surfaces of the protrusions 2a to 2d. ing. These bends 4a
~ 4d are those located at 180 ° different positions (4a, 4b and 4c, 4
d) form one set, and one set of bent portions 4a, 4b faces the protruding portions 2a, 2b of one magnetic pole A, and the other set of bent portions 4c, 4d Magnetic pole B projections 2c, 2d
From the same direction of rotation. On the shaft 3 of the stator 2, two rotating members 6, 7 are rotatably mounted in a state of being arranged in the axial direction. Also, on the outer circumference of both rotating members 6, 7, individual rotation transmitting mechanisms 8, 9 that transmit in only one direction are provided in the same operation direction, and via both rotation transmitting mechanisms 8, 9, Disk-shaped rotating object 10
Is installed. The rotation transmission mechanisms 8 and 9 include, for example, an inner ring and an outer ring with springs and balls interposed therebetween, or a ratchet between both, so-called transmission in only one direction. Can be used. The rotating members 6 and 7 are provided with holding rods 11 and 12 extending in the radial direction. The holding rod 11 of the rotating member 6 on the movable piece 4 side has an intermediate portion engaged with an engaging portion 13 provided on the movable piece 4, whereby one rotating member 6 and the movable piece 4 are integrally formed. It is in a state of reciprocating rotation. In this embodiment, the motor housing H is provided with a pin 14.
Arm 15 rotatably mounted at the center via
The ends of the holding rods 11 and 12 are respectively connected to both ends of the rotating member 6, whereby the rotating members 6 and 7 are connected by the holding rods 11 and 12 and the joint arm 15 so as to rotate in opposite directions. It is. As shown in FIG. 4, the joint arm 15 has a long hole at the insertion portion of each of the holding rods 11, 12, and swings with the rotation of the rotating members 6, 7 in directions opposite to each other. . In the electric motor 1 having the above configuration, when one of the magnetic poles A is excited by energization, one of the bent portions 4
In this state, a and 4b are sucked (the state shown by the solid line in FIG. 2). Next, when one magnetic pole A is demagnetized and the other magnetic pole B is energized by energization, the bending portion 4c, 4d of the other pair of the movable piece 4 is formed.
Is sucked, and the movable piece 4 reciprocates as shown by a virtual line in FIG. In this forward movement process, one rotating member 6 rotates together with the movable piece 4, and the other rotating member 7 rotates in the opposite direction to the movable piece 4 by the holding rods 11 and 12 and the joint arm 15. At this time, since the operation directions of the rotation transmission mechanisms 8 and 9 are the same, one of the rotation members 6 is
And the other rotating member 7 is rotated
It is in a state to transmit to 10. This allows the rotating object
10 rotates together with the other rotating member 7 by an angle θ corresponding to the phase of the magnetic poles A and B so as to reach the state of FIG. 3 to FIG. Further, when the other magnetic pole B is demagnetized and the one magnetic pole A is excited again to move the movable piece 4 backward, the one rotating member 6 rotating together with the movable piece 4 is transmitted to the rotating body 10. Then, the other rotating member 7 idles with respect to the rotating body 10. That is, as described above, the other rotating member 7 is integrated with the rotated body 10 during the forward movement, and the one rotating member 6 is integrated with the rotated body 10 during the backward movement. The other rotating member 7 and the rotating direction of one rotating member 6 at the time of the backward movement are all the same direction. Thereby, the rotating body 10 further rotates by the angle θ so as to reach the state of FIG. 5 from FIG. In this way, the electric motor 1 has two-phase magnetic poles A,
B is alternately excited to cause the movable piece 4 to reciprocate and rotate, so that one rotating member 6 engaged with the movable piece 4
The other rotating member 7, which is connected by the holding rods 11, 12 and the joint arm 15 so as to be reversely rotated with respect to the one rotating member 6, alternately repeatedly transmits and idles to the rotating body 10, and The rotating body 10 rotates in one direction. Further, the electric motor 1 includes a rotating body 10 serving as an output unit.
Even if a load torque in the reverse direction is applied to the motor, the reverse rotation is completely prevented by the rotation transmitting mechanisms 8 and 9 that transmit power in only one direction, and this function can be ensured regardless of whether power is supplied. Note that the electric motor according to the present invention is not limited to the configuration of the above-described embodiment. For example, a rotating body used as an output unit may be configured by a gear, a cam, or the like.

[Effect of the invention]

As described above, according to the electric motor of the present invention, a movable piece that reciprocates by providing magnetic poles of each phase alternately is provided on the shaft of a stator having two-phase magnetic poles. Two rotating members are rotatably mounted side by side in the axial direction on the shaft of the stator, and individual rotation transmitting mechanisms for transmitting in only one direction are provided on the outer periphery of each rotating member in the same operation direction, and both rotating members are provided. The rotating body is mounted via a rotation transmission mechanism, and both rotating members are provided with holding rods extending in the radial direction thereof, and the center of the joint arm is rotatably mounted on the motor housing via a pin, The ends of the holding rods are respectively connected to both ends of the joint arm, and both rotating members are connected to rotate in opposite directions by the holding rods and the joint arm, and one holding rod is provided on the movable piece. Engage part Since the one rotating member and the movable piece are reciprocally rotated integrally, the driven body can be rotated in one direction each time the movable piece is reciprocated and moved back. A mechanical blocking function can be ensured, and it is extremely suitable as a drive source for a device that is expected to have a large load torque in the reverse direction. In addition, the structure is simple, so the size and cost can be reduced. Can be realized.

[Brief description of the drawings]

1 is a sectional view illustrating an electric motor according to an embodiment of the present invention, FIG. 2 is a bottom view illustrating a stator and a movable piece, FIG. 3 is a plan view of the electric motor, and FIG. 5 and 6 are plan views each illustrating a state in which the rotating body is rotating. DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Stator, 3 ... Shaft, 4 ... Movable piece, 6
... one rotating member, 7 ... the other rotating member, 8,9 ... rotation transmission mechanism, 10 ... rotated body, 11,12 ... holding rod, 13 ... engaging part, 1
4 ... pin, 15 ... joint arm, A, B ... magnetic pole, H ... motor housing.

Claims (1)

(57) [Scope of request for utility model registration] 1. A movable piece reciprocatingly rotating by exciting magnetic poles of each phase alternately is provided on a shaft of a stator having two-phase magnetic poles, and two rotating members are provided on the shaft of the stator. Attached to the outer circumference of each rotating member in the same operating direction, with an individual rotation transmitting mechanism that transmits in only one direction, and attached the rotating body via both rotation transmitting mechanisms The two rotating members are each provided with a holding rod extending in the radial direction, and the center of the joint arm is rotatably mounted on the motor housing via a pin, and the ends of the holding rods are attached to both ends of the joint arm. The two rotating members are connected to each other by the respective holding rods and the joint arms so as to rotate in opposite directions, and one holding rod is engaged with the engaging portion provided on the movable piece to be connected to the other rotating member. Movable piece reciprocates integrally An electric motor, characterized in that the state of.