JPS63213462A - Motor - Google Patents

Abstract

PURPOSE:To simplify a driving circuit, by arranging first and second armatures generating magnetic poles at positions with specified electrical angle phase different from that of a stator magnet. CONSTITUTION:A rotor 10 consists of a permanent magnet having an N pole 11 and an S pole 12, and a stator magnet 40 is provided with an N pole 41 at the electrical angles of 0 deg.-180 deg. and an S pole 42 at the electrical angles of 180 deg.-360 deg.. From a first armature 50, a magnetic pole with electrical angle phase different from that of the stator magnet 40 by +150 deg. is generated, and from a second armature 60, a magnetic pole with electrical angle phase different from that of the stator magnet 40 by -150 deg. is generated. The first and second armatures 50, 60 of the stator magnet 40 are integrated with each other to compose a stator 30. Hence, electrical conduction to the first and second armatures 50, 60 only has to be controlled requiring only two switching elements Q1, Q2, and the whole composition can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motor that is inexpensive and has a simple drive circuit.

[Conventional technology]

Synchronous motors have recently been widely used in information processing peripherals as step motors or brushless motors. A synchronous motor consists of a stator (armature) with windings and a rotor with magnetic poles made of permanent magnets.Brushless motors detect the rotation angle and switch the energization of the stator windings. A DC motor is a type of motor in which the energization is sequentially switched in accordance with an externally applied electric signal, and the rotor advances in accordance with the electric signal, which is called a step motor.

Step motors are often used for positioning the heads of information devices because they can be positioned at low cost. An example is shown in FIG.

FIG. 5 is an exploded view of a two-phase step motor, which is the cheapest among step motors. In this figure, 1° is the rotor and N
It consists of a pair of magnetic poles: pole 11 and north pole 12. A stator 20 has windings 21, 22, 23, and 24. One end of each winding is connected to the power supply +vce, and the other end is connected to the collectors of the switching transistors Q1 to Q4. The emitter of each transistor Q1 to Q4 is grounded,
A, B, A, B signals are added to each base.

Rotational motion is obtained by energizing signals A, B, τ, and 100 in this order.

[Problem that the invention seeks to solve]

Such a step motor can be manufactured at low cost, but in order to drive it, four switching transistors Ql-Q4 are required, and a logic circuit and logic circuit are required to control the on and off of each. complex,
In addition, there was a problem that the drive circuit was expensive.

The present invention was made to solve the above problems, and an object of the present invention is to provide a motor whose drive circuit can be easily configured.

[Means for solving problems]

The motor according to the present invention includes a rotor having a plurality of magnetic poles; a stator magnet provided at the same pitch as the rotor; and a first stator magnet that generates magnetic poles at different positions in the electrical angle gold phase from the stator magnet. It consists of an armature and a second stator that generates magnetic poles having an electrical angle phase different from that of the stator magnet by -A°, where A is 90 or more and 180 or less.

(Function) In this invention, 1. When the second armature is not energized, torque is generated by the stator magnet, and the first armature is energized. Continuous driving is achieved by the combined torque with the torque generated by energizing the second armature.

〔Example〕

FIG. 1 is a developed view showing an embodiment of the present invention. In this figure, the rotor 10 is made of a permanent magnet having a north pole 11 and a south pole 12, and is the same as that shown in FIG. 40 is a stator magnet, which is equipped with an N pole 41 ranging from 06 to 180'' electrical angle and a S pole 42 ranging from 180° to 360° electrical angle. 50 is a first stator magnet.
The armature generates a magnetic pole having an electrical angle phase different from that of the stator magnet 4o by +150°. A second armature 60 generates magnetic poles having an electrical angle phase different from that of the stator magnet 40 by 1150 degrees. In addition, 50W and SOW are the first and second armatures 5.
0.60 winding is shown. Then, the stator magnet 4o and the first. The second armature 50.60 is integrated with the stator 3
It constitutes 0. Further, Qr and Q2 are transistors and A.

B indicates the applied signal. Note that a control portion for controlling energization to Qs and Q2 is not shown.

Next, the operation will be explained using the torque curve shown in FIG.

1st. Winding 50W of second armature 50.60.

When 60 W is not energized, only the torque is generated by the stator magnet 40, and the torque curve is as shown by curve C in FIG. 2, with a stable point at a rotation angle of 180° electrical angle. Next, when the winding 50W of the first armature 50 is energized,
The torque curve due to each magnetic pole 11, 12 of the rotor 10 and the magnetic pole of the first armature 50 is as shown in curve a in FIG. 2, and the combination of this and torque curve C is as shown in curve a+C, It is possible to obtain torque characteristics with a 120° electrical angle phase shift with respect to curve C. Then, the first armature 50 and the rotor 10 are
The magnitude of the torque (curve a) due to this is set to be twice the magnitude of the torque (curve C) when no current is applied.

Similarly, when the winding SOW of the second armature 6o is energized, the torque characteristic shown by the curve is obtained. Therefore, a composite torque as shown by curve b+c which is out of electrical angle phase by 1120 degrees with respect to the torque when no current is applied (curve C) is obtained.

Continuous motion can be obtained by repeating the steps of energizing the first armature 50, energizing the second armature 60, and de-energizing, and the repeating order can be reversed. You can get motion in the opposite direction.

FIG. 3 is a torque diagram showing another embodiment of the present invention.

Torque (a) whose phase is ±135° electrical angle different from torque (C) generated by stator magnet 40 and whose magnitude is 32 times.

Two armatures 50° and 60 are provided so as to generate (b). In this way, the composite torque a+c, a+b+
c, b+c draw curves with different phases of 90 degrees each along with the torque (C) of the non-energized garment, and continuous motion can be obtained by sequentially energizing these curves.

FIG. 4(a) is a partially cutaway perspective view of an embodiment of the present invention, and FIG. 4(b) shows details of the tooth portion of FIG. 4(a). In this example, a multi-pole magnetized rotor 1o; stator magnets 40. This stator magnet 40 and 150°
A first armature 5o and stator magnets 40 and -15 are arranged to generate magnetic poles at positions with different electrical angle phases.
It consists of a stator 3o having a second armature 60 disposed so as to generate magnetic poles at positions with different electrical angle phases of 0°, and energization and non-energization of each armature 50 and 60 are controlled. Rotational motion can be obtained by performing this sequentially.

(Effects of the Invention) As explained above, the present invention includes a rotor having a plurality of magnetic poles; a stator magnet provided at the same pitch as the rotor; and magnetic poles located at positions different in electrical angle phase from the stator magnet by +A°. a stator having a first armature that generates magnetic poles, and a second armature that generates magnetic poles that have a different electrical angle phase from the stator magnet; Since it is driven by sequentially switching between energization and de-energization, it is only necessary to control energization to the first armature and the second armature, so two switching elements are required, and the overall configuration is simplified. It can be simplified. In addition, in conventional step motors, the motor shaft rotates freely when the power is cut off, and in some cases a stopper or the like is installed to prevent this, but with this invention, even if the power is cut off, the stator permanent magnet maintains the torque. occurs, so no special locking mechanism is required.

As described above, according to the present invention, it is possible to obtain a motor that can perform positioning at low cost with a simple configuration, and can be used for magnetic disk drives,
Computer peripherals such as printers.

It has the advantage of reducing the cost of office equipment.

[Brief explanation of the drawing]

FIG. 1 is a developed diagram showing an embodiment of the present invention, FIGS. 2 and 3 are torque characteristic diagrams for explaining the operation of the present invention,
FIG. 4(a) is a partially cutaway perspective view of an embodiment of the present invention, FIG. 4(b) is a detailed view of the tooth portion of FIG. 4(a), and FIG. 5 is a conventional FIG. In the figure, 10 is the rotor, 30 is the stator, 40 is the stator magnet, 50 is the first armature, 50W is the winding, 6o is the second
armature, 60W is winding, Q++ Fig. 1 Ql, Q2: h transistor Fig. 4 Fig. 5

Claims (3)

[Claims] (1) A rotor having a plurality of magnetic poles; a stator magnet provided at the same pitch as the rotor; and a first rotor that generates magnetic poles at a position different in electrical angle phase by +A° from the stator magnet.
and a second stator that generates magnetic poles having an electrical angle phase different from that of the stator magnet by -A°, and is driven by sequentially switching energization/de-energization to each of the armatures. A motor characterized by: However, A shall be 90 or more and 180 or less. (2) A is 150, and the device is driven by sequentially repeating three steps: no energization, energization to the first armature, and energization to the second armature. The motor described in paragraph (1). (3) When A is 135 and by sequentially repeating the four steps of de-energizing, energizing the first armature, energizing the first and second armatures, and energizing the second armature. The motor according to claim (1), characterized in that it is driven.