JPS6223388A - 1-phase semiconductor motor and its starting method - Google Patents

Abstract

PURPOSE:To improve the efficiency by superposing a low frequency signal on a position detection signal of a motor to smoothly start a rotor without raising its cost. CONSTITUTION:When a power source is turned ON, a low frequency oscillation signal from a low frequency oscillator is input to a driving circuit 11 to cause a rotor to start vibrating. The vibration of the rotor at this time is detected by a position detector, which outputs a position detection signal. When the level of the position detection signal becomes higher than the oscillation signal, the rotor is mainly controlled by the position detection signal, and starts rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) 2.Objective of the invention a. Industrial field of application The invention of the present application relates to a one-phase semiconductor motor whose position is detected by a coil, and a method for starting the one-phase semiconductor motor. .

b. A conventional one-phase semiconductor motor typically has nine drive coils la, lb, a position detection coil, and two position sensing coils, as shown in FIG. stator yoke 3
．． The motor is composed of a portion of the stator made up of a bearing 4, and a rotor rotatably attached to the bearing 4.The position signal voltage of this electric motor has a relationship between the rotational speed of the rotor and the ratio 9+1 shown in FIG. be.

Therefore, if the rotor is now rotating, a rotor signal will be detected by the 2-position detection coil 2), but it will not be detected in the stopped state, and even if the rotor is energized in this state, it will not start.

Conventionally, in order to solve this problem, a method has been adopted in which the motor is driven 5 steps at startup and then switched to a position signal when one revolution begins to freeze.

Furthermore, in a one-phase electric motor, the torque is small at the switching point of the common pole, making it impossible to start at this point.

Startup is performed by using cogging or special magnetization of the magnet rotor.

However, these known methods inevitably introduce a counter-torque component, which not only significantly reduces the efficiency of the motor, but also complicates the two circuits, increases the number of components, and complicates the installation process, making them unsuitable for mass production. Because of this, the company had the disadvantage that it was difficult to provide at a low price.

(Refer to Japanese Patent Publication No. 50-83 and Japanese Patent Publication No. 54-32121.) C2 Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks of the prior art and provides a one-phase system for position detection using a coil. To provide a starting method capable of solving the problem that a rotor signal of υ is not detected by a position detection coil during rotation stop in a one-phase semiconductor motor using a semiconductor motor and a known position detection sensor, and therefore automatic operation is difficult. In this way, it is possible to provide a semiconductor motor that can be started completely and the efficiency can be completely increased without increasing costs.

(b) Structure of the 2nd Invention A2 Means for Solving Problems Function The feature of the present invention is that 9 Before the position detection signal is outputted, a low frequency oscillator signal is outputted and inputted to the drive circuit, causing vibration of the rotor. The vibration of the rotor generates a position detection signal,
By rotating the rotor, the following features of the present invention are:
Compared to known starting methods, the 9 circuit is simpler, has superior productivity, and can be provided at a lower cost, even compared to methods using cogging or the like.

It can be easily understood that by not introducing counter torque, that is, the lack of torque at the pole switching portion is resolved by the vibration of the two oscillation signals, and the efficiency is greatly improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the accompanying drawings, in which two preferred embodiments of the invention are shown.

The semiconductor motor of the present invention performs the operations described below by connecting the circuit shown in the block diagram shown in FIG. 2 (which adds the oscillation signal of the low frequency oscillator and the position detection signal).

That is, as shown in FIG. 3, when the power is turned on.

A low frequency oscillation signal 5 is output (at this time, the position detection signal 7 is not output).This low frequency oscillation signal 5 is input to the drive circuit 11, and part 9 of the energization signal 8 is applied to the drive coils la and lb. (Figure 1).

At this time, rotor 6 begins to vibrate like part 9.

The vibrations of the rotor generate a position sensing signal 7.

When the level of this position detection signal 7 becomes higher than the level of the low frequency oscillation signal 5, the energization to the rotor 6 becomes close to the second position detection signal 7, and the rotor is activated by the low frequency oscillation signal 5 and the position detection signal 7. Start rotating.

When the above rotation starts, the position detection signal 7 becomes large.
The low frequency oscillation signal 5 becomes almost irrelevant to tl like the 10th part. Therefore, the rotor will now perform a predetermined rotation based on the position detection signal 7.

Another Embodiment The above starting method of the present invention vibrates the rotor and
Since it is a method of position detection, the electric motor can be 2-phase, 3-phase, or
...Even if it is N-phase.

If 9 circuits of the present invention are attached to one phase of N-phase Φ.

Can be started.

It is also possible to rotate the drive coil for position detection using the back electromotive force of the drive coil.

(C) 5 Effects of the Invention As explained above, the invention of the present application can easily output the position detection signal of a 1-phase semiconductor motor in a stopped state of 2 rotations using a circuit that is simpler than the circuit using the conventional method. Shit
The rotor can be started smoothly, and at the same time, output torque ripple can be eliminated and the efficiency of the two generators can be increased.

Also, when installed in high temperature European locations, etc.

Because it is not possible to use semiconductors such as Hall elements, 9
For example, this is a particularly effective means for fan motors used in warm air circulation type kotatsu.

Furthermore, since the structure is simple, it is suitable for mass production, and can be provided at low cost.This invention has many industrial effects.

[Brief explanation of the drawing]

In the accompanying drawings showing the embodiment, Fig. 1 is a front explanatory view of the armature, Fig. 2 is a diagram of the power supply control system, and Fig. 3 is a waveform diagram of each part of current and voltage. Explanation of symbols la, 1biIitK moving coil 2; position detection coil 3; stator yoke 4; bearing 5
;Low frequency oscillation signal 6;Rotor 7;
Position detection signal 8; Energization signal 9; Waveform 9
Part 10; Waveform 10 Part 11; Drive circuit Fig. 1 Fig. 2! 11

Claims (2)

[Claims] (1) In a one-phase semiconductor motor that detects the position using a coil and a one-phase semiconductor motor that uses a known position detection sensor, a low-frequency signal is superimposed on the motor position detection signal, and when the motor is stopped, A one-phase device characterized in that it is started by vibrating with a low frequency oscillation signal and rotates, so that the position detection signal becomes larger than the oscillation signal level, and when rotating, it is energized by the position detection signal. semiconductor electric motor. (2) A low-frequency oscillation signal is superimposed on the position detection signal of the motor, and when the motor is stopped, it is vibrated with the low-frequency oscillation signal, and then started and rotated, so that the position detection signal becomes higher than the oscillation signal level. A method for starting a semiconductor motor, characterized in that during rotation, electricity is supplied according to a position signal.