JP2547063Y2 - Fan motor control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor control device, and more particularly to a fan motor control device driven by a three-phase brushless motor and having a rotation detection circuit.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing a configuration of a conventional fan motor control device driven by a three-phase brushless motor. Is a three-phase pre-driver circuit, 3 is a power amplifier, 4 is a motor, 5 is a fan, 6 is an operational amplifier, 7 is a transistor, and 8 is an output terminal of a rotation detection signal. The fan motor control device shown in the drawing converts the rotor position signal generated by the plurality of Hall detectors 1 into a three-phase 120-degree energization signal using a two-phase three-phase pre-driver circuit.
A circuit for converting the electric power into electric power capable of driving the motor 4 and supplying the electric power to the motor 4 to rotationally drive the fan 5 fixed to the motor;
The signal from the Hall detector 1 is input to an operational amplifier 6 to be shaped into a rectangular wave, and a pulse signal proportional to the number of rotations is output from an output terminal 8 via a transistor 7 to be used for motor speed control, rotation abnormality detection, and the like. And a rotation detection circuit that performs the rotation.

[0003]

However, in the conventional fan motor control device shown in FIG. 3, the output terminal of the Hall detector 1 is connected in parallel to the pre-driver circuit 2 and the operational amplifier 6 of the rotation detection circuit. Since the connection is made, noise may be included at the time of starting or restraining the fan, and the rotation detecting circuit including the operational amplifier 6 and the pre-driver circuit 2 malfunction, and the motor cannot be started. An object of the present invention is to provide a fan motor control device including a rotation detection circuit and a rotation detection circuit that does not generate noise in a pre-driver circuit.

[0004]

In the present invention, the object is achieved by stopping the configuration in which the rotation detection signal is obtained from the Hall detector and obtaining the rotation detection signal from the output side of the pre-driver circuit.

[0005]

In the configuration of the present invention, the configuration in which the rotation detection signal is obtained from the Hall detector is stopped and the configuration is obtained from the output side of the pre-driver circuit, so that the load on the Hall detector is reduced and the output voltage is reduced. As a result, the S / N ratio is improved, and there is an effect that the malfunction of the rotation detection circuit and the pre-driver circuit can be prevented.

[0006]

FIG. 1 is a circuit diagram of a fan motor control device embodying the present invention. The components 1 to 5 are the same as those of the prior art shown in FIG. A new configuration is that the input side of the OR circuit 10 is connected to the output terminals W and X of the second circuit 2 and the output of the OR circuit 10 is connected to the output terminal 12 via the transistor 11.

That is, in the prior art shown in FIG.
The operational amplifier 6 for extracting the rotation detection signal is connected to the Hall detector 1
In the present invention, the rotation detection signal is taken out from the output terminal of the pre-driver circuit.

As a result, the load on the hole detector 1 is reduced, and the output voltage is increased, so that the input voltage of the pre-driver circuit 2 is increased, the S / N ratio is improved, and the output of the pre-driver circuit 2 is increased. Even if the OR circuit 10 is connected, the load does not increase, so that malfunction of the rotation detection circuit and the pre-driver circuit can be prevented.

FIG. 2 illustrates the operation of the control device of the present invention.
(Pre-driver circuit 2 and rotation detection output terminal 12) is a timing chart showing output voltages of the first set of U, V,
W is an energization signal having an energization angle of 120 degrees, and a second set of X, Y,
Z is an energization signal having a phase of 180 degrees with each of the U, V, and W signals. The motor 4 is driven via the power amplifier 3 by the two sets of energization signals.
The operation is performed such that a rotation detection signal of 180-degree conduction is obtained by synthesizing by the R circuit 10.

In FIG. 2, hatching is written on the W signal and the X signal. While both the W signal and the X signal are at the H level, the output terminal 12 is at the L level, and the angle is 180 degrees. , A rotation detection signal of 180-degree conduction is obtained from the output terminal 12.

[0011]

Since the fan motor control device according to the present invention has the above-described structure, the load on the hole detector is reduced to increase the S / N ratio, and the fan motor is rotated from the output terminal of the pre-driver circuit. Since the detection signal is obtained, the malfunction of the rotation detector and the pre-driver circuit can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a fan motor control device according to the present invention.

FIG. 2 is a timing chart illustrating the operation of the fan motor control device according to the present invention.

FIG. 3 is a circuit diagram of a conventional fan motor control device.

[Explanation of symbols]

 1: Hall detector 2: Predriver circuit 3: Power amplifier 4: Motor 5: Fan 6: Operational amplifier 7, 11: Transistor 10: OR circuit 8, 12: Output terminal of rotation detector

Claims (1)

(57) [Scope of request for utility model registration] 1. A stator having three-phase windings, a rotatably supported rotor, a fan formed integrally with the rotor, and a hole for detecting the position of the rotor. And a power amplifier driven by the output of the pre-driver circuit driven by the output of the Hall detector. , 2 of the outputs of the pre-driver circuit
An apparatus for controlling a fan motor, comprising: an OR circuit that converts an output of two phases into a rotation detection signal having a conduction angle of 180 degrees.