JPH0515697U - Fan motor controller - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a stator having a three-phase winding, a rotor rotatably supported, a fan fixed to the rotor, and a hole for detecting the position of the rotor. In a fan motor control device for sequentially energizing three-phase windings by a detector and a power amplifier driven by the output of a pre-driver circuit driven by the output of the Hall detector to drive the rotor in rotation, A fan motor control device that has a rotation detector that detects the rotation speed of the rotor from the output of the hall detector and that does not cause malfunctions such as inability to start due to noise when the fan is started or restrained. The purpose is to obtain. According to the present invention, the object of achieving the object is achieved by stopping the structure for obtaining the signal of the rotation detector from the hall detector and obtaining the rotation detection signal from the outputs of the output terminals W and X of the pre-driver circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 having a rotation detection circuit.

[0002]

[Prior Art]

 Fig. 3 is a circuit diagram showing the configuration of a fan motor control device driven by a three-phase brushless motor that has been conventionally used. 1 is a Hall detector for detecting the rotor position, and 2 is a 3-phase A 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 controller shown in the figure converts the rotor position signals generated from a plurality of Hall detectors 1 into a three-phase 120-degree conduction signal by a two-phase three-phase pre-driver circuit, and a power amplifier 3 drives the motor 4 to drive the motor 4. A circuit that converts the electric power into a power that can be driven and supplies the electric power to the motor 4, and rotationally drives the fan 5 that is fixed to the motor. The output terminal 8 outputs a pulse signal in proportion to the rotation speed, and the rotation detection circuit is used for speed control of the motor, rotation abnormality detection, and the like.

[0003]

[Problems to be solved by the device]

 However, in the conventional fan motor control device shown in FIG. 3, the output terminal of the hole detector 1 is connected in parallel to the pre-driver circuit 2 and the operational amplifier 6 of the rotation detection circuit. When starting or restraining, noise may be included, and the rotation detection circuit including the operational amplifier 6 and the pre-driver circuit 2 malfunction, causing a problem that the motor cannot be started. An object of the present invention is to obtain a fan motor control device provided with a rotation detection circuit that does not generate noise in the rotation detection circuit and the pre-driver circuit.

[0004]

In the present invention, the object is achieved by stopping the structure in which the rotation detection signal is obtained from the Hall detector and obtaining it from the output side of the predriver circuit.

[0005]

[Action]

 In the configuration of the present invention, the rotation detection signal is not obtained from the hall detector but 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 becomes high. The / N ratio is improved, and the rotation detection circuit and the pre-driver circuit can be prevented from malfunctioning.

[0006]

【Example】

 FIG. 1 is a circuit diagram of a fan motor control device embodying the present invention. Since the components 1 to 5 are the same as those in FIG. 3 of the prior art, the description thereof is omitted and the output of the pre-driver circuit 2 is omitted. The input side of the OR circuit 10 is connected to the terminals W and X, and the output of the OR circuit 10 is connected to the output terminal 12 via the transistor 11, which is a new configuration.

That is, in the prior art shown in FIG. 3, the operational amplifier 6 for extracting the rotation detection signal is stopped from being connected in parallel to the hall detector 1, and in the present invention, the rotation is performed from the output terminal of the pre-driver circuit. It was configured to take out the detection signal.

As a result, the load on the Hall detector 1 is reduced, the output voltage is increased, 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. Since the load does not increase even if the OR circuit 10 is connected, malfunction of the rotation detection circuit and the pre-driver circuit can be prevented.

FIG. 2 is a timing chart showing the output voltage of the pre-driver circuit 2 and the rotation detection output terminal 12 for explaining the operation of the control device of the present invention. The first set of U, V and W are conduction angles. The energization signal of 120 degrees, and the second set of X, Y and Z are energization signals having a phase of 180 degrees with the U, V and W signals, respectively. The motor 4 is driven, and the W signal and the X signal are combined by the OR circuit 10 to operate so as to obtain a rotation detection signal of 180-degree conduction.

In FIG. 2, the W signal and the X signal are hatched, but 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. From the output terminal 12, a rotation detection signal of 180-degree conduction is obtained.

[0011]

[Effect of the device]

 Since the fan motor control device according to the present invention is configured as described above, the load on the Hall detector is reduced to increase the S / N ratio, and the rotation detection signal is obtained from the output terminal of the pre-driver circuit. Therefore, there is an effect that the malfunction of the rotation detector and the pre-driver circuit can be prevented.

[Brief description of drawings]

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

FIG. 2 is a timing chart for explaining the operation of the fan motor controller according to the present invention.

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

[Explanation of symbols]

 1: Hall detector 2: Pre-driver 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)

[Scope of utility model registration request] 1. A stator having three-phase windings, a rotor rotatably supported, a fan integrally formed with the rotor, and a hole for detecting the position of the rotor. In a controller for a fan motor, which includes a detector and drives a rotor in a rotating manner by sequentially energizing three-phase windings by a power amplifier driven by the output of a pre-driver circuit driven by the output of the Hall detector. , 2 of the outputs of the pre-driver circuit
A fan motor control device comprising an OR circuit for converting an output of one phase into a rotation detection signal having a conduction angle of 180 degrees.