CN2916638Y

CN2916638Y - Rotating speed detecting circuit device for AC fan motor

Info

Publication number: CN2916638Y
Application number: CN 200620121203
Authority: CN
Inventors: 陈建荣; 刘智光; 蔡子文
Original assignee: Yen Sun Technology Corp
Current assignee: Yen Sun Technology Corp
Priority date: 2006-06-13
Filing date: 2006-06-13
Publication date: 2007-06-27
Anticipated expiration: 2016-06-13

Abstract

The utility model relates to a rotary speed testing circuit device of AC fan motor. The AC fan motor mainly comprises a stator and a rotor driven by the stator. The rotary speed testing circuit device comprises a magnetic component on the rotor, a sensing component used for sensing the magnetic component, and a driving unit forming electric connection with the sensing component. The driving unit is provided with a switch crystal tube, a first resistance, and a second resistance. When the rotor is rotating, the sensing component can sense the frequency of the magnetic component in the sensing area and send a driving signal. By resorting to the voltage bias of the first resistance and the second resistance, the driving unit amplifies the driving signal to make the switch crystal tube able to send a corresponding rotary speed checking signal to test the operation of the rotor.

Description

The speed detect circuit device of ac fan motor

Technical field

The utility model relates to a kind of speed detect circuit device, particularly relates to a kind of speed detect circuit device of ac fan motor.

Technical background

Consult Fig. 1, general ac motor rotation speed control circuit 1 includes an AC power 11, an integrated circuit component 12, a motor 13, a thyristor 14, two variable resistors 15, and a shaft encoder 16.

This integrated circuit component 12 mainly is to utilize pin 1,14 to be electrically connected to respectively on this

motor

13,4 of pins are electrically connected on the grid of this thyristor 14, pin 7 is electrically connected on this shaft encoder 16, pin 10 is electrically connected on this two

variable resistor

15, and 15 of this two variable resistors are in order to regulate the reference voltage level of this integrated circuit component 12.

16 of this shaft encoders are connected with to this motor 13, to detect the rotating speed of this motor 13, and its result transferred on this integrated circuit component 12 with a frequency signal, this integrated circuit component 12 is converted to voltage signal with this frequency signal, and compare with the reference voltage level that this two variable resistor 15 is imported, and send corresponding signal and adjust the rotating speed of this motor 13, so as to reaching the purpose of these motor 13 rotating speeds of control.

Yet above-mentioned design, but because the pin connected mode of this integrated circuit component 12 is comparatively complicated, and the cost of parts of this integrated circuit component 12 itself is also higher, if only need judge the operating condition of this motor 13, and do not need to control the function of these motor 13 rotating speeds, it is comparatively complicated that this kind design just seems, and have also that winding efficient is lower, cost is than problems such as height.

The utility model content

The purpose of this utility model is to provide a kind of speed detect circuit device of ac fan motor, not only can detect the operational situation of this ac fan motor simply, and has advantages such as winding is convenient, cost is lower.

For achieving the above object, the speed detect circuit device of the utility model ac fan motor, this ac fan motor adds the AC power driven in rotation by one, and it consists predominantly of a stator, and one can be driven the induction rotor rotated by stator.This speed detect circuit device includes one and is arranged at this epitrochanterian magnetic element, a sensing element in order to this magnetic element of induction detecting, and a driver element that is electrically connected with this sensing element formation.This driver element has a switching transistor, one first resistance, and one second resistance, this switching transistor has a base stage that can be triggered, and both can be an emitter and a collector of conducting state when this switching transistor is triggered, this first resistance be the position between this sensing element and base stage, this second resistance be the position between this base stage and collector.

Effect of the present utility model is, when this rotor rotation, this sensing element can be responded to the frequency of this magnetic element of detecting by its sensing region, and corresponding output one drive signal, the bias voltage that this driver element then forms by this first resistance and second resistance, this drive signal is amplified, and make this switching transistor export a corresponding rotary speed detecting signal, so as to detecting the operational situation of this rotor.

Description of drawings

Fig. 1 is a circuit diagram, and general ac motor rotation speed control circuit is described;

Fig. 2 is a side view cutaway drawing, and the preferred embodiment of the speed detect circuit device of the utility model ac fan motor is described;

Fig. 3 is a circuit diagram, and the connection status of a sensing element and a driver element is described in the preferred embodiment;

Fig. 4 is a waveform synoptic diagram, illustrates under the situation of the mutual induction of single sensing element and single magnetic element, from the measured waveform of FG end;

Fig. 5 is a waveform synoptic diagram, illustrates under the situation of single sensing element and two mutual inductions of magnetic element, from the measured waveform of FG end;

Embodiment

Be elaborated below by preferred embodiment and accompanying drawing speed detect circuit device to the utility model ac fan motor.

Consult Fig. 2, the preferred embodiment of the speed detect circuit device 3 of the utility model ac fan motor 2, this ac fan motor 2 is to add AC power (not shown) driven in rotation by one, and it consists predominantly of a stator 21, and one can be driven induction rotor rotated 22 by stator 21.This stator 21 has a support body 211, an and coil 212 that is wound on this support body 211,22 of this rotors have the rotor 222 that a wheel hub 221, is located at these wheel hub 221 inside, an and siliconized plate group 223 of being located on this rotor 222, after the coil 212 of this stator 21 feeds electric current generation magnetic field, just can produce the effect that magnetic is repelled each other with the siliconized plate group 223 of this rotor 22, and then this rotor 222 and wheel hub 221 are rotated.

Consult Fig. 2,3 in the lump, this speed detect circuit device 3 includes magnetic element 31, the sensing element 32 in order to this magnetic element 31 of induction detecting that is arranged on the rotor 222 of this rotor 22, reach a driver element 33 that is electrically connected with these sensing element 32 formation, this driver element 33 and sensing element 32 all are arranged on the circuit board 330 that combines with the support body 211 of this stator 21, and this driver element 33, sensing element 32 and circuit board 330 threes' electric connection mode, can be the people who is familiar with circuit engineering and finish easily, so repeat no more in this.

This sensing element 32 can be responded to the frequency of this magnetic element 31 of detecting by its sensing region, and correspondence is exported a drive signal according to its frequency, and in the present embodiment, this magnetic element 31 is a permanent magnet, and 32 of this sensing elements are a Hall element.

This driver element 33 has a switching transistor 331, one first resistance 332, and one second resistance 333, this switching transistor 331 has a base stage that can be triggered 334, and both can be an emitter 335 and a collector 336 of conducting state when this switching transistor 331 is triggered, this first resistance 332 be the position between this sensing element 32 and base stage 334, this second resistance 333 is between this base stage 334 and collector 336.

By above-mentioned design, the bias voltage that this driver element 33 just can utilize this first resistance 332 and second resistance 333 to form, and the drive signal that this sensing element 32 is exported is amplified, this switching transistor 331 is switched between a state of saturation and a cut-off state, and make this switching transistor 331 export a corresponding rotary speed detecting signal from this emitter 335.

Consult Fig. 2,3,4, when the rotor 22 of this ac fan motor 2 rotates, the magnetic element 31 that is arranged on the rotor 222 of this rotor 22 also can be with respect to place, the axle center rotation of this rotor 222, and this magnetic element 31 whenever revolves in the time T that turns around, having this sensing element 32 of one t1 period does not detect this magnetic element 31 and is positioned at its sensing region, so at this t1 in the time, this sensing element 32 is output drive signal not, 334 of the base stages of this switching transistor 331 are not triggered and make between its emitter 335 and the collector 336 is to be in the cut-off state that opens circuit, therefore in the measured rotary speed detecting signal of the emitter 335 (FG end just) of this switching transistor 331, can form shown in Fig. 4, t1 is in high level current potential (High).

On the contrary, whenever revolve in the time T that turns around at this magnetic element 31, having this sensing element 32 of one t2 period is to detect this magnetic element 31 to be positioned at its sensing region, so this t2 is in the time, this sensing element 32 can be exported the base stage 334 of this drive signal to this switching transistor 331 accordingly, this switching transistor 331 is triggered and makes and be in the short circuit state of saturation between its emitter 335 and the collector 336, this is engraved in the measured rotary speed detecting signal of the emitter 335 (just FG end) of this switching transistor 331, just can form as shown in Figure 4, t2 is in low level current potential (Low).

As shown in the above description, when on the rotor 222 of this rotor 22 single magnetic element 31 only being set, just can be in the time T of the moving circle of these rotor 22 revolutions, produce the rotary speed detecting signal (each of high level current potential and low level current potential) of a square wave, reach whereby and detect the purpose whether this rotor 22 runs well.

In the present embodiment, it is the aspect of exposing single magnetic element 31, another magnetic element 31 can certainly additionally be set again, and under the situation that two magnetic elements 31 are arranged, when this magnetic element 31 whenever revolves in the time T that turns around, this sensing element 32 detects the frequency of magnetic element 31 by its sensing region just can improve (because magnetic element 31 numbers increase), this rotary speed detecting signal just can be as shown in Figure 5, produce two square-wave waveforms (each two of high level current potential and low level current potentials), and this kind design to be the people who is familiar with this technology understand easily, so should not be limited to the explanation of present embodiment to magnetic element 31 numbers.

Conclude above-mentioned, the utility model is by the frequency of these sensing element 32 these magnetic elements 31 of induction detecting by its sensing region, and according to its frequency corresponding this drive signal of output, the switching transistor 331 of this driver element 33 then is converted to this drive signal the rotary speed detecting signal of square-wave form, and then reaches the purpose that detects these rotor 22 operational situations.Moreover, compared to general ac motor rotation speed control circuit 1, carrying out circuit by this integrated circuit component 12 connects, not only very the cost of complexity but also this integrated circuit component 12 is higher, review the induction detecting function that the utility model only need utilize this magnetic element 31 and sensing element 32 simply, the arrange in pairs or groups in good time triggering and conducting of this switching transistor 331, just can judge the operating condition of this rotor 22, in design, seem comparatively succinctly convenient, and this magnetic element 31, sensing element 32, and switching transistor 331 threes' material cost is lower, so can reach the purpose of this utility model really.

Claims

1, a kind of speed detect circuit device of ac fan motor, this ac fan motor are by adding the AC power driven in rotation, and it consists predominantly of stator, and can be driven the induction rotor rotated by stator, it is characterized in that:

This speed detect circuit device includes the sensing element that is arranged at this epitrochanterian magnetic element, detects this magnetic element in order to induction, and the driver element that is electrically connected with this sensing element formation, this driver element has switching transistor, first resistance, and second resistance, this switching transistor has the base stage that can be triggered, and both can be the emitter and the collector of conducting state when this switching transistor is triggered, this first resistance be the position between this sensing element and base stage, this second resistance be the position between this base stage and collector.

2, the speed detect circuit device of ac fan motor as claimed in claim 1 is characterized in that:

This magnetic element is a permanent magnet.

3, the speed detect circuit device of ac fan motor as claimed in claim 1 is characterized in that:

This sensing element is a Hall element.