CN207801713U - Self-start permanent-magnet synchronous motor - Google Patents

Abstract

The utility model provides a kind of self-start permanent-magnet synchronous motor, including：One main coiling group and an auxiliary coiling group, wherein one capacitance of auxiliary coiling group series connection；One rotor, the field drives which can be generated by the main coiling group and the auxiliary coiling group, and generate rotation；And a positive warm thermistor, this is just warming quick resistor coupled in parallel in the both ends of the capacitance；The positive temperature thermistor is when the self-start permanent-magnet synchronous motor starting, with the impedance value less than the capacitance, so as to after electric current is passed through via the positive temperature thermistor again by the auxiliary coiling group, to improve the detent torque when self-start permanent-magnet synchronous motor starting.The utility model can be simply by the mode in the positive warm thermistor of both ends parallel connection one for being serially connected with the capacitance of auxiliary coiling group, just can reach improves the detent torque deficiency of self-start permanent-magnet synchronous motor, and the problem of being easy synchronization failure, therefore its simple structure, and effectively reduce cost.

Description

Self-start permanent-magnet synchronous motor

Technical field

The utility model in relation to a kind of self-start permanent-magnet synchronous motor, particularly relate to it is a kind of can improve detent torque from Start permanent magnet synchronous motor.

Background technology

Existing self-start permanent-magnet synchronous motor is a kind of combined type motor, stator structure and alternating current impression motor or friendship The stator structure for flowing syncmotor is identical, but its rotor structure then combines the cage-shaped structure in the rotor of alternating current impression motor, And the permanent magnet structure in the rotor of brushless, permanently syncmotor.Self-start permanent-magnet synchronous motor is to utilize it on startup Cage-shaped structure in rotor generates startup torsion in the induced current that the rotary magnetic place induction generated via stator generates Start, when the rotating speed of its rotor reaches synchronous rotational speed, the induced current on the mouse cage of rotor disappears, rotor no longer by Cage-shaped structure generation torsion, and the rotating excitation field reciprocation caused by the permanent magnet and stator winding on its rotor completely Generate torsion.

Self-start permanent-magnet synchronous motor is better than existing induction motor in terms of efficiency, and cost is cheap compared with brushless, permanently, It is suitble to substitution part induction motor to be applied to the occasion of constant speed.However self-starting permanent magnetism is on startup, have start torque it is relatively low, The problem of leading to difficulty in starting, and synchronizing failure.

In order to overcome the problems referred above, the self-start permanent-magnet synchronous motor of an existing part be by change rotor structure come To the coupling composite magnetic power of bigger, to improve the problem of starting scarce capacity, however the self-start permanent-magnet synchronous horse of this type The rotor reached must use a greater amount of permanent magnets, and must redesign the shape of rotor slot, therefore make its cost substantially It improves.

It due to above, causes existing self-start permanent-magnet synchronous motor that there are disadvantages, and has further improvement Necessity.Therefore how by structure design improvement, to overcome above-mentioned missing, it has also become this cause weight to be solved Want one of project.

Utility model content

The utility model main purpose is to provide a kind of simple structure, and can promote the self-starting permanent magnetism of detent torque Syncmotor.

The utility model embodiment provides a kind of self-start permanent-magnet synchronous motor, including：One main coiling group and one auxiliary around Line group, wherein the auxiliary coiling group one capacitance of series connection；One rotor, the rotor can be produced by the main coiling group and the auxiliary coiling group Raw field drives, and generate rotation；And a positive warm thermistor, this is just warming quick resistor coupled in parallel in the both ends of the capacitance；Its In the positive temperature thermistor when self-start permanent-magnet synchronous motor starting, have less than the capacitance impedance value, so as to making Electric current pass through via the positive temperature thermistor after again by the auxiliary coiling group, to improve the self-start permanent-magnet synchronous motor starting When detent torque.

In one preferred embodiment of the utility model, wherein the rotor is made of cage-shaped structure and permanent magnet structure.

In one preferred embodiment of the utility model, wherein the front side of the capacitance and rear side be respectively provided with one first contact and One second contact, the positive temperature thermistor are electrically connected first contact by one first conducting wire and one second conducting wire and second are connect with this Point.

In one preferred embodiment of the utility model, wherein the positive temperature thermistor is set in a shell, shell tool There are two pin, the positive temperature thermistor and two pin electrical connections, and it is electrically connected first conducting wire by two pins And second conducting wire.

In one preferred embodiment of the utility model, wherein still further comprise a pedestal, which first is led by this Line and second conducting wire are electrically connected first contact and second contact, and two pins of the positive temperature thermistor can be inserted Be placed on the pedestal, and first contact and second contact be electrically connected by the pedestal, and make the positive temperature thermistor with The capacitance is in parallel.

In one preferred embodiment of the utility model, wherein the pedestal is set on the shell of an electrical installation so that should Pedestal is exposed to the outside of the electrical installation.

The beneficial effects of the utility model are can be simply by being serially connected with the both ends of the capacitance of auxiliary coiling group simultaneously The mode of the positive warm thermistor of connection one, just can reach the detent torque deficiency for improving self-start permanent-magnet synchronous motor, and be easy The problem of synchronization failure, therefore its simple structure, and effectively reduce cost.

For the enabled feature and technology contents for also further appreciating that the utility model, please refer to below in connection with the utility model Detailed description and accompanying drawings, however institute's accompanying drawings are only for reference and description, and are not used for limiting the utility model Person.

Description of the drawings

Fig. 1 is the circuit configurations schematic diagram of the self-start permanent-magnet synchronous motor of the utility model first embodiment.

Fig. 2 is that the capacitance that restores after motor starting of the self-start permanent-magnet synchronous motor of the utility model first embodiment divides Circuit configurations schematic diagram under phase formula operating condition.

Fig. 3 is the organigram for the external resistance device that the utility model second embodiment uses.

Fig. 4 is the circuit configurations schematic diagram of the self-start permanent-magnet synchronous motor of the utility model second embodiment.

Specific implementation mode

(first embodiment)

As shown in Figure 1, being a kind of self-start permanent-magnet synchronous motor 1 using the utility model technology, the self-starting permanent magnetism Syncmotor 1 includes the both ends that a main coiling group 20 and one assists coiling group 30, the main coiling group 20 and auxiliary coiling group 30 It is connected respectively with AC power input 40.The self-start permanent-magnet synchronous motor 1 also has a rotor 10, which is by mouse Basket structure and permanent magnet structure are formed, and the rotating excitation field band that can be generated by the main coiling group 20 and auxiliary coiling group 30 Movable property life rotation.

Wherein, auxiliary coiling group 30 is in series with a capacitance 50, passes through the effect of the capacitance 50 so that the self-starting permanent magnetism is same When walking the operating of motor 1, the electric current by the auxiliary coiling group 30 and the electric current by main coiling group 20 generate phase difference, therefore make It obtains the main coiling group 20 and coiling group 30 is assisted to generate the rotating excitation field of two-phase respectively, rotated with driving rotor 10 to generate.

In place of the main improvement of the utility model, it is the just warm of both ends parallel connection one of the capacitance 50 of the auxiliary coiling group 30 Quick resistance 60.As shown in Figure 1, the self-start permanent-magnet synchronous motor 1 of the utility model has respectively in the front side of capacitance 50 and rear side There are one first contact 51 and one second contact 52, and the positive temperature thermistor 60 is electrically connected by the first conducting wire 65 and the second conducting wire 66 It is connected to first contact 51 and second contact 52, so that the positive temperature thermistor 60 and the capacitance 50 are in parallel.

The electrical characteristic of positive temperature thermistor 60 is to have Low ESR under low-temperature condition, and the resistance of the positive temperature thermistor 60 The anti-impedance far below capacitance 50, and short circuit can be considered as, therefore as shown in Figure 1, in the moment of motor starting, electric current will only meeting Via the current path L1 marked in figure, via first conducting wire 65 and the second conducting wire 66 by positive warm thermistor 60 after, Again by assisting coiling group 30, will also make by assisting the electric current of coiling group 30 to be opened without capacitance 50, therefore in motor Dynamic moment by assisting the electric current of coiling group 30 and not will produce phase difference by the electric current of main coiling group 20, and makes It assists coiling group 30 to obtain a high current, the rotor 10 of motor is made to generate larger detent torque, so as to improving self-starting permanent magnetism The problem of startup of syncmotor 1 is not easy.

As shown in Fig. 2, after the self-start permanent-magnet synchronous motor 1 starts, the positive temperature thermistor 60 is because of high current Pass through rear temperature abruptly increase, it will so that resistance increases, therefore can be considered open circuit, and electric current is changed by electric current shown in Fig. 2 Path L2 flow to auxiliary coiling group 30, therefore will be because of the effect of capacitance 50 so that passes through the auxiliary coiling group 30 and master The electric current of coiling group 20 generates phase difference, and the rotating excitation field that the auxiliary coiling group 30 and main coiling group 20 generate is made to have phase Potential difference, and self-start permanent-magnet synchronous motor is made to revert to capacitor split-phase operating.

(second embodiment)

As shown in Figures 3 and 4, it is another alternate embodiment of the utility model, the self-start permanent-magnet synchronous of the embodiment 1 essential structure of motor is identical with first embodiment, therefore repetitive component is not repeated to introduce.The utility model second embodiment In, for the positive temperature thermistor 60 in first embodiment is changed to an external resistance device 60A, as shown in figure 3, the external electricity Hindering device 60A has a shell 61, and shell 61 is internally provided with a positive warm thermistor 62 and two pins 63, this two Pin 63 is set on the shell 61, and is electrically connected the positive temperature thermistor 62.

As shown in figure 4, the self-start permanent-magnet synchronous motor 1 in the embodiment is additionally provided with a pedestal 64, the pedestal 64 is logical It crosses the first conducting wire 65 and the second conducting wire 66 is electrically connected to the first contact 51 and the second contact 52 of 50 both sides of capacitance, and this is external Two pins 63 of resistance device 60A can be assembled on the pedestal 64, when the external resistance device 60A is assembled in the pedestal 64 When upper, which is able to be electrically connected with the first conducting wire 65 and the second conducting wire 66, and passes through the first conducting wire 65 and the Two conducting wires 66 are electrically connected in the first contact 51 and the second contact 52, and make the just warm of the external resistance device 60A quick Resistance 62 is connected to the both ends of the capacitance 50 with parallel way.

The external resistance device 60A of second embodiment is internally provided with positive warm thermistor 62, therefore in the wink of motor starting Between, which still has Low ESR in low-temperature condition, therefore electric current can be allowed to be filled by the outer connecting resistance 60A is set without by capacitance 50 so that by assist coiling group 30 electric current and will not by the electric current of main coiling group 20 Phase difference is generated, and auxiliary coiling group 30 is made to obtain a high current, the rotor 10 of motor is made to generate larger detent torque, So as to improving the problem of startup of self-start permanent-magnet synchronous motor 1 is not easy.It, should and after the startup of self-start permanent-magnet synchronous motor 1 After the temperature of positive temperature thermistor 62 increases, high impedance can be generated, thus allow electric current restore from capacitance 50 by electric current road Diameter, and the self-start permanent-magnet synchronous motor is made to revert to capacitor split-phase operating.

Second embodiment used particularly suitable for being installed on outdoor electrical equipment (such as：The room of fixed frequency or convertible frequency air-conditioner Outer machine), such as the pedestal 64 can be set on the shell of an electrical equipment, so that the pedestal 64 is exposed to the electric appliance The outside of the shell of equipment, and the pedestal can be assembled in from the outside of the shell of electrical equipment by the external resistance device 60A On 64, or disassembled from pedestal 64.

(advantageous effect of embodiment)

In conclusion the beneficial effects of the utility model are that rotor structure need not be dramatically changed, and only need to pass through In the mode for the one positive temperature thermistor 60 of both ends parallel connection for being serially connected with the capacitance 50 of auxiliary coiling group 30, improvement just can be reached The detent torque of self-start permanent-magnet synchronous motor 1 is insufficient, and the problem of easy synchronization failure, therefore its simple structure, and effectively Reduce cost.

The foregoing is merely the preferred possible embodiments of the utility model, patent model that is non-therefore limiting to the utility model The equivalence techniques variation enclosed, therefore the utility model specification and schema content is used to be done such as, is both contained in the utility model Protection domain in.

Claims (6)

1. a kind of self-start permanent-magnet synchronous motor, which is characterized in that including：

One main coiling group and an auxiliary coiling group, wherein one capacitance of auxiliary coiling group series connection；

One rotor, the field drives which can be generated by the main coiling group and the auxiliary coiling group, and generate rotation；And

One positive warm thermistor, this is just warming quick resistor coupled in parallel in the both ends of the capacitance；

The wherein positive temperature thermistor has the impedance value less than the capacitance, borrows when the self-start permanent-magnet synchronous motor starting So that electric current pass through via the positive temperature thermistor after again by the auxiliary coiling group, to improve the self-start permanent-magnet synchronous horse Up to detent torque when starting.

2. self-start permanent-magnet synchronous motor as described in claim 1, it is characterised in that the rotor is by cage-shaped structure and permanent magnetic Iron construction is constituted.

3. self-start permanent-magnet synchronous motor as described in claim 1, which is characterized in that the front side of the capacitance has respectively with rear side Have one first contact and one second contact, the positive temperature thermistor by one first conducting wire and one second conducting wire be electrically connected this first Contact and second contact.

4. self-start permanent-magnet synchronous motor as claimed in claim 3, which is characterized in that the positive temperature thermistor is set to outside one In shell, there are two pin, the positive temperature thermistor and two pin electrical connections for shell tool, and are electrically connected by two pins Connect first conducting wire and second conducting wire.

5. self-start permanent-magnet synchronous motor as claimed in claim 4, which is characterized in that further include a pedestal, which passes through First conducting wire and second conducting wire are electrically connected first contact and second contact, and this two of the positive temperature thermistor connect Foot can be inserted on the pedestal, and be electrically connected first contact and second contact by the pedestal, and make the positive warm Quick resistance and the capacitance are in parallel.

6. self-start permanent-magnet synchronous motor as claimed in claim 5, which is characterized in that the pedestal is set to an electrical installation On shell so that the pedestal is exposed to the outside of the electrical installation.