CN101557148A - Single-phase capacitor running motor - Google Patents

Abstract

The invention relates to a single-phase capacitor running motor. The motor comprises a motor shaft, a rotor, a stator, a front end cover and a rear end cover, wherein the rotor is sleeved on the motor shaft, the stator is sleeved on the outer side of the rotor, the front end cover and the rear end cover which are mutually buckled are arranged on the outer side of the stator, two ends of the motor shaft are arranged on the rear end cover of the front end cover through a bearing, a stator core of the stator is provided with a deep-row groove and a shallow-row groove, a winding of the stator is a centralized winding comprising a first winding and a second winding, coils of the first winding and the second winding are respectively wound in the deep-row groove and the shallow-row groove of the stator core, coils of the first winding wound on the deep-row groove are wound in the forward and reverse directions, coils wound on the shallow-row groove are wound in the forward and reverse directions, and the first winding is connected with the second winding in parallel after being connected with a capacitor in series or the second winding is connected with. The invention can save about 20% of wire, and for the motor with thin iron core and large winding span, the copper consumption of the winding is saved more obviously, and the winding shortens the axial length of the motor, the machine winding is realized in the stator winding manufacture, the processing flow is simplified, and the stator production efficiency is improved; in addition, the concentrated stator adopted by the invention has high winding coefficient, is suitable for motors with different pole numbers and different powers, and has good motor performance.

Description

A single-phase capacitor running motor

technical field

The invention relates to a single-phase capacitor-operated motor, in particular to a single-phase capacitor-operated motor with concentrated windings, which belongs to the invention technology of stator punching of the single-phase capacitor-operated motor.

Background technique

AC motors, especially AC motors for fans, generally use ordinary single-phase capacitor-operated asynchronous motors, and ordinary single-phase capacitor-operated asynchronous motors usually use distributed windings, as shown in Figure 4: the first winding 41 and the second winding 42 Both sides of the coil cross a certain number of stator slots and are embedded in two non-adjacent stator slots 431. Since the stator slots 431 are distributed on the same circumference, or the depth of the bottom of the slots is equivalent, in order to meet the requirements of the first winding 41 and the second winding After the second winding 42 is inserted into the foot wire, the two groups of coils have enough avoidance space at the notch of the iron core, so the length of the first winding 41 and the second winding 42 extending out of the iron core must be sufficient, that is, the length of the coil end must be sufficient. Especially when more copper wires are embedded in the iron core slot 431, the end of the winding coil needs to be longer. Therefore, the length of the end of the coil increases and the amount of copper used increases, especially for a motor with a large outer diameter of the iron core and a small thickness of the iron core. The copper wires at the ends account for more than 60% of the copper wires used in the motor. In addition, the first winding 41 and the second winding 42 of the above-mentioned structure are at the same level in spatial distribution, and it is impossible to realize cross-slot concentrated winding. For the motor, the winding coil end not only consumes copper, but also consumes electric energy, which affects the efficiency of the motor. Therefore, how to minimize the winding coil end and improve the actual utilization of the winding coil without deteriorating the performance of the motor is a research breakthrough. direction.

In addition, because the concentrated winding motor is relatively flat, the axial dimension is shortened, and the height of the motor end cover is shortened, which can save materials and greatly save the installation space of the motor. There are common single-phase capacitor-operated asynchronous motors with concentrated windings on the market, such as As shown in Figure 5, the motor adopts a slotted stator core 53, the slot depth and area of the slotted stator core 53 are the same, and the first winding 51 and the second winding 52 are coils wound on a stator tooth. The problem is that the winding distribution coefficient is low, the cogging torque pulsation is large, the electromagnetic torque pulsation is also large, the motor efficiency is low, and the performance will deteriorate. It is only suitable for motors with a small number of poles and low power.

Contents of the invention

The object of the present invention is to consider the above problems and provide a single-phase capacitor running motor that can effectively reduce the length of the motor winding end, has high winding distribution coefficient, small cogging torque ripple, small electromagnetic torque ripple, and high motor efficiency. The invention can be suitable for motors with different numbers of poles and different powers, and the performance of the motor is good and the cost is low.

The technical solution of the present invention is: the single-phase capacitor running motor of the present invention includes a motor shaft, a rotor, a stator, a front end cover and a rear end cover, the rotor is sleeved on the motor shaft, the stator is sleeved on the outside of the rotor, and the outside of the stator is mutually Fastened front end cover and rear end cover, the two ends of the motor shaft are installed on the front end cover and rear end cover through bearings, and the stator iron core of the stator is made with deep row slots and shallow row slots. It is a concentrated winding including the first winding and the second winding. The coils of the first winding and the second winding are respectively wound in the deep slots and shallow slots of the stator core, and the first winding wound on the deep slots The adjacent coils are wound in forward and reverse directions, and the coils on the second winding on the shallow row of slots are wound in forward and reverse directions, and the first winding is connected in parallel with the second winding after the capacitor is connected in series or the second winding is connected in series with the capacitor. in parallel with the first winding.

The above-mentioned rotor is a squirrel-cage rotor.

The above-mentioned rotor is a squirrel-cage bar permanent magnet asynchronous starter rotor.

The above rotor is a reluctance start rotor.

In the present invention, due to the use of double rows of slots on the stator core, the winding of the stator is a concentrated winding including a first winding and a second winding. The structure in the row slot has a short length of the coil end. Compared with the existing distributed winding, it can usually save about 20% of the wire material. For the motor with a thin core and a large winding span, the saving of copper for the winding is more obvious. And this kind of winding shortens the axial length of the motor, and the production of the stator winding realizes machine winding, reduces the processing flow, and improves the production efficiency of the stator; Compared with the concentrated winding, the winding coefficient is high, the cogging torque pulsation is small, the electromagnetic torque pulsation is small, the motor efficiency is high, and it can be suitable for motors with different poles and different powers, and the motor performance is good and the cost is low.

Description of drawings

Fig. 1 is a side view half-sectional view of the motor of the present invention;

Fig. 21 is a squirrel-cage rotor diagram of the present invention;

Fig. 22 is the squirrel cage bar asynchronous starting permanent magnet rotor figure of the present invention;

Fig. 23 is a diagram of the reluctance starting rotor of the present invention;

Fig. 3 is a schematic structural view of the stator of the present invention;

Fig. 31 is a concentrated winding diagram of the first winding in the motor of the present invention;

Fig. 32 is a concentrated winding diagram of the second winding in the motor of the present invention;

Fig. 33 is a schematic structural view of the slotted stator core with deep and shallow double row slots of the present invention;

Fig. 34 is a connection diagram between the stator phase windings of the present invention;

FIG. 4 is a schematic diagram of an existing distributed winding;

Figure 41 is a schematic diagram of the stator core of the distributed winding;

Figure 5 is a schematic diagram of a slotted concentrated winding;

Fig. 51 is a schematic diagram of a slotted stator core.

Detailed ways

Example 1:

Embodiment 1 of the present invention discloses an AC motor for a fan, specifically a single-phase concentrated winding permanent magnet synchronous motor for a fan. There are motor shaft 1, rotor 2, stator 3, front end cover 4 and rear end cover 5, wherein the rotor 2 is set on the motor shaft 1, the stator 3 is set on the outer side of the rotor 2, and the outer side of the stator 3 is the front end cover 4 which is fastened with each other. And the rear end cover 5, the two ends of the motor shaft 1 are installed on the front end cover 4 and the rear end cover 5 through bearings, wherein the stator core 33 of the stator 3 is made with deep row grooves 331 and shallow row grooves 332 double row grooves , the winding of the stator 3 is a concentrated winding including the first winding 31 and the second winding 32, and the coils of the first winding 31 and the second winding 32 are respectively wound in the deep groove 331 and the shallow groove 332 of the stator core 33 Inside, the coils of the first winding 31 wound on the deep row of slots 331 are wound in forward and reverse directions between adjacent ones, and the coils of the second winding 32 wound on the shallow row of slots 332 are wound in forward and reverse directions between adjacent ones, and the second The winding 32 is connected in parallel with the first winding 32 after the capacitor C is connected in series.

The length of the concentrated winding around the iron core teeth is much shorter than the length of the distributed coil, which can usually save about 20% of the wire, especially for the motor with a thin iron core and a large winding span, saving the amount of copper used in the winding is more obvious; in addition , This kind of winding is wound by machine, and the production of stator reduces the winding and dropping process of ordinary distributed windings, improves the production efficiency of the stator, and greatly reduces the overall cost of the motor.

Slot insulation is embedded in the iron core slot of the finished motor with deep and shallow double-row slot structure, and the slot insulation isolates the winding from the iron core to ensure sufficient electrical strength.

The stator of this structure can adopt different rotor structures according to the performance requirements of the motor: it can be used for single-phase capacitor-operated asynchronous motors whose rotor is a squirrel-cage rotor, and the squirrel-cage rotor is shown in Figure 21; Capacitor AC permanent magnet synchronous motor, squirrel cage bar asynchronous starting rotor is shown in Figure 22; it can be used for single-phase AC permanent magnet synchronous motor with capacitor reluctance starting rotor, and reluctance starting rotor is shown in Figure 23.

Figure 33 shows an 8-pole stator core. For motors with different pole numbers, increase or decrease the corresponding number of teeth, which is also applicable to motors with 2 poles, 4 poles, and 6 poles; for the motor rotors in Figure 21, Figure 22, and Figure 23 In other words, the corresponding number of slots or magnets needs to be adjusted.

When the motor is running, a capacitor C is connected in series with the second winding 32, and the first winding 31 shown in FIG. 31 is connected in parallel with the second winding 32 with the capacitor C connected in series. As shown in FIG. 34, the power supply is then connected. The two adjacent concentrated coils of the first winding 31 shown in Figure 31 are wound in opposite directions, and the current flows through the concentrated winding to generate a pulsating magnetic field in the iron core; for the same reason, the adjacent second winding 32 shown in Figure 32 The two concentrated coils are wound in opposite directions, and the current flows through the concentrated winding to generate another pulsating magnetic field in the iron core; the second winding 32 shown in Figure 32 is connected with a capacitor C in series with another set of first winding 31 shown in Figure 31 Magnetic fields with a certain phase angle difference are generated in the stator air gap respectively, and the two rotating magnetic fields are combined to form an elliptical rotating magnetic field, which can drive the rotors in Fig. 21, Fig. 22, and Fig. 23 to rotate respectively.

Example 2:

The difference between this embodiment and Embodiment 1 is that the first winding 31 is connected in parallel with the second winding 2 after the capacitor C is connected in series. Other structures are the same as in Embodiment 1.

Claims (4)

1. A single-phase capacitor running motor, including a motor shaft (1), a rotor (2), a stator (3), a front end cover (4) and a rear end cover (5), wherein the rotor (2) is set on the motor shaft (1), the stator (3) is set on the outer side of the rotor (2), the outer side of the stator (3) is the front end cover (4) and the rear end cover (5) which are interlocked with each other, and the two ends of the motor shaft (1) pass through The bearings are installed on the front end cover (4) and the rear end cover (5), and it is characterized in that the stator core (33) of the stator (3) has double rows of deep grooves (331) and shallow grooves (332). The winding of the stator (3) is a concentrated winding including the first winding (31) and the second winding (32), and the coils of the first winding (31) and the second winding (32) are respectively wound on the stator core In the deep groove (331) and the shallow groove (332) of (33), the coils of the first winding (31) wound on the deep groove (331) are forward and reversely wound between adjacent ones, and wound in the shallow groove The coils on the second winding (32) on (332) are adjacently wound in forward and reverse directions, and the first winding (31) is connected in parallel with the second winding (32) after the capacitor (C) is connected in series or the second winding (32) The capacitor (C) is connected in parallel with the first winding (32) after being connected in series. 2. The single-phase capacitor-operated motor according to claim 1, characterized in that the rotor (2) is a squirrel-cage rotor. 3. The single-phase capacitor running motor according to claim 1, characterized in that the above-mentioned rotor (2) is a squirrel-cage permanent magnet asynchronous starter rotor. 4. The single-phase capacitor-operated motor according to claim 1, characterized in that the rotor (2) is a reluctance start rotor.

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