CN2364620Y - Semiconductor converter low-speed reluctance motor - Google Patents

Abstract

Semiconductor commutated low speed reluctance motor includes salient pole type stator core, hidden pole type rotor core, rotor has no winding, stator salient pole has small teeth, the total number of small teeth is Z ₁ , the number of rotor teeth is Z ₂ and the maximum occurrence times of air gap permeance The space between P _v satisfies Z ₁ =Z ₂ ±P _V . Concentrated coils are set on the salient poles. The _PV coils at the opposite positions of the magnetic field in space are connected in series and a diode is connected in series to form a coil group. Each phase winding consists of space Two coil groups with an electrical angle difference of 180° are connected in parallel and two diodes are antiparallel. The motor can run on a three-phase or single-phase power supply, and has the advantages of simple structure, convenient manufacture, low cost, large torque, wide speed, and safe and reliable operation.

Description

Semiconductor commutated low speed reluctance motor

The utility model relates to a low-speed electric motor, which is particularly suitable for occasions requiring low-speed high-torque driving and stirring in industries such as food processing, chemical industry, building materials, and household appliances.

In order to obtain high torque at low speed, the most commonly used gear reduction device in the past is to use a gear reduction device, which not only complicates the structure and manufacturing process of the entire system, increases the volume and weight, but also due to factors such as gear backlash, tooth profile processing, wear, etc. Influence, the accuracy and reliability of the whole system are reduced, the speed is unstable, the noise is large and the efficiency is low. In addition, there are also traditional electromagnetic deceleration motors. The stator of this motor uses AC distributed windings. The manufacturing process is complicated, the copper consumption is high, the cost is high, and the power index is not high.

The purpose of the utility model is to provide a semiconductor commutation low-speed reluctance motor with simple structure, convenient manufacture, low cost, safe and reliable operation, wide speed range and large torque.

The technical solution of the utility model is: the motor includes a salient pole type stator core, a hidden pole type rotor core, the rotor has no winding, each stator salient pole has several small teeth, the total number of rotor teeth is Z ₂ , and the stator salient pole The total number of small teeth is Z ₁ , then the number of teeth of the stator and rotor satisfies Z ₁ = Z ₂ ±P _υ , (P _υ is the number of occurrences of the maximum air gap permeance), and concentrated coils are nested on the salient poles of the stator respectively, and the space The P _υ coils in the opposite position of the magnetic field are connected in series in parallel and a diode is connected in series to form a coil group. Each phase winding of the motor is connected in parallel by two coil groups with a spatial difference of 180° electrical angle, and the two diodes Inverse and constitute.

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic diagram of a stator and rotor core of the present invention;

Fig. 2 is a schematic diagram of the structure of the motor winding in Fig. 1;

Figure 3 is a winding wiring diagram during single-phase operation;

Figure 4 is a diagram of the working principle of the motor.

The example shown in Fig. 1, the frequency of occurrence of the maximum value of the air gap permeance of the semiconductor commutated low-speed reluctance motor P _υ = 2, the stator core I has 12 salient poles, the hidden pole rotor core II has no winding, and its number of teeth Z ₂ = 34 , then the total number of stator salient pole small teeth Z ₁ =Z ₂ +P _υ =36, each salient pole has 3 small teeth IV, and each salient pole is respectively nested with a concentrated coil III, (only # is drawn in the figure 1 coil), the two coils in the opposite position of the magnetic field are connected in series in parallel and a diode is connected in series to form a coil group. The motor has #1, #7 coils and diode D ₁ respectively in the 360° electric angle of space , #2, #8 coil and diode D ₃ , #3, #9 coil and diode D ₅ , #4, #10 coil and diode D ₂ , #5, #11 coil and diode D ₄ , #6, #12 The coil and the diode D ₆ form six coil groups, as shown in Figure 2, two coil groups with a spatial difference of 180° in electrical angle are connected in parallel, and the two diodes are reversely paralleled to form a one-phase winding of the motor. The three-phase windings can be connected in Y or △ connection, connected to the three-phase power supply to form a three-phase motor, or as shown in Figure 3, the two-phase windings can be connected in series and then connected to the power supply, and the other phase winding can be connected to the power supply after being separated by capacitors become a single-phase motor.

The motor of the utility model is driven by the electromagnetic torque of the reluctance property, and its working principle is referred to Figure 4. For the sake of simplicity, 12 salient poles are set, and the small tooth on each salient pole is 1, that is, the number of stator teeth Z ₁ =12, the number of rotor teeth Z ₂ =10 (or 14), where P _υ =2. When working, the stator three-phase winding is connected to the three-phase symmetrical AC power supply. If the diodes D ₁ and D ₃ are turned on at the moment shown in Figure 4a), #1, #7 and #2, #8 coils are energized to generate a magnetic field. Due to the stator 1 Teeth and 7 teeth are not aligned with the rotor teeth, the magnetic field is distorted, and the rotor tends to the state of minimum reluctance, so electromagnetic torque is generated to drive the rotor to rotate in the direction shown in the figure (when the rotor has 14 teeth, the direction of rotation is opposite to the direction shown in the figure); When the rotor rotates through 60° electrical angle to the position in Figure 4b), D ₃ is disconnected, D ₁ and D ₆ are turned on, and #1, #7, #12, and #6 coils are energized to generate a magnetic field and electromagnetic torque to make the rotor Continue turning in the direction shown, and so on. The conduction sequence of the diodes in one cycle is D ₁ D ₃ -D ₁ D ₆ -D ₆ D ₄ -D ₄ D ₂ -D ₂ D ₅ -D ₅ D ₃ , one diode is commutated every 60° electrical angle , each tube is continuously conducted at an electrical angle of 120°. Therefore, the motor uses the switching action of the diodes directly connected to the stator windings to make the windings of each phase turn on the power in a certain order to generate a rotating magnetic field and an electromagnetic torque with a constant direction to realize continuous operation of the motor.

The electric motor of the utility model can be a rotary motor whose rotor is an inner rotor or an outer rotor, or can be developed into a linear motor that moves in a straight line.

To sum up, the semiconductor commutated low-speed reluctance motor of the utility model has no windings on the rotor, the stator adopts concentrated windings, and the diodes are used to realize the conduction and shutdown of the winding current. Its structure is very simple, and it is very convenient to manufacture and use. It is safe and reliable, low in cost, and small in size. Tests have shown that the speed of the motor can range from several to several hundred revolutions per minute, and the torque can range from several Nm to hundreds of Nm. The current is small, and the time for starting, braking and reversing is short. It is suitable for frequent starting, braking and forward and reverse work. The power factor can reach 1.0 when running under single-phase power supply. There is no high-speed rotation and easy-to-wear parts, stable operation, and low noise; used in the food processing industry, it can completely avoid the pollution of food caused by the leakage of lubricating oil in the gearbox, and is an environmentally friendly motor.

Claims (3)

1. Semiconductor commutated low-speed reluctance motor, characterized in that it includes a salient pole stator core [I], a hidden pole rotor core [II], the rotor has no windings, and each stator salient pole has several small teeth [IV ], assuming that the total number of rotor teeth is Z ₂ , and the total number of stator salient pole teeth is Z ₁ , then the number of stator and rotor teeth satisfies Z ₁ = Z ₂ ±P _υ , (P _υ is the number of occurrences of the maximum air gap permeance), in Concentrated coils [III] are nested on the salient poles of the stator, and the P _υ coils in the space opposite to the magnetic field are connected in series in parallel and a diode is connected in series to form a coil group. Each phase winding of the motor is composed of space Two coil groups with an electrical angle difference of 180° are connected in parallel, and the two diodes are antiparallel. 2. The semiconductor commutated low-speed reluctance motor according to claim 1, characterized in that the motor is a rotary motor whose rotor is an inner rotor or an outer rotor, or a linear motor that expands into a linear motion. 3. The semiconductor commutated low-speed reluctance motor according to claim 1, characterized in that the motor is a three-phase motor connected to a three-phase AC power supply, or a single-phase motor connected to a single-phase AC power supply, when it is a single-phase motor , the two-phase windings in the three-phase windings are connected in series and then connected to the power supply, and the other phase windings are separated by capacitors and then connected to the power supply.

Images