CN2478277Y

CN2478277Y - Reversible rotary single phase brushless d.c. motor

Info

Publication number: CN2478277Y
Application number: CN 01237373
Authority: CN
Inventors: 杨忠儒
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-16
Filing date: 2001-04-16
Publication date: 2002-02-20
Anticipated expiration: 2011-04-16

Abstract

The utility model relates to a singe-phase brushless DC electric motor that can conversely rotate, which only needs to be based on prior single-phase brushless DC electric motor and to add to the stator magnetic pole a preset magnetic field. The preset magnetic field is a permanent magnet. Then the single-phase brushless DC electric motor can realize the objective of converse rotation. The structure is simple and reasonable. The positive or the converse starting is convenient and flexible. Change of the direction of the starting current of the excitation coil alone can enable the motor to rotate conversely. The motor is the updated product for prior single-phase brushless DC electric motor.

Description

Single-phase brushless DC motor that can reverse rotation

The utility model relates to a kind of DC motor, and particularly a kind of single-phase brushless DC motor belongs to machine field.

Brushless DC motor is meant that rotor is a magneto, stator is the commutatorless motor of brushless direct-current excitation-type, the rotating magnetic field of stator is carried out work by the sense of current of position detector and electronic switching element control stator exciting coil, also have the problem at a starting dead point for single-phase brushless DC motor, in order to overcome the starting dead point, must design special starting structure is arranged, the starting structure of existing brushless DC motor is with the magnetic pole position that is wound with the stator core of the coil part of pruning, make the magnetic field after its energising produce the angle that skew is arranged, can overcome the dead point and rotor can be started.But because of the direction of magnetic field skew immobilizes, so existing brushless DC motor can only be by a direction starting operation of setting.In order to make the load can forward rotation also can backwards rotation the time, also need between motor and load, install mechanical commutation device additional.

The purpose of this utility model be for overcome above-mentioned existing single-phase brushless DC motor can only folk prescription to the weak point of rotating, design a kind of single-phase brushless DC motor that can reverse rotation simple in structure, easy to use.

The utility model can reverse rotation single-phase brushless DC motor comprise rotor and stator, permanent magnet is housed on the described rotor, be wound with magnet exciting coil on the stator, also on the magnetic pole of stator, be equipped with simultaneously and preset magnetic field, the described magnetic field of presetting is permanent magnet.One utmost point of described permanent magnet is contained in a side of magnetic pole of the stator, and another utmost point of permanent magnet is contained in the opposite side of magnetic pole of the stator.

Accompanying drawing 1 is the structural representation of existing single-phase brushless DC motor;

Accompanying drawing 2 is structural representations of the forward rotation of single-phase brushless DC motor that can reverse rotation;

Accompanying drawing 3 is structural representations of the backwards rotation of single-phase brushless DC motor that can reverse rotation.

Among the accompanying drawing 1-3 1 is the stator core that is wound with magnet exciting coil, the 2nd, and rotor, the 3rd, be contained in the permanent magnet on the magnetic pole of the stator, dotted line is represented the magnetic line of force, arrow is represented the rotation direction of rotor.Referring to Fig. 1, because the magnetic pole of stator core is by the part of pruning, so rotor can only clockwise rotate in the direction of arrows, the counter-clockwise rotation if the position of pruning is opposite with Fig. 1, in a single day but become product, just can only be by the direction one-directional rotation that designs.Referring to Fig. 2 and Fig. 3, owing on the magnetic pole of stator core permanent magnet is housed, when the starting current of magnet exciting coil makes the magnetic pole of the stator direction as shown in Figure 2, this excitation field rotates rotor with presetting an angle of stack magnetic field deflection to the right in magnetic field in the direction of the clock, when the starting current of magnet exciting coil makes the magnetic pole of the stator direction as shown in Figure 3, this excitation field makes rotor by rotation counterclockwise with presetting an angle of stack magnetic field deflection left in magnetic field, so brushless single-phase DC motor of the present utility model can be realized forward or backwards rotation.Shown in Fig. 1-3 be stator at structural representation interior, rotor outward rotation type motor outside, when, stator interior as rotor is installed in was installed in outer interior rotatable motor, its structure then was on the magnetic pole of outer stator permanent magnet to be housed and to get final product being installed in.

The utility model only needs on the basis of existing single-phase brushless DC motor, on magnetic pole of the stator, add the magnetic field of presetting of permanent magnet, can make single-phase brushless DC motor realize can reverse rotation purpose, save mechanical commutation mechanism, have simple and reasonable, forward or reverse starting are convenient, flexible, can make the motor counter-rotating as long as change the starting current direction of excitation line chart, are the upgraded products of existing single-phase brushless DC motor.

Claims

One kind can reverse rotation single-phase brushless DC motor comprise rotor and stator, on the described rotor permanent magnet is housed, be wound with magnet exciting coil on the stator, it is characterized in that being equipped with on the magnetic pole of stator and preset magnetic field, the described magnetic field of presetting is permanent magnet.
2. single-phase brushless DC motor that can reverse rotation as claimed in claim 1 is characterized in that a utmost point of permanent magnet is contained in a side of magnetic pole of the stator, and another utmost point of permanent magnet is contained in the opposite side of magnetic pole of the stator.