CN2191493Y

CN2191493Y - Brushless DC motor

Info

Publication number: CN2191493Y
Application number: CN 94204982
Authority: CN
Inventors: 杨红俊
Original assignee: LOCKUP KUNMING CITY PUBLIC SECURITY BUREAU
Current assignee: LOCKUP KUNMING CITY PUBLIC SECURITY BUREAU
Priority date: 1994-03-22
Filing date: 1994-03-22
Publication date: 1995-03-08
Anticipated expiration: 2004-03-22

Abstract

The utility model relates to a brushless DC electric motor, comprising a stator, a rotor, and coils. The brushless DC electric motor is characterized in that a main body structure is composed of a rotor (1), the iron core ring of the closed spiral coils (2), and the core shaft of the main magnet (3). The iron core ring and the iron core shaft have the same shaft core; the rotor is an enclosed-typed plane which is non-circular and quadrate and is manufactured by non permanent-magnet materials, and the rotor is horizontally arranged and is vertical to the iron core shaft. The iron core shaft is provided with main magnetic coils, and the iron core ring is provided with multi-phase coils. The utility model which can save the materials by 25% to 50% has the advantages of favorable speed-regulating performance, large overload capacity, fast starting, low noise, simple structure, and low cost. The brushless DC electric motor can be suitable for the application field of the large power.

Description

Brushless DC motor

The utility model relates to technical field of motors, specifically brushless DC motor.

Motor mainly is divided into direct current and alternating current motor in the world at present, wherein DC motor has good governor control characteristics, overload capacity is big, can realize Fast starting, braking and reverse running, can adapt to the required various special service requirement of Automation of Manufacturing Process.Above characteristics and requirement are that alternating current machine is difficult to realize.But the weakness of direct current machine maximum is to need brush that armature supply is commutated, and has adopted complicated commutator mechanism, and it is more to make it consume nonferrous materials, the manufacturing process complexity, therefore manufacturing cost is higher relatively, and operation maintenance is difficult, thereby its application also is subjected to some restrictions.

Along with development of electronic technology, developed brushless DC motor at present in the world, utilize electronic device and sensing device to replace the commutator of DC motor exactly, milling group by the permanent-magnet steel rotor of certain number of pole-pairs and a multidirectional armature constitutes, this makes motor reduce sliding contact, has eliminated commutation spark, has reduced wireless interference, it has overcome the commutator shortcoming of DC motor, but this brushless DC motor must adopt the permanent-magnet steel rotor structure to realize.Thereby it is subjected to the restriction of permanent magnetic material, and a limited applications is exported in small-power, and efficient is low, only is applied to particular surroundings, not with extensive use.

The purpose of this utility model is to provide a kind of can overcome above-mentioned deficiency, does rotor with non-permanent magnetic material, and is applicable to the brushless DC motor in high-power applications field.

The utility model is achieved in that brushless DC motor, comprise rotor and stator and coil, it is characterized in that agent structure is made up of rotor, closed helical iron-core coil ring, main magnet mandrel, iron core ring and iron mandrel's concentric, the rotor that non-permanent magnetic material is made is the claw type planar structure, and horizontal positioned is vertical with iron mandrel, and main magnetic coil is arranged in the iron mandrel, on the iron core ring polyphase winding is arranged.

The motor of this operation principle is equivalent to the motor of synchronous working, passes to the fixing multiphase current of phase frequently in the coil as directly organizing at the iron core ring more, and motor can't start, and for allowing it start efficiently and effectively, must realize with control circuit.Its implementation has two kinds, and a kind of is the self-inducting control circuit, and another kind of is the covert start type control circuit of frequency conversion.

The utlity model has following characteristics: speed adjusting performance is good, and overload capacity is big, and starting is fast, and noise is low, owing to use magnetic energy effectively, can dwindle the motor volume greatly, save material 25-50%, and simple in structure, manufacturing cost is low, is easy to promote, and can be suitable for the high-power applications field.

Fig. 1 is an agent structure schematic diagram of the present utility model

Fig. 2 flows to schematic diagram for main magnetic loop of the present utility model

Fig. 3 is the winding structure schematic diagram of coil of the present utility model on the iron core ring

Fig. 4 is four phase current figure of the present utility model

Fig. 5 makes rotor operation process schematic diagram for four phase coil rotary poles of the present utility model

Fig. 6 is a self-inducting control circuit schematic diagram of the present utility model

Fig. 7 is the covert control circuit schematic diagram of frequency conversion of the present utility model

Fig. 8 is a utility structure schematic diagram of the present utility model

Fig. 9 is a utility structure vertical view of the present utility model

Among the figure, the 1-rotor, 2-iron core ring, 3-iron mandrel, the 4-chassis, 5-master's magnetic coil, the 6-position transducer, 7-is controlled circuitry phase, 8-frequency conversion control circuitry phase, 9-rotor, 10-iron mandrel, 11-iron core ring, 12-rotor.

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, the agent structure of brushless DC motor is by rotor 1, closed helical iron-core coil ring 2, main magnet mandrel 3, chassis 4 is formed, iron core ring and iron mandrel's concentric, rotor is a strip, and level places above the iron core ring hangs down with iron mandrel, and main magnetic coil 5 is arranged in the iron mandrel, be wound with four phase coils on the iron core ring, iron mandrel and chassis 4 are connected as a single entity.The concrete shape of rotor also can be cross shape etc., also can place the upper and lower faces of iron core ring, is connected as a single entity with iron mandrel, and main magnetic coil is fixed on the iron core ring (stator), and as Fig. 8, shown in Figure 9, this structure can use magnetic energy most effectively.If need not encourage main magnetic coil, and rotor also can be realized with permanent magnet.

Its operation principle is: main magnetic loop, and as shown in Figure 2, main magnetic coil energising back produces the magnetic field boundary, and the magnetic field boundary by rotor, by the iron core-closed chassis that is looped back to, is finished main magnetic loop by main pole again.As shown in Figure 3, on the iron core-closed ring around on many group coils, in coil, pass to multiphase current shown in Figure 4, each organizes magnetic pole that coil produces under the multiphase current effect, forms the magnetic pole of rotation in the iron core ring.Under the effect of main magnetic coil, rotor is equivalent to a magnetic pole, is subjected to the effect of iron core ring rotary pole, will be stuck in the iron core ring between the two relative magnetic poles, with iron core ring magnetic pole rotation synchronously takes place, as shown in Figure 5.In Fig. 8, the structure shown in Figure 9, last lower rotor part under the effect of main magnetic field boundary, be subjected to respectively the rotary pole that polyphase winding produces on the iron core ring effect and with the stressed running of direction of rotation.

The control circuit of realizing starting is self-induction control type and the covert start type of frequency conversion.The self-induction control type is leaned on each phase current on position transducer 6 and the control phase device 7 control iron core ring coils as shown in Figure 6, makes the commutation with rotor rotation of iron core ring coil to remain the promotion rotor rotation.The covert start type of frequency conversion adopts frequency conversion control phase device 8 as shown in Figure 7, allows iron core ring internal magnetic pole promote rotor and gets into smooth from slow to fast.

Claims

1, a kind of brushless DC motor, comprise rotor and stator and coil, it is characterized in that: 1. agent structure is made up of rotor (1), closed helical iron-core coil ring (2), main magnet mandrel (3), iron core ring and iron mandrel's concentric, rotor is the claw type planar structure, make with non-permanent magnetic material, and horizontal positioned is vertical with iron mandrel, main magnetic coil is arranged in the iron mandrel, on the iron core ring polyphase winding is arranged; 2. motor starting circuit is the covert start type control circuit of self-inducting control circuit and frequency conversion.

2, motor according to claim 1 is characterized in that rotor can be a strip, or cross shape, can place the iron core ring above, also can place the upper and lower faces of iron core ring, iron mandrel can be connected as a single entity with chassis (4), also can be connected as a single entity with upper and lower rotor.

3, motor according to claim 1 is characterized in that four phase coils are arranged on the iron core ring.

4, motor according to claim 1 it is characterized in that encouraging main magnetic coil, and rotor also can be realized with permanent magnet.

5, motor according to claim 1, it is characterized in that the self-inducting control circuit by position transducer (6) with the control mutually device (7) form, the covert start type control of frequency conversion circuitry phase constitutes (8) by frequency conversion control phase device.