1. The tombarthite and permanent magnetism do not have structure characteristic of brushing the direct current motor

1.1 Have not brushed the direct current motor (BLDCM ) and is formed by noumenonn of the motor and driver , it is a kind of typical integrated products of electromechanics.
1.2 Stator winding of motor make three-phase symmetrical competent to connect law star, with asynchronous to very much similar motor have three-phase have. The motor rotor is formed by neodymium iron boron permanent magnetism material . Produce the square wave magnetic field with alternate N-S grade in the air crack that the rotor forms definitely, so call this kind of motor " the square wave motor ". In order to make the motor winding accurate and reversing , contain the position sensor in the motor, as the position signal of polarity of the rotor
1.3 driver making up ：
Regarded as the single film which controls the centre;
Go against and is turned what the electron is formed by IGBT or MOSFET reversingly into the bridge;
Hand in as voltage type one pay main rectification of circuit , strain the wave unit;
As the keyboards and digital display units of the man-machine interface;
As controlling, urging the switch power of the power.

2. There is no main characteristic of brushing the direct current motor

2.1 High efficiency: Is it brush direct current motor rotor is it have copper is it have iron dawdle either to dawdle to have , than raise by 5%-12% with the asynchronous motor of capacity efficiency its to have.
2.2 The power factor is high: It doesn't need to draw the excitatory electric current from the electric wire netting not to brush the direct current motor, the power factor is close to 1.
2.3 The starter torque is large, it is small to start the electric current: Is it brush mechanical characteristic of direct current motor and regulate characteristic and he defy direct current motor pivot corresponding similar characteristic when accusing of to have, so its starter torque is large, it is small to start the electric current, it is wide to regulate the range, but without shortcoming caused by reversing device of electric brush , the electron has replaced machinery reversingly reversingly .
2.4 Whether it is high for motor to exert oneself. When the volume of this motor is the same as highest working rotational speed, the output power of more asynchronous motor improves by 30%.
2.5 Have a good adaptability: It is worth +10% that the voltage of the power deviates from amount or- 15%, when the environment temperature differs by 40K and load torque and fluctuates from 0-100% of the specified torque , there are not the actual rotational speed of brushing the direct current motor and stable state deviation of establishing the rotational speed, not greater than establishing rotational speed ±1%.
2.6 Is it brush direct current motor whether one automatic control type transfer speed to be systematic , it need is it start winding to need like ordinary synchronous motor to have; In load sudden change , will not produce and shake and lose the step .
2.7 There is no structure of brushing the direct current motor and having characteristic of the direct current motor , exchanging the asynchronous motor.
2.8 Have not brushed the direct current motor and is suitable for the occasion that operates , frequently starting at a low speed for a long time, this it is frequency conversion governor that pull Y series motor impossible realize.

　　　　　　　　　　　　　　　　　　　　products introduction
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　　ZWS tombarthite and permanent magnetism have no direct current brushing machine to make rotor material with the permanent magnetism material of high-performance tombarthite , replace the reversing device of carbon brush with the position sensor, control the circuit and realize electrons reversingly with the electron. It has kept all advantages of the traditional direct current machine, overcame the shortcomings of carbon brush , traveller with complicated and of high fault rate structure again at the same time .
● The characteristic of the torque is excellent, the torque of China , low-speed is of good performance, the starter torque is big ;
● Transfer speed to be precision high, transfer speed to be in extensive range, is it impose ability to be strong to pass;
● The rotor rotates the inertia small, the response speed is fast; It is the small, the light, not than power (already power , the volume one than) heavy;
● Characteristic of applying the brake is good;
● With high efficiency, the machinery that there is not the power of excitation and rubing between carbon brush , traveller losses , it is the energy-conserving products;
● Of simple structure, dependability is high, the stability is good, have a good adaptability, maintenance is simple;
● Able to bear shaking joltly , the noise is lower, shake smaller, operating more level and more smooth, the life-span is longer;
● There is no radio interference, there is not electric brush that rub the spark produced , is especially suitable for the dangerous area of the explosibility , suitable for the abominable working environment, is suitable for the high frequency degree starting etc. and using the occasion fast;
● Protect the grade ：IP-54，IP-55；
● It reach rotational speed it is the the most high (60000 rotate /minute) 。

　　　　　　　　　　　　　　　　　　　　　　 Operation principle
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　 Have not brushed the direct current motor and is made up of subject of the motor and driver , it is a kind of typical integrated products of electromechanics.
● Stator winding of motor make into three phase symmetrical star connect law , with asynchronous to very much similar motor have three-phase have more. Glue permanent magnet that has already filled the magnetism on the rotor of the motor, in order to measure the polarity of the motor rotor, contain the position sensor in the motor. The driver is formed by the electronic device of the power and integrated circuit ,etc., its function is: The arrival which accepts the motor, signal of stopping , applying the brake, in order to control the arrival of the motor , stop and applying the brake; Accept position sensor signal and positive and negative to transfer signal to , is it control against turn into whom bridge every power in charge of put through and disconnected to used for, produce the continuous torque ; Accept the speed order and speed feedback signal , is used for controlling and adjusting the rotational speed; Offering protects and shows etc.. There is no principle sketch which pastes up the direct current motor as Fig. 1 shows: 　


　　 Main circuit hand in one typical voltage type- frank- pay circuit , go against piece 5-26KHZ symmetrical reversal rectangle wave to modulate wave frequently of offering etc. of becoming etc. Permanent magnet N-S is exchanged alternativly, make the position sensor produce U , V , W square unexpected turn of of bad 120?? of phase place, It produces six effective state code signals to combine the signal / overturn: 101, 100, 110, 010, 011, 001, is it is it produce through logic T1-T4 is led coherently , T1-T6 is led openly , T3-T6 is led , is it add in A +B - , A +C - , B +C - , B +A - , C +A - , C +B sequentially direct current bus bar voltage to that is to say- have, rotor in this way turn over one N-S very much, T1-T6 power in charge of according to regular to make to lead put through sequentially six state up promptly each time. Under each kind of state , only there is a double-phase winding that is electrified , change a kind of state sequentially, stator magnetic field axis that winding produce rotate 60?? electricity degrees of horn in space, rotor follow stator magnetic field is it equivalent to 60?? electricity degrees of corner space position to rotate, the rotor is on the new position, make position sensor U , V , W produce a group of new codes according to agreeing on, new code change whom power in charge of lead coherent to make up , make stator magnetic field axle that winding produce advance and then 60?? cable degrees of corner, circulate so, is it brush direct current motor produce continuous torque , pull load rotate in succession to have. Is it brush direct current motor whom oneself produce , go against person who become force not reversing to have, called the automatic control type synchronous motor.

● There is not position sensor code which brushes the direct current motor that make the two phase electrified wind and make up into a leading rotor magnetic field axis seat of axis position of the magnetic field, so no matter initial position of rotor where does it in, in is it can produce heavy starter torque enough twinkling of an eye to start motor, so the rotor is had and does not need to have and start the winding separately . Because the magnetic field axis of the stator can be regarded as with the axis of the rotor vertically, in a situation that the iron core is unsaturated, the average electromagnetic torque produced is in direct proportion to winding electric current, this is exactly electric current that he encourages the direct current motor- the characteristic of the torque . The torque direct radio of the motor is on the winding average electric current; TM =Ktlav(N M)The double-phase group of the motor is against the difference of the electric potential than the angular speed to the motor; ELL =Ke|? (V ) average electric current the reason why in the motor winding is: Iav =(Vm-ELL) /among them in 2Ra (A ),Vm =δ VDC Unless add at motor space VDC voltage average, VDC for direct current bus bar voltage, |? who modulates wave to take empty than, Ra is every looks winding resistance. Therefore can get the electromagnetic torque of the direct current motor : Tm =δ (VDC Kt/2Ra)-Kt (Ke|? / 2Ra) Kt , Ke are structure constants of the motor, |? is the angular speed (rad/s ) of the motor, So, in certain |?, to change and take is empty than |?, can change the electromagnetic torque of the motor linearly , get and encourage the voltage of electronic electromechanical pivot of tributary and control the same control characteristic and mechanical characteristic with him. The rotational speed of pasting up the direct current motor is not established , depend on the level of speed order Vc, if the order maximum of the speed is +5V corresponding supreme rotational speed: Vc(max) ¨?N max, then, any level is corresponding and suitable rotational speed n under +5V, this realization changes speed to establish . After Vc is established , no matter load changes, the voltage of power changes, or environment temperature change, when lower than the rotational speed of order in rotational speeding , feedback voltage Vfb diminish , modulate to take empty to can than |?heavy wave, the armature electric current becomes great， The electromagnetic torque making the motor produce increases and produces the acceleration, until equal to rotational speed of order in actual rotational speed of the motor; On the contrary, when the order of actual rotating ratio of the motor is high in rotational speed, δ is reduced, Tm is reduced. Deceleration takes place, until actual rotational speed is equal to rotational speed of order. We can say , have not brushed the direct current motor in the electric wire netting fluctuating range of allowing, under the overload capacity of allowing, its rotational speed of stability and rotational speed of order are differed by about 1%, and can realize the permanent torque runs in adjusting the speed range . Because there is no excitation of brushing the direct current motor to stem from permanent magnet , does not need to draw the excitation electric current from the electric wire netting like asynchronous machine ; Because not so open as reversal magnetism in the rotor, its rotor is had there is no iron to dawdle if there is no copper to dawdle, so efficiency than about 10% more motor with capacity have while being asynchronous , generally speaking , is it brush ability indicator (ηcosθ ) of direct current motor than three motor 12%-20% high different step with capacity have to have.

● Is it brush direct current motor to run with automatic control type , can is it put as frequency conversion heavily loaded synchronous motor that starts add and start the winding on the rotor so rapidly to adjust to have, will not produce shaking and lose the step in load sudden change either. The permanent magnet not pasting up the direct current motor of the medium and small capacity, adopt more materials of tombarthite and neodymium and iron boron (Nd-fe-B ) that the high magnetism can be accumulated now. So tombarthite permanent magnetism is it brush volume of motor than dwindle first plane seat number with capacity three different step motor to have. Have adjusted the research of the speed to the frequency conversion of the asynchronous motor in the past 30 years, is looking for the method to control asynchronous motor torque after all, there is no electric current or voltage of end of the armature of brushing the direct current motor , but directly control the physical quantity of the motor torque . In the past, because higher factor of the price of tombarthite permanent magnet, restrained the tombarthite and permanent magnetism from having no application which brushed the direct current motor, but with the constant innovation of technology, its price has already dropped rapidly, for example, our company introduce BS series is it brush price of direct current motor already hardly differ from asynchronous motor and sum of the price of ordinary frequency converter to have. Tombarthite permanent magnetism is it brush direct current motor will wide to transfer speed , little volume , high efficiency , stable state rotational speed error characteristic such as being little transfer speed field appear the advantage with their to have.