Base of frequency conversion technology

The ability after having these parameter is made [occupy estimation only] reach [turn poor (slippery difference) compensation] .

Also because of this technology, still can obtain good locomotive precision below the movement that does not have coder.

3, without coder movement is on speed control, compare with a loop of old-style Variablefrenquency transducer, magnetism bundle vector transducer interior is reached by function of speed observation computation shut return circuit.

Motor side need not install coder to also can achieve good speed precision.

Without coder movement is like next advantage: 1) , layout essence saves;2) , need not fear RF noise is low to coder the influence;3) of voltage signal, in what shake more the circumstance need not worry about the high fault rate of coder.

4, the vector control of transducer is in AC motor, rotor by stator winding faradic generation magnetic field.

Stator electric current contains two parts.

One part affects magnetic field, another part affects motor to output torsion.

Should use AC motor to be in need speed and torsion pilot circumstance, must can control the voltaic depart that affects torsion, and magnetism Shu Shi measures control to be able to depart this two parts undertake becoming independent controlling.

(The physical quantity that has size and way calls vector) 5, fieldWeakeningFieldWeakening circuitry can use the field electricity with abate motor, the balance of change and magnetic field concerns, make motor prep above basic rotate speed runs.

6, decide torsion application place to need the situation that torsion volume does not go because of speed, commonly used to [calm torsion applies] .

Wait for load like conveyer belt.

[Calm torsion applies] the starting torsion with normally bigger need.

[Calm torsion applies] have motor and calorific problem easily when low speed runs, settlement methodological: ? Li?1) increases motor power;(2) to use of the transducer that decides fast refrigeration special motor (namely motor cooling means is compulsive wind cold) .

7, change torsion application sees more at centrifugal type load, for example pump / fan / fan, the end that its use transducer is commonly energy-saving.

When running with 50% rotate speed when fan for instance, what its need torsion to be less than run amain be needed.

Alterable torsion transducer can only what accord motor needs torsion, achieve energy-saving result.

The brief summit summit in second application is laden normally need not the energy with accord additional motor.

Friend goes the overload ability of torsion transducer can apply to major utility.

The overload that * decides torsion transducer (electric current) ability must be rating 150%/1minute, and what alterable torsion transducer needs overload (electric current) ability needs rating 120%/1minute only.

Because centrifugal type is mechanical,very few meeting exceeds rated electric current in utility.

Additional, change torsion utility place needs to start torsion also relatively calm torsion utility is small.

8, transducer is special and motor alleged [Inverter-dutyMotor] , main feature is as follows: 1) , detached type its force is ventilated (its force wind is cold) ;2) , 10Hz-60Hz outputs;3) to decide torsion, ;4) of tall starting torsion, low noise;5) , motor contains coder.

* but those who be not all weighing for transducer the motor of special motor has the above-listed feature.

9, about timing: 1) timing: According to operating mode need adjusts device traversal speed, in order to achieve energy-saving fall bad news, decrease wear away, by want the end such as production. 2) dc timing (DCControler/motor) : By dc electric machinery of controller adjustment dc adjusts the purpose of speed with achieving. 3) communicate frequency control (ACinverter/motor) : The three-phase alternating current that outputs frequency change by transducer controls the rotate speed of alternating current machine thereby. 4) vector frequency control (ACvectorinverter) : Pass complex computational commutation, make communicate transducer to control alternating current machine according to the control means of dc machine, achieve exact rate thereby control, torsion control, raise the character such as output torque. 5) servo controls a system (Servocontrolsystem) : Speed feedback or positional feedback element introduce in athletic system, the action that carries negative feedback is achieved extremely accurate speed control, fixed position control and tall trends are answered. 10, component of a few common industry: 1) measure fast dynamo (Tacho-generator) : A kind of rotate speed measures component, have the branch of communication, dc. 2) rotate transformer (Resolver) : Well and truly rotate speed and angular displacement measure component. 3) photoelectricity coder (Encoder) : A kind of accurate angular displacement, rotate speed measures component, feedback regards as component in suiting to control a system in the position. 4) PLC: Industrial computation, control equipment, realize the control function such as logistic, sequential, computation, move those who change control system to go up as whole each commonly a lead plane. 5) HMI (Human-MachineInterface) : Person - machine interface. 6) spot bus line (Field-BusSystem) : Application controls the system of serial communication bus line of the spot at industry, reduce wiring cost substantially, increase capacity of pilot interference rejection. 7) distributed control (Distributedcontrol) : Distinction is controlled at traditional collect Chinese style, the intelligence that emphasizes each node equipment is changed, general by system of spot bus line each child equipment join rises. Raise the flexibility of systematic application, dependability greatly, reduce go up the operation burden of a machine. 11, about 3 term of electric machinery: 1) defend grade (ProtectionCode) : (IP** ) inspect an equipment to prevent an eyewinker to enter with waterproof ability, make one of IEC standards. Its two numbers are represented respectively prevent eyewinker and waterproof ability, numerical value makes clear higher can enter in order to prevent pettier object and endure stronger flow to pound. It is IP54 commonly (dustproof, defend douse water) above defends the equipment of grade can apply at open air directly. 2) insulation grade (InsulationGrade) : Inspect an electric equipment (be aimed at electric machinery commonly) fall in the premise that assures good insulation character can ability of susceptive limit temperature rise, it is one of IEC standards. Have B class commonly (85 degrees) , F class (105 degrees) , H class (125 degrees) . 3) duty. (slightly) CNC Milling CNC Machining