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Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23 359

11 Drive Dimensioning

11.7 Motor components

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Features of feedback systems

The feedback systems listed in the table differ from each other with regard to the position recogni-

tion after the supply voltage is switched off.

• For synchronous motors the rotor position information is required for switch-on. For this, the ro-

tor position within a motor revolution has to be given. This can be implemented with the fol-

lowing feedback systems:

•Resolver

• Sin/cos encoders (singleturn and multiturn)

• If the current position has to be known for positioning purposes after connecting the drive sys-

tem, the following is suitable:

• Resolvers, sin/cos encoders and SSI absolute value encoders (singleturn) for motors without

gearbox for representing a revolution.

• Sin/cos encoders and SSI absolute value encoders (multiturn) for representing several motor

revolutions.

• TTL encoders and HTL encoders do not contain any position information and thus are a reason-

ably priced solution for asynchronous machines.

 Note!

Please observe that some inverters require certain additional components.

If required, also the limit frequency of the frequency input has to be taken into consider-

ation.

The dimensioning criterion for the feedback systems is their accuracy. This is not taken

into consideration by the DSD.

• Accuracy improves in the order: resolver, incremental encoder, SinCos encoder.

• A higher pulse rate of the incremental encoders also produces a higher accuracy.

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