Drive technology for AC and DC

Definitions for EC motorsAll information is based on the measuring conditions mentioned below. The values mentioned aretypical values for the design in question and are also subject to the tolerances included in the specificationdrawings. Unless otherwise stated, the supplements and safety notes contained in therelevant manual and / or in the specification drawings must be observed at all times.Nominal voltage U BN [V DC]The DC voltage that is applied to the commutation electronics as asystem supply voltage. All nominal values listed in the technical tables ofthe individual motors refer to this voltage. The system can, however, beoperated at other voltages within limits defined at the lower end by thereliability of the electronic components at low voltages and at the higherend by the mechanical speed limitations of the motor and ability of theelectronic components to survive the high voltages and currents. Formotors with integrated operating electronics, the permissible operatingvoltage range is determined by the electronics. For these motors, the permittedrange is specified as an additional table value. For drive systemsthat have a separate supply for power and logic (example: VDC-3-49.15),the nominal voltage is called UN, which applies to both the power andlogic supply. The designation UB is then used for the low-power logicsupply of these drives. The ripple of the supply voltage should not exceed3.5 %, as higher ripple means poorer efficiency and control quality.Nominal speed n N [rpm]The speed at which the motor may be operated continuously whiledelivering nominal torque at an ambient temperature of 40 °C and nominaloutput torque. It is an operating point on the max. motor curve basedon an ideal electronics with negligible losses. When using an electronicswith non-negligible losses or with PWM-pulsing, the nominal speed thatcan be achieved is reduced accordingly when the supply voltage remainsconstant..Nominal torque M N [mNm]The torque that the motor can deliver continuously at an ambient temperatureof 40 °C and nominal speed.Nominal current I BN [A]The current that is drawn from the system supplywhen the motor delivers nominal torque at nominalspeed. For drive systems that have a separate supplyfor power and logic (example: VDC-3-49.15),the nominal current is called I N . This nominal currentis the sum of the power supply (I ZK ) and thelow-power logic supply (I B ). The actual current thatcreates the torque is the current that flows in themotor lads, (Nominal current effective in the supply=I Neff ) it is generated by the operating electronicsas output current. Due to the influence of the operatingelectronics in use (operating efficiency of theelectronics and PWM pulsing), a certain deviationto the nominal current from the system supply ispossible.The illustratedcurves are idealizedrepresentationsbased onthe figures in thetables.Compact driveAC DC Commutation sequencesSystem VoltageMotorSupplyM ain SupplyTransformerElectronicsMotorU BN –I BN –I BL –P Bn0 I n0eff –I max –I Neff (each Phase)U N –I N –I L R V –L V –U i max (Phase to Phase)n N -n LM N -M Bn0P N -M max152