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7.4.9
Permanent-field synchronous motors
Description
Permanent-magnet synchronous motors that are equipped with a position encoder or a pulse
encoder with zero mark are supported.
Permanent-magnet synchronous motors without encoders are also supported for operation
without encoders.
Typical applications include direct drives with torque motors, which are characterized by high
torque at low speeds, e.g. Siemens 1FW3 series torque motors. When these drives are
deployed, gear units and mechanical parts subject to wear can be dispensed with if the
application allows this.
Electric shock when permanent magnet synchronous motors rotate
As soon as the motor rotates, a voltage is generated at the terminals, which when touched,
can result in death or severe injury.
• Electrically disconnect the motor when working on the converter.
• If it is not possible to disconnect the connecting cables to the motor, secure the motor so
Features
● Field weakening of up to approx. 1.2 x rated speed (depending on the supply voltage of
the converter and motor data, also see supplementary conditions)
● Flying restart (during operation without encoders, only when a VSM records the motor
speed and phase angle (option K51))
● Speed and torque control vector
● V/f control for diagnostics vector
● Motor identification
● Automatic rotary transducer adjustment (calibration of the encoder's zero position, not for
operation without encoders)
● Speed controller optimization (rotary measurement)
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
WARNING
that it cannot undesirably rotate, e.g. using a holding brake.
Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without an encoder
487
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