CommutationOffset Parameter

Default Value: 0

Minimum Value: 0

Maximum Value: 359

Units: degrees

Type: int

WARNING: If you set this parameter to an incorrect value, failure and damage to the motor can occur.

The CommutationOffset parameter specifies a commutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion. offset for brushless motors. You can use this parameter to compensate for misalignment between the motor and the feedback device that is used for commutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion.. Examples of feedback devices that you can use for commutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion. include Hall-effect switches and absolute encoders.

Determining the Commutation Offset for Hall-Effect Switches

Use the TuningSetMotorAngle() function to calculate the correct value for this parameter. The table that follows shows the Hall states that occur at different angles.

Table: Hall States That Occur at Different Angles

Angle Range Hall A Hall B Hall C

330° - 30°

L

L

H

30° - 90°

L

H

H

90° - 150°

L

H

L

150° - 210°

H

H

L

210° - 270°

H

L

L

270° - 330°

H

L

H

Before you apply a commutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion. offset, make sure that the order of the Hall states is the same as the order that is in this table. If the order of the Hall states is reversed, you must set the Hall CommutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion. Direction setting of the CommutationInitializationSetup Parameter to Inverted. After you configure this setting, you must set the CommutationOffset parameter to the angle that causes your motor to produce the Hall states that the table shows for 330° - 30°, which are indicated by the Hall A Input Level, Hall B Input Level, and Hall C Input Level bits of the Drive Status item.

The value of this parameter must be a positive number between 0° - 359°. Adjust negative offsets when necessary. For example if you have a -30° offset, set the value of the CommutationOffset parameter to 330°.

Determining the Commutation Offset for an EnDat Encoder or BiSS Encoder

When you configure an axis to use a feedback device that supplies an absolute position, the zero value of the feedback device must be aligned with the zero electrical angle of the motor for the drive to operate correctly. Examples of feedback devices that supply an absolute position include EnDat encoders and BiSS encoders.

To determine the commutationClosed The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion. offset, do one of these options: