phoenix6.controls.motion_magic_velocity_duty_cycle#

Module Contents#

class phoenix6.controls.motion_magic_velocity_duty_cycle.MotionMagicVelocityDutyCycle(velocity: phoenix6.units.rotations_per_second, acceleration: phoenix6.units.rotations_per_second_squared = 0.0, enable_foc: bool = True, feed_forward: float = 0.0, slot: int = 0, override_brake_dur_neutral: bool = False, limit_forward_motion: bool = False, limit_reverse_motion: bool = False)#

Requests Motion Magic® to target a final velocity using a motion profile. This allows smooth transitions between velocity set points. Users can optionally provide a duty cycle feedforward.

Motion Magic® Velocity produces a motion profile in real-time while attempting to honor the specified Acceleration and Jerk value. This control mode does not use the CruiseVelocity, Expo_kV, or Expo_kA configs. If the specified acceleration is zero, the Acceleration under Motion Magic® configuration parameter is used instead. This allows for runtime adjustment of acceleration for advanced users. Jerk is also specified in the Motion Magic® persistent configuration values. If Jerk is set to zero, Motion Magic® will produce a trapezoidal acceleration profile. Target velocity can also be changed on-the-fly and Motion Magic® will do its best to adjust the profile. This control mode is duty cycle based, so relevant closed-loop gains will use fractional duty cycle for the numerator: +1.0 represents full forward output.

Parameters:
  • velocity (rotations_per_second) – Target velocity to drive toward in rotations per second. This can be changed on-the fly.

  • acceleration (rotations_per_second_squared) – This is the absolute Acceleration to use generating the profile. If this parameter is zero, the Acceleration persistent configuration parameter is used instead. Acceleration is in rotations per second squared. If nonzero, the signage does not matter as the absolute value is used.

  • enable_foc (bool) – Set to true to use FOC commutation (requires Phoenix Pro), which increases peak power by ~15%. Set to false to use trapezoidal commutation. FOC improves motor performance by leveraging torque (current) control. However, this may be inconvenient for applications that require specifying duty cycle or voltage. CTR-Electronics has developed a hybrid method that combines the performances gains of FOC while still allowing applications to provide duty cycle or voltage demand. This not to be confused with simple sinusoidal control or phase voltage control which lacks the performance gains.

  • feed_forward (float) – Feedforward to apply in fractional units between -1 and +1.

  • slot (int) – Select which gains are applied by selecting the slot. Use the configuration api to set the gain values for the selected slot before enabling this feature. Slot must be within [0,2].

  • override_brake_dur_neutral (bool) – Set to true to static-brake the rotor when output is zero (or within deadband). Set to false to use the NeutralMode configuration setting (default). This flag exists to provide the fundamental behavior of this control when output is zero, which is to provide 0V to the motor.

  • limit_forward_motion (bool) – Set to true to force forward limiting. This allows users to use other limit switch sensors connected to robot controller. This also allows use of active sensors that require external power.

  • limit_reverse_motion (bool) – Set to true to force reverse limiting. This allows users to use other limit switch sensors connected to robot controller. This also allows use of active sensors that require external power.

property name: str#

Gets the name of this control request.

Returns:

Name of the control request

Return type:

str

property control_info: dict#

Gets information about this control request.

Returns:

Dictonary of control parameter names and corresponding applied values

Return type:

dict

velocity#

Target velocity to drive toward in rotations per second. This can be changed on-the fly.

acceleration#

This is the absolute Acceleration to use generating the profile. If this parameter is zero, the Acceleration persistent configuration parameter is used instead. Acceleration is in rotations per second squared. If nonzero, the signage does not matter as the absolute value is used.

enable_foc#

Set to true to use FOC commutation (requires Phoenix Pro), which increases peak power by ~15%. Set to false to use trapezoidal commutation. FOC improves motor performance by leveraging torque (current) control. However, this may be inconvenient for applications that require specifying duty cycle or voltage. CTR-Electronics has developed a hybrid method that combines the performances gains of FOC while still allowing applications to provide duty cycle or voltage demand. This not to be confused with simple sinusoidal control or phase voltage control which lacks the performance gains.

feed_forward#

Feedforward to apply in fractional units between -1 and +1.

slot#

Select which gains are applied by selecting the slot. Use the configuration api to set the gain values for the selected slot before enabling this feature. Slot must be within [0,2].

override_brake_dur_neutral#

Set to true to static-brake the rotor when output is zero (or within deadband). Set to false to use the NeutralMode configuration setting (default). This flag exists to provide the fundamental behavior of this control when output is zero, which is to provide 0V to the motor.

limit_forward_motion#

Set to true to force forward limiting. This allows users to use other limit switch sensors connected to robot controller. This also allows use of active sensors that require external power.

limit_reverse_motion#

Set to true to force reverse limiting. This allows users to use other limit switch sensors connected to robot controller. This also allows use of active sensors that require external power.

with_velocity(new_velocity: phoenix6.units.rotations_per_second) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s velocity parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_velocity (rotations_per_second) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_acceleration(new_acceleration: phoenix6.units.rotations_per_second_squared) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s acceleration parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_acceleration (rotations_per_second_squared) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_enable_foc(new_enable_foc: bool) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s enable_foc parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_enable_foc (bool) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_feed_forward(new_feed_forward: float) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s feed_forward parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_feed_forward (float) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_slot(new_slot: int) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s slot parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_slot (int) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_override_brake_dur_neutral(new_override_brake_dur_neutral: bool) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s override_brake_dur_neutral parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_override_brake_dur_neutral (bool) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_limit_forward_motion(new_limit_forward_motion: bool) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s limit_forward_motion parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_limit_forward_motion (bool) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_limit_reverse_motion(new_limit_reverse_motion: bool) MotionMagicVelocityDutyCycle#

Modifies this Control Request’s limit_reverse_motion parameter and returns itself for method-chaining and easier to use request API.

Parameters:

new_limit_reverse_motion (bool) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle

with_update_freq_hz(new_update_freq_hz: phoenix6.units.hertz) MotionMagicVelocityDutyCycle#

Sets the period at which this control will update at. This is designated in Hertz, with a minimum of 20 Hz (every 50 ms) and a maximum of 1000 Hz (every 1 ms).

If this field is set to 0 Hz, the control request will be sent immediately as a one-shot frame. This may be useful for advanced applications that require outputs to be synchronized with data acquisition. In this case, we recommend not exceeding 50 ms between control calls.

Parameters:

new_update_freq_hz (hertz) – Parameter to modify

Returns:

Itself

Return type:

MotionMagicVelocityDutyCycle