Control techniques for motor driven systems
AssigneeAnalog Devices, Inc.
InventorsColin Lyden, Javier Calpe-Maravilla, Mark Murphy, Eoin English
Life of this patent
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Abstract
Embodiments of the present invention provide a drive signal for a motor-driven mechanical system whose frequency distribution has zero (or near zero) energy at the expected resonant frequency of the mechanical system. The drive signal may be provided as a pair of steps sufficient to activate movement of the mechanical system and then park the mechanical system at a destination position. The steps are spaced in time so as to have substantially zero energy at an expected resonant frequency fR of the mechanical system. The drive signal may be filtered to broaden a zero-energy notch at the expected resonant frequency fR.
Claims14
A method of driving a motor-driven mechanical system, comprising:
- responsive to a codeword identifying a destination position of the mechanical system, generating a stepped drive signal having an amplitude sufficient to move the mechanical system from a start position to the destination position,
- applying a first drive signal step to a motor of the mechanical system,
- applying a second drive signal step to the motor at a time tC offset from the first step by:
- t
- c
- ≅
- 1
- 2
-
-
- f
- R
- where fR is an expected resonant frequency of the mechanical system.
A method of driving a motor-driven mechanical system, comprising:
- responsive to a codeword identifying a destination position of the mechanical system, determining a drive signal amplitude corresponding to a difference in position (AP) from a start position to the destination position,
- applying a first drive signal step to a motor of the mechanical system at half the drive signal amplitude,
- applying a second drive signal step to the motor at half the drive signal amplitude, the second step being applied at a time tC offset from the first step by:
- t
- c
- ≅
- 1
- 2
-
-
- f
- R
- where fR is an expected resonant frequency of the mechanical system.
A method of driving a motor-driven mechanical system, comprising:
- responsive to an activation signal, generating a stepped drive signal having an amplitude sufficient to move the mechanical system from a start position to the destination position,
- applying a first step of the drive signal to a motor of the mechanical system,
- applying a second drive signal step to the motor at a time tC offset from the first step by:
- t
- c
- ≅
- 1
- 2
-
-
- f
- R
- where fR is an expected resonant frequency of the mechanical system.
Dependencies are inferred from the claim text.