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Application solution · MEDICAL

Medical Equipment Motion Control

Quick answer

What motion-control components are used in CT, MRI, DR and SPECT equipment?

Medical-imaging equipment may use servo drives, motors, feedback and application-specific control for gantry, bed or detector-column axes. The review considers Kinco JD-series drives, SMH motors and compact-drive options against the motion profile, EMC, feedback, failure behavior and regulatory boundary.

Medical imaging equipment OEMs and integrators building MRI, CT, DR, and SPECT systems — gantry rotation, hospital bed positioning, detector column motion, with stringent certification and lifecycle requirements.

Reference architecture · Model-specific review

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Kinco iSMD integrated servo motor and drive
iSMD shown as one candidate auxiliary axis, not a complete medical system.

Control problem

What must this application control?

CT Gantry Motion

  • Compare belt and direct-drive routes against required speed, accuracy, mechanical risk and regulatory scope; no universal sub-0.25 s result is assumed
  • Low-end CT: JD430 + SMH incremental encoder motor
  • Mid-range CT: JD620 + SMH absolute encoder motor

Hospital Bed & Column

  • MRI bed: OD124S compact drive + SMH motor (space-constrained installations)
  • DR column: FD114-CS-000 drive + integrated Maxon/Dunker motor+reducer + TUI 2.0 HMI
  • Brushed motor servo control for precise position retention

SPECT & Other

  • SPECT gantry: JD620 + SMH motor (or JD620 + frameless direct drive)
  • Auxiliary axes: iSMD series integrated servo for compactness
  • EtherCAT trend across new high-end installations

How the control stack fits together

Four scoping blocks show the review path; they are not a wiring diagram.

  1. Step 1

    Gantry motion tier

    Review the JD430, JD620 or JD640 route with the matching incremental, absolute or frameless-motor option for the equipment tier.

  2. Step 2

    Bed & column axes

    Review OD124S, FD114 and iSMD candidates against the documented bed, column and auxiliary-axis space constraints.

  3. Step 3

    Feedback & cabling

    Confirm the required encoder feedback, shielded cable routing, strain relief and battery-backup scope for movable assemblies.

  4. Step 4

    EMC & grounding boundary

    Review EN 61000-3 EMC scope, equipotential grounding and drive-enclosure grounding within the finished equipment.

Control cabinet on a medical water-treatment skid: breakers, a variable-frequency drive and a controller
Customer site — control cabinet on a water-treatment skid.

Bill of materials

Use this table to compare component roles, exact model names and key specifications before application review.

Medical Equipment Motion Control recommended bill of materials
RoleComponentKey spec
DRIVE-LOWKinco JD430Low-end CT gantry · 200–415V · multi-bus
DRIVE-MIDKinco JD620Mid-range CT / SPECT gantry
DRIVE-HIGHKinco JD640High-end CT gantry
MOTORKinco SMH (incr. encoder)200W–7.5kW · for low-end systems
MOTORKinco SMH (abs. encoder)200W–7.5kW · for mid/high-end systems
MICROKinco OD124SCompact drive · MRI hospital bed
MICROKinco FD114-CS-000Narrow column installations (DR)
HMIKinco TUI 2.0DR control HMI
INTEGRATEDKinco iSMD seriesAuxiliary-axis candidate · STO and certification scope per exact variant datasheet and equipment-level review

Configuration summary. Candidate motion components cover MRI, CT, DR and SPECT gantry, bed and detector-column axes.

This is a candidate architecture, not a quotation. an engineering BOM review checks each line against your machine, and PLC and HMI programming scopes the control work once the hardware is agreed.

What changes the component choice?

What we check
  • Selection: Candidate tier review: JD430 with incremental feedback, JD620 with absolute feedback, or JD640 with absolute feedback — subject to equipment-level engineering review.
  • Selection: A frameless direct-drive route can be evaluated where the documented gantry motion profile and regulatory change plan require it.
  • Selection: Compact drives (OD124S, FD114) where mechanical envelope is the primary constraint (e.g., column-mounted, in-bed).
  • Selection: Absolute encoder motors essential when post-power-loss position recovery is required for patient safety scenarios.
  • Wiring / protocol: Applicable EMC requirements and finished-equipment standards must be confirmed for the target market and installation
  • Wiring / protocol: Drive enclosure grounding to medical equipotential bonding bar
  • Wiring / protocol: Shielded encoder cables with strain relief; aerial-plug connectors for movable assemblies
  • Wiring / protocol: Battery-backup for absolute encoders sized for declared product lifecycle
  • Migration: Replacing imported European/Japanese motion stacks requires re-validation of dynamic motion profile, EMC immunity, and post-failure behavior per medical device QMS.
  • Migration: Existing equipment-level FDA / CE-MDR clearances do NOT carry over — substantial change to motion subsystem may trigger re-certification scope. Confirm regulatory pathway before commitment.
  • Migration: A component-level certificate does not constitute system-level medical device certification — the equipment OEM remains responsible.
Where it may not fit
  • Class III implantable or life-support equipment requiring extreme safety qualification
  • Equipment under active FDA 510(k) or CE-MDR clearance review where motion subsystem change would invalidate filing
  • Cryogenic or hyperbaric medical environments outside standard component rating
  • Component certificates do not certify the finished machine; the responsible builder or integrator retains system-level validation.

Frequently asked

Does a certified servo component certify the finished medical equipment?

No. A component declaration applies only to the named component and test scope. The equipment manufacturer remains responsible for the finished device's motion risk analysis, EMC, electrical safety, software, quality-system documentation and market-specific regulatory assessment.

What must be reviewed when changing a medical motion subsystem?

Review the motion profile, feedback, braking and failure behavior, EMC and grounding, cable routing, software changes, traceability and the effect on the existing regulatory file. The replacement remains a candidate selection subject to engineering and regulatory review.

How are medical motion-component lifecycle and spare-parts terms confirmed?

Lifecycle, last-time-buy, repair and spare-parts terms must be confirmed in the current supplier quotation or contract for the exact model. A supplier portfolio statement is not a platform-specific supply commitment; commercial scope is confirmed at RFQ.

Application review

Check this architecture against your machine

Send the payload, duty, voltage, protocol, safety scope and any existing part numbers you already know.

Request engineering review

Limits. These figures describe the stated configuration, not Automation Liberty customer results. This is a candidate architecture; exact model, compatibility, certification, availability and commercial scope are subject to engineering review and confirmed at RFQ.

Independent engineering and sourcing partner. Product names and trademarks are the property of their respective owners and are used for identification only.

Why no list price? Every quote follows an engineering review of your application — you get a validated price, not a catalog number.

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