Integrated BLDC Motor with Driver: Simplifying Cable and Cabinet Design

A packaging machine retrofit team facing a crowded control cabinet made a simple observation: a large share of the cabinet's wiring existed only to connect drives to motors several meters away. Replacing those pairs with an integrated BLDC motor with driver changed the machine's electrical architecture more than its mechanics.

The Retrofit Setup

The machine used distributed axes: a central cabinet held drives, power supplies, and a PLC, while long motor and feedback cables ran out to each axis. Every cable run added cost, noise pickup risk, and commissioning time. The axes themselves — conveyors, feeders, and sealing stations — stayed mechanically unchanged, which kept the scope on electrical work. The team evaluated combined units that move the drive electronics out of the cabinet and onto the machine frame.

What Changes in the Bill of Materials

With motor-driver integration, the long encoder and phase cables disappear. What remains is DC power, a fieldbus or IO link, and short motor leads inside the unit itself. Cabinet space frees up, cooling load drops, and cable trays simplify. The trade-off is placing electronics in the machine environment, so temperature and vibration at each mounting point need review before the change is approved.

Control Architecture After Integration

The drive moves from a central rack to the motor, which makes the bus connection the main control path. Fieldbus or simple IO links both work; the choice depends on how many axes must move in coordination. Motion profiles, torque limits, and fault codes move into the unit, shifting commissioning work from cabinet wiring to configuration.

Commissioning and Service

Commissioning becomes faster because each axis can be tested at the machine rather than traced through the cabinet. Service changes shape as well: a failed axis swaps out as one module, and spare units kept on the shelf shortened repair time on the line. The team also found that fewer long cable runs meant fewer intermittent faults to chase.

When the Approach Fits

Integrated units suit distributed machines with several axes, such as packaging, printing, and converting lines. They fit less well where electronics must stay in clean, cooled environments while the motor runs hot or dirty duty. Battery-powered and mobile machines benefit too, since removing a central cabinet suits designs with no room for one. Matching the environmental rating of the motor-driver integration units to actual machine conditions is the deciding step.

The retrofit changed the project's electrical character: fewer cables, a smaller cabinet, and commissioning done at the machine. None of it required a different motor topology — only a different place for the drive to live. Machine builders planning their next distributed-axis design can review catalog data on integrated units before the cable schedule is drawn.