Electric Brougham Mechanism: How the Drum Controller, Battery Pack, and Chain Drive Work

Use the source vehicle’s construction

The side elevation shows a driver’s seat, enclosed cabin, under-floor cell tray and unequal front/rear wheel sizes. The driving-wheel detail uses an internal ring gear and a smaller motor pinion, replacing the previous generic drivetrain interpretation.

The enlarged pair has a representative 60-tooth ring and 20-tooth pinion. Their pitch circles share a module, their centers remain fixed to the vehicle and they turn in the same direction at a 3:1 speed ratio. These tooth counts are chosen to explain the mechanism; the source does not give them.

Rounded tooth outlines illustrate engagement rather than a manufactured tooth profile. The rolling wheel and road markers are inspection motion, not a voltage-to-road-speed simulation.

Keep historical illustration separate from circuit assumptions

The calculator retains cell count and per-cell voltage, with the former notch control relabeled as a connection comparison. The historical source used for the vehicle does not establish the previous article’s three-notch circuit or operating sequence.

Three ideal possibilities are compared: all cells in series, two equal series groups connected in parallel, and four equal series groups connected in parallel. All entered cells are used. Unequal groups are explicitly rejected rather than displaying fractional cells.

Ideal equal-group voltage

For N identical cells at Vcell volts, all-series voltage is NVcell. Dividing the pack into G equal parallel groups gives N/G series cells per group and voltage NVcell/G, provided N is divisible by G.

The comparison uses G=1,2 or 4. Connecting equal groups in parallel does not add their voltages. No capacity, current, internal resistance, controller loss or motor back-EMF is entered.

The selected comparison result follows the third control. It replaces the former unsupported per-cell margin relative to 1.85 V, which was not a general state-of-charge or operating-limit calculation.

Forty-four cells at two volts each

Forty-four cells in series give 88V. Two parallel groups of 22 series cells each give 44V. Four parallel groups of 11 series cells each give 22V. The selected option highlights its corresponding connection and voltage.

At 42 cells, all-series and two-group arrangements give 84V and 42V. Four equal groups cannot use 42 whole cells, so that result reports unequal groups. At 41 cells, neither the two-group nor four-group comparison is formed.

What the reconstruction does not claim

The cell-count slider does not establish the capacity or original battery count of the pictured vehicle. The representative gear ratio, colors, section details and timing are illustrative. No range, speed, hill-climbing capability or controller-wiring reconstruction is calculated.

The previous unsupported controller-notch history, battery limit and unrelated linear-actuator video have been removed. The calculator remains a useful ideal voltage comparison while the animation explains the documented mechanical layout.

Electric-brougham questions

Why do the wheels not speed up with voltage?

Motor characteristics and load are not inputs. Tying road speed directly to voltage here would invent performance.

Why is a parallel grouping unavailable for some cell counts?

The model requires equal whole-cell series groups using every entered cell. A fractional number of cells cannot form that arrangement.

Is the three-option comparison the brougham’s actual controller?

No. It is explicitly an ideal comparison, separate from the historical vehicle illustration.

Is the wheel gear ratio historically documented?

The internal-gear drive is documented, but the shown 60:20 counts are a representative example.