Hub Motor Systems
Electric motors built into the wheel hub, driving the wheel directly with no intermediate transmission. Removing the drive chain simplifies the vehicle, at the cost of added unsprung mass and reduced torque multiplication. SES holds the range as an authorised JK Fenner distributor, covering motor type Brushless DC permanent magnet; configurations Direct drive and internally geared hubs; mounting Wheel hub with fixed axle to the frame; feedback Hall sensor and sensorless control options. Executions include direct drive hub motors, geared hub motors, front wheel hub motors, rear wheel hub motors, among others. It is specified most often into electric scooters in urban duty and electric three wheelers on flat city routes. Every part is genuine JK Fenner through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Layout
Motor integrated into the wheel
Transmission
Direct drive, no reduction in most types
Trade-off
Simplicity against unsprung mass
Cooling
Passive, through the hub shell
Where it runs.
You will find Hub Motor Systems in the parts of a plant where this particular duty actually occurs. In practice that means electric scooters in urban duty, electric three wheelers on flat city routes, delivery vehicles with frequent stops, and equally electric cycles and light personal mobility, campus and last mile transport fleets. What links them is the duty rather than the machine name — layout: Motor integrated into the wheel. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the JK Fenner range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Route includes sustained gradients or heavy passenger loads — A geared hub motor or a mid drive instead of a direct drive hub. Direct drive at low road speed pulls high current with no airflow and the winding temperature climbs with nowhere to go. Vehicle runs on broken roads with sharp bumps — Account for the unsprung mass in the suspension specification. A heavy hub follows road inputs badly and hammers both the bearing and the axle mounting. Wheel is regularly removed for tyre punctures — Confirm the cable exit and connector arrangement allow it. A hub motor with hard-wired leads turns a roadside puncture into a workshop job. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Torque the axle nuts to specification and fit the supplied anti-rotation washers. A hub motor axle that creeps in the dropout chews the fork ends, and by the time it is noticed the frame needs work, not the motor.