Mid Drive Motor Solutions
Motors mounted centrally in the vehicle frame, driving the wheel through a reduction and final drive. Keeping mass low and central and letting the motor run in its efficient speed band gives better gradeability than a direct hub. SES holds the range as an authorised JK Fenner distributor, covering motor type Brushless permanent magnet with integral reduction; output To chain, belt or shaft final drive; mounting Frame mounted on defined bolt pattern; control Matched controller with torque and speed limits. Executions include mid drive units for two wheelers, mid drive units for three wheelers, integrated motor and reduction assemblies, motor with controller packages, among others. It is specified most often into electric motorcycles requiring gradient performance and cargo three wheelers on loaded duty. 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
Frame mounted with reduction to the wheel
Strength
Gradeability and load carrying
Mass
Low and central, fully sprung
Load path
Through the final drive, so rate it accordingly
Where it runs.
You will find Mid Drive Motor Solutions in the parts of a plant where this particular duty actually occurs. In practice that means electric motorcycles requiring gradient performance, cargo three wheelers on loaded duty, delivery vehicles in hilly terrain, and equally utility and municipal light electric vehicles, performance electric cycles, retrofit conversions of existing chassis. What links them is the duty rather than the machine name — layout: Frame mounted with reduction to 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. Vehicle must pull away fully loaded on a slope — Size the reduction so the motor sits near its efficient speed at that condition. A ratio chosen for top speed leaves the motor stalling at high current on every hill start. Motor torque now passes through the vehicle final drive — Uprate the chain, belt or gear on the output side to the motor peak. Mid drives concentrate the whole multiplied torque into one component that was often sized for a smaller engine. Enclosure sits close to the road under the frame — Add an underguard and check the ingress rating. A central motor is directly in the path of stone strike and standing water in a way a hub motor is not. 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.
Watch the frame mounting bracket, not the motor, in the first weeks of any conversion. Reaction torque at the mounting is far higher than the frame ever saw with the original engine, and cracks start at the bracket welds long before the motor gives trouble.