Traction CVT Motors
Traction motors coupled to a continuously variable transmission, so the ratio changes with road speed and load instead of being fixed. The motor is held near its efficient operating point across a much wider band of vehicle speeds. SES holds the range as an authorised JK Fenner distributor, covering motor Brushless traction motor for variable ratio drive; transmission Belt type continuously variable drive; ratio Continuously variable between defined limits; control Controller matched to motor and variator behaviour. Executions include traction motor with CVT for two wheelers, traction motor with CVT for three wheelers, variator assemblies, motor, CVT and controller packages. It is specified most often into electric scooters requiring both hill start and top speed and cargo three wheelers with widely varying load. 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
Traction motor with variable ratio drive
Benefit
Efficient motor speed across the range
Ratio
Varies with speed and load
Wear item
Variator belt and roller weights
Where it runs.
You will find Traction CVT Motors in the parts of a plant where this particular duty actually occurs. In practice that means electric scooters requiring both hill start and top speed, cargo three wheelers with widely varying load, delivery vehicles on mixed urban and highway routes, and equally light electric utility vehicles, platforms converted from petrol CVT scooters. What links them is the duty rather than the machine name — layout: Traction motor with variable ratio drive. 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 runs both loaded city work and open road stretches — A CVT drive rather than a fixed ratio. A single ratio forces a compromise that either kills gradeability or caps road speed, and a mixed route punishes both. Variator is being tuned for a specific duty — Change roller weights and spring rate as a pair, and record what was fitted. Adjusting one alone moves the shift point in a way that is hard to unpick later. Vehicle carries loads well above the base specification — Confirm the variator belt rating against peak motor torque. Electric torque is available from zero speed, which is exactly where a variator belt has its lowest grip. 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.
Inspect the variator belt at the interval, not on symptoms. It wears in width rather than length, and by the time the rider notices a change in acceleration the belt is already riding low enough to damage the pulley faces.