The Impulse motors from Derby Cycle – constructional changes in 2018

It’s August 2017, event in Cloppenburg at Derby Cycle – it’s an obligatory event for everybody, who had troubles within the last two years with the Impulse2.0 and EVO motors. The customers are bothered and discontented. The dealers are in the line of fire between frustrated pedelec bikers with their motor problems and Derby Cycles field stuff that denied that there exist problems with the motors. But a dealer needs customers. So what should a dealer do? He calms down the customers and changed the motor, well knowing that the next failure will occur in a few month. That’s the normal process of all dealers – really all dealers? No! A few people put the screws on Derby, they want solutions and a reliable motor for their customers, else they will thread with consequences.

It’s unknown how many pedlecs were sold in 2014, 2015 and 2016 and how many of them where send back due to irreparable or periodicly motor failures. Most of them got back nearly the full amound of money. There were a lot of bike returns, the known cases written in the internet forums are only the tip of the iceberg. A really huge economic loss! A really huge damage to Derby Cycles image! Due to a Joint-Venture between Daum and Derby Cycle both sides are interested in a failure free working and reliable motor – a very long working motor.

I set up an assertation, a very high percentage of the motors (Impulse2.0 vrom 2014 to end of 2016) will fail before the 10.000km mark due to the known failures: defective pawls, loss of power, heavy vibrations and noise, clacking or a blocked shaft.

Hence the Impulse2.0 got a contructional change in combination with a software update, see also Differences between Derby Cycles Impulse2.0 and Impulse2.2. Now the EVO and EVO RS motors are in focus of a further development.

The constructional changes are:

  1. New tooth geometry of large gear and change to a German automotive supplier
  2. New 4-stroke free-wheel of the Taiwanese specialist KTImpulseEVO2018_2
  3. New grease managementImpulseEVO2018_1a
  4. Reduction of the bearing tolerance of the torque sensor
  5. Fine-balanced rotor
  6. Optimized gluing of the torque sensorImpulseEVO2018_6

These  are probably the root causes for a lot of the occured motor defect. If the  Impulse2.2 and the 2018 EVO motors are at the customers and proof that they are significantly more durable, Daum and Derby Cycle can finally start to earn money the motors.

With a working, reliable and durable motor Derby Cycles pedelecs, especially the eMTB’s are great bikes for everyday, sport and fun!

 

With a working, reliable and durable motor Derby Cycles pedelecs, especially the eMTB’s are great bikes for everyday, sport and fun!

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