Stefan Mikes
Gravel e-biker
- Region
- Europe
- City
- Mazovia, PL
Did Bosch say it increased the torque or the peak power?
Throttles and California
- Thread starter gromike
- Start date
stompandgo
Well-Known Member
- Region
- USA
Torque
Stefan Mikes
Gravel e-biker
- Region
- Europe
- City
- Mazovia, PL
At what reference rotational speed?
Paper is patient.
Explaining: At the same rotational speed of the motor spindle, the torque can only increase if the mechanical output power increases.
stompandgo
Well-Known Member
- Region
- USA
Stefan Mikes
Gravel e-biker
- Region
- Europe
- City
- Mazovia, PL
ebiketuningshop is a company that makes illegal e-bikes from street legal ones.
As I said, no-one can deny the law of physics: τ = P/ω. If ω is unspecified, τ remains a marketing value of no meaning.
Stefan Mikes
Gravel e-biker
- Region
- Europe
- City
- Mazovia, PL
Let me show you Stomp how easily you can play with the numbers.
Avinox M2S Boost. 1200 W mechanical power output. 150 Nm declared torque. ω = 8 rad/s or 76 rpm.
Bosch. Let us assume the motor can produce 800 W max. Let us assume ω = 6.28 rad/s or 60 rpm. Torque = 127 Nm. Use ω=5.23 rad/s (50 rpm). The torque figure becomes 153 Nm.
In the past, Specialized, Shimano and Yamaha used 60 rpm (6.28 rad/s) as the reference. Now, the material truth does not matter anymore. It is "The War of Torque".
A similar phenomenon from the past is called "Loudness War". A standard vinyl album was mastered for the RMS of -17 dB. That was limited by the gramophone needle, which would just jump from the record's groove if the level was any higher; that gave the vinyls great dynamics. You could turn the volume knob up and admire the softest and the loudest portions of the recording. The CDs were mastered for RMS of -12 dB, still great. Then someone realised the louder the recording the better it cut on the radio. The recordings became louder and louder, with RMS = -1 dB at the extreme. Which had killed any dynamics of the music by terrible compression.
The "War of Torque" is a very similar phenomenon. Most people don't understand the physics, they just read the marketing numbers. It sells.
Avinox M2S Boost. 1200 W mechanical power output. 150 Nm declared torque. ω = 8 rad/s or 76 rpm.
Bosch. Let us assume the motor can produce 800 W max. Let us assume ω = 6.28 rad/s or 60 rpm. Torque = 127 Nm. Use ω=5.23 rad/s (50 rpm). The torque figure becomes 153 Nm.
In the past, Specialized, Shimano and Yamaha used 60 rpm (6.28 rad/s) as the reference. Now, the material truth does not matter anymore. It is "The War of Torque".
A similar phenomenon from the past is called "Loudness War". A standard vinyl album was mastered for the RMS of -17 dB. That was limited by the gramophone needle, which would just jump from the record's groove if the level was any higher; that gave the vinyls great dynamics. You could turn the volume knob up and admire the softest and the loudest portions of the recording. The CDs were mastered for RMS of -12 dB, still great. Then someone realised the louder the recording the better it cut on the radio. The recordings became louder and louder, with RMS = -1 dB at the extreme. Which had killed any dynamics of the music by terrible compression.
The "War of Torque" is a very similar phenomenon. Most people don't understand the physics, they just read the marketing numbers. It sells.
Last edited:
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