Motor Selection for Adjustable-Speed Drives Prior to the advent of the adjustable-speed drive (ASD), the polyphase induction motor operated as a constant-speed motor. Figure 1 shows the well-known ...

Figure 1: Torque versus speed and Power versus speed curve of a traction motor. One unique characteristic of motors is that they can be overloaded, i.e., they can deliver more power/torque than ...

Bafang has just unveiled its new H700 electric bicycle drive system, complete with a dual-speed automatic shifting motor and several other innovations as part of a complete e-bike drive package ...