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Motor Technology

Magnetic Geared-Motor

  • Input Voltage:48V
  • Rated Power:3kW
  • Rate Torque :12 N-m
  • Speed :200 rpm
  • Reduction ratio:12

This design is using the magnetic-gear machine to alternate the traditional motor with mechanical gear box set.
Basing on this design, the higher power density and lower volume features are reached and suitable for EV which required the high torque, low speed application.

Spoke and V-type Motor for EV

  • Input Voltage:400V
  • Rated Power:80kW
  • Rate Torque :120 N-m
  • Speed :7200 rpm

This novel rotor topology combines two types of magnet arrangements (Spoke-type and V-type). The purpose of the spoke arrangement is to increase the air-gap flux density, on the other hand the V arrangement is to reduce the leakage of the spoke configuration through the shaft and enhance the structure of the rotor.
This design can achieve higher power density at smaller size which make it suitable for EV application .

Jacket cooling using helical channel with twisted section

In a helical channel, Dean vortex is induced by centrifugal force to promote heat convection, whereas the accompanying peripheral heat transfer variation is not favorable for motor cooling owing to the lower heat transfer rates along channel inner wall. By twisting the section of a helical coil, the swirl intensity, fluid mixing and turbulence intensity are boosted with the moderated peripheral heat transfer variation. As the inner cooling surface of a helical channel is in close contact with the heat source emitted from the motor stator, the beneficial cooling impacts attributed to the twisted helical cooling passage for motor cooling are amplified.

SiC (silicon-carbide) Inverter

Based on SiC MOSFET, a high-power motor driver is designed using the structure of a three-phase voltage source inverter. This architecture consists of three sets of single-phase single-arm 650V, 72 amp SiC MOSFETs, using sinusoidal vector pulse width modulation technology. Based on the low conduction loss characteristics of SiC, the carrier signal required by SVPWM is designed to be 20kHz, which is higher than the traditional 8-15kHz, which makes the drive's ripple torque when driving the motor lower than traditional systems.

Active Transmission Module

Based on the transmission feature of dual input and single output, this developed technique integrates the planetary gear and a electric motor. Different from conventional gearboxes, this transmission module enables the active regulations of the torque and speed ratios via user-defined strategy. Numbers of practical applications can be realized by this technique, such as E-CVT for vehicles, power assistance for bike, and the frequency regulator in power generation system.

Advanced Motion Control Techniques

An easy to get started design method for advanced motion control system is presented based on the chain-scattering description (CSD). The difficult optimal robust control problem can be easily resolved through the systematical calculation procedure. The developed control theories had been implemented on many mechatronics systems, such as Segway, swing control and synchronized motion control.

Impedance and Remote Haptic Control

Various of practical applications with advanced control techniques have been developed, including the impedance control and remote haptic control. Based on the adequate power assistance, the user can save their physical effort and have the desired mechanical impedance experience. The operating motion can also copied and regenerated in a remote system without solid connection, as well as the user can feel the virtual force feedback at the same time. The virtual reality operation environment is also built-up for the convincing verification of developed control techniques.

Motor Demagnetization Fault Diagnosis

This work presents an unsupervised demagnetization fault diagnosis system in PMSMs. In the diagnosis process, several physic signals obtained from the motor drive without setting up additional sensors, and the auto-encoder and K-means clustering are used to classify the fault levels. The experimental results indicate that the proposed method is feasible for demagnetization fault in PMSMs.