Toshiba has disclosed a new attempt to apply SiC-made diodes to drive railroad vehicle motor inverter devices. The purpose of the development is to replace the conventional Si diode with a Schottky barrier diode (SBD) made of SiC, thereby reducing power loss and achieving miniaturization of the inverter. The current development is underway and the goal is to complete the practical application by the 2013 fiscal year.
Toshiba envisages that the products made of SiC SBD are the inverters of the permanent magnet synchronous motor drive system equipped under the railroad floor. Compared with the conventional induction motor drive system, the permanent magnet synchronous motor is characterized in that the "power consumption of the drive system can be reduced by about 20%" (narrator). At present, Tokyo Metro vehicles using the permanent magnet synchronous motor drive system developed by Toshiba have been put into operation.
Although the permanent magnet synchronous motor has the advantage of low power consumption, the inverter is larger than the induction motor. This is because when an induction motor is used, one inverter can drive four motors, and when using a permanent magnet synchronous motor, each motor "needs a separate inverter" (narrator), which requires four inverters. .
Therefore, the inverter occupies a larger volume than the induction motor. For this reason, the use of SiC SBD to reduce the loss, so that the inverter (including the cooling mechanism and the subfloor installation casing, etc.) volume reduction of about 40% (see this site report) idea came into being. For example, the cooling mechanism of the inverter is reduced, and each miniaturized inverter is integrated into one unit. The goal is to make the inverter's volume comparable to that of using an induction motor drive system.
The detailed performance parameters of the SBD are not disclosed. From the current introduction, the relevant parameters are SBD withstand voltage of 1.7kV or more, current capacity of tens of A, and chip size of 7mm x 4mm. Manufactured using a 4-inch SiC substrate. In addition, Toshiba assumes that the power of the permanent magnet synchronous motor using this inverter is about 200 kW that is common in railway vehicle motors.
Toshiba envisages that the products made of SiC SBD are the inverters of the permanent magnet synchronous motor drive system equipped under the railroad floor. Compared with the conventional induction motor drive system, the permanent magnet synchronous motor is characterized in that the "power consumption of the drive system can be reduced by about 20%" (narrator). At present, Tokyo Metro vehicles using the permanent magnet synchronous motor drive system developed by Toshiba have been put into operation.
Although the permanent magnet synchronous motor has the advantage of low power consumption, the inverter is larger than the induction motor. This is because when an induction motor is used, one inverter can drive four motors, and when using a permanent magnet synchronous motor, each motor "needs a separate inverter" (narrator), which requires four inverters. .
Therefore, the inverter occupies a larger volume than the induction motor. For this reason, the use of SiC SBD to reduce the loss, so that the inverter (including the cooling mechanism and the subfloor installation casing, etc.) volume reduction of about 40% (see this site report) idea came into being. For example, the cooling mechanism of the inverter is reduced, and each miniaturized inverter is integrated into one unit. The goal is to make the inverter's volume comparable to that of using an induction motor drive system.
The detailed performance parameters of the SBD are not disclosed. From the current introduction, the relevant parameters are SBD withstand voltage of 1.7kV or more, current capacity of tens of A, and chip size of 7mm x 4mm. Manufactured using a 4-inch SiC substrate. In addition, Toshiba assumes that the power of the permanent magnet synchronous motor using this inverter is about 200 kW that is common in railway vehicle motors.
APG Appliance (Machine) Co., Ltd. , http://www.nbcookingpot.com