If 1500 to 2000w, it is quite dangerous to use it for long time with the home grade transformer. Please re-think, the safety. I know that the Japan version is cheaper, but the good transformer for 2000w cost around HKD2,000-3000 (Made in Japan for ppl use their 100V electric goods in HK).
For safety reason, buy the step down transformer with 2 times the power (i.e. if the fan use 1000W, buy 2000VA transformer) . When you turn on the machine, they are likely to use more power to drive and it become stabilize later on.
Please note some people said switching step down transformer cannot use if the electronic 内置微电脑主板（附着温度传感器等，一般有液晶显示屏的）的电器 (e.g. 微波炉，电饭煲，电视机，电脑，CD/MD播放器，电冰箱，冷热风扇，洗衣机，家用空气过滤机等大家电。)
In this case, NEVER NEVER buy switching step down transformer, have to use 环牛变压牛.
Always turns on the step down transformer before turn on the fan to protect your electronic.