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Building or Buying a Wood routing table.. Beginnners guide.. / Re: Chinese spindle performance at low speed
« on: January 22, 2016, 03:50:36 PM »
Motor bearing aren't the problem and nether is burning up a motor. All VFD's only operate in V/F mode... that volts/hertz mode. This means the voltage going to the motor from the VFD decreases as the output frequency decreases. This also decrease motor torque by the square of the voltage. So motor torque takes a nose dive and at low rpm the motor simply stalls. Industrial quality VFD's have the option to operate in "vector mode" that prevents motor stall at low rpms. But now you are talking about a $1500, 3 hp drive.
The only way to operate at low speeds is use a pulley or gear reducer system to keep the motor rpm in the high ranges.
Haunyang drives are as about as low quality junk as you can get. None are UL or CE listed. They are watered down copycats of the old Toshiba G3 VFD's from the early 1980's except Haunyang uses sub quality components.
The only way to operate at low speeds is use a pulley or gear reducer system to keep the motor rpm in the high ranges.
Haunyang drives are as about as low quality junk as you can get. None are UL or CE listed. They are watered down copycats of the old Toshiba G3 VFD's from the early 1980's except Haunyang uses sub quality components.