Smouser
Member
- Messages
- 782
- Location
- Amesbury, Wiltshire, UK
Hi all,
I have bought an old power hacksaw (donkey saw). It is Qualters & Smith but unfortunately the motor is 3 phase ~400v only which I do not have available.
The motor has also got an uncommon speed of 950 RPM, shaft of 16mm ish, a power output of 0.66hp and it has got some grease points for the bearings.
The way I see it I have 4 options:
1. Buy a new single phase motor of 900RPM (pretty expensive), 0.55Kw and 19mm shaft plus a cheap single pulley of approximately the correct size (somewhere in between the two existing pulleys).
2. Buy a second hand single phase motor with 1000RPM, 1.5Kw and 28mm shaft plus a cheap pulley.
3. Source a cheaper 3 phase ~240v, 900RPM motor and an inverter plus a cheap pulley. The motor is cheaper than the single phase but I will need another inverter.
4. Run the current motor with an inverter at two thirds of the rates speed and torque (not even sure it will work). https://inverterdrive.com/howto/240V-Supply-to-a-400V-AC-Motor/
One of my questions are, is option 2 even viable? Can you 'uprate' a machine's motor power without having major dramas (I understand it will be overkill and use more power)?
I look forward to your suggestions.
I have bought an old power hacksaw (donkey saw). It is Qualters & Smith but unfortunately the motor is 3 phase ~400v only which I do not have available.
The motor has also got an uncommon speed of 950 RPM, shaft of 16mm ish, a power output of 0.66hp and it has got some grease points for the bearings.
The way I see it I have 4 options:
1. Buy a new single phase motor of 900RPM (pretty expensive), 0.55Kw and 19mm shaft plus a cheap single pulley of approximately the correct size (somewhere in between the two existing pulleys).
2. Buy a second hand single phase motor with 1000RPM, 1.5Kw and 28mm shaft plus a cheap pulley.
3. Source a cheaper 3 phase ~240v, 900RPM motor and an inverter plus a cheap pulley. The motor is cheaper than the single phase but I will need another inverter.
4. Run the current motor with an inverter at two thirds of the rates speed and torque (not even sure it will work). https://inverterdrive.com/howto/240V-Supply-to-a-400V-AC-Motor/
One of my questions are, is option 2 even viable? Can you 'uprate' a machine's motor power without having major dramas (I understand it will be overkill and use more power)?
I look forward to your suggestions.