There are two very different issues with heat:
1) The heat in the driver as it tries to put the right voltage / current on the motor
2) The heat in the motor it's self.
A given torque motor normally comes in a variety of windings. They all will accept the same amount of energy (volts x amps) to get the job done. Some are higher current / lower voltage for a given amount of energy others are lower current / higher voltage for the exact same level of energy. Any time you cut the energy into the motor in half, it's going to cool off. That's true if it's a 0.5A motor or a 25A motor. It's the volts x amps that counts, not just the amps.
The driver is trying to switch current to deliver it to the motor. The switches are primarily a resistive sort of thing. Their heat will go up by the current squared. Cutting the motor current in half will likely cut the driver heat by a factor of four. The typical driver chips are not heat sunk as well as they might be. Anything past about 1.5A seems to be a bit much for them. In some cases the magic limit is 1.2A. Different suppliers and
At the speeds we run, you can easily get the job done with a motor who's max current rating is more like 0.5A than 2.5A. The driver chips will be much happier. You can still cut the current back (to say 0.25A) and have half the energy into them to keep them cool. You will have more volts into them than into the 2.5A motors, but not more than the normal drivers at normal voltages can supply.
1) The heat in the driver as it tries to put the right voltage / current on the motor
2) The heat in the motor it's self.
A given torque motor normally comes in a variety of windings. They all will accept the same amount of energy (volts x amps) to get the job done. Some are higher current / lower voltage for a given amount of energy others are lower current / higher voltage for the exact same level of energy. Any time you cut the energy into the motor in half, it's going to cool off. That's true if it's a 0.5A motor or a 25A motor. It's the volts x amps that counts, not just the amps.
The driver is trying to switch current to deliver it to the motor. The switches are primarily a resistive sort of thing. Their heat will go up by the current squared. Cutting the motor current in half will likely cut the driver heat by a factor of four. The typical driver chips are not heat sunk as well as they might be. Anything past about 1.5A seems to be a bit much for them. In some cases the magic limit is 1.2A. Different suppliers and
At the speeds we run, you can easily get the job done with a motor who's max current rating is more like 0.5A than 2.5A. The driver chips will be much happier. You can still cut the current back (to say 0.25A) and have half the energy into them to keep them cool. You will have more volts into them than into the 2.5A motors, but not more than the normal drivers at normal voltages can supply.