Q: Which motors/gearmotors are reversible?

A:	All motors and gearmotors shown in this catalog are reversible. Some require a full stop before reversing.

Q: What is obtainable torque?

Q: Can continuous duty motors/gearmotors be used intermittently?

Q: Can Single speed motors and gearmotors ever be operated as adjustable speed?

A:	AC motors can be operated by a simple voltage control device to lower the input voltage to decrease the speed and to over voltage the motor to increase the speed. DC motors can be controlled by a AC input Control with a  DC output that will control low voltage motors.

Q: What is a "Synchronous" motor?

A:	A synchronous motor is an induction motor that operates directly from AC power and rotates at an exact multiple of the line frequency. Common synchronous induction motor speeds on 60 Hz are 1800 and 3600 RPM.

Q: Can more than one motor be operated from a single control?

A:

Operation of more than one motor from a single control is not normally recommended. However, when cost is a primary concern, a multiple motor/single control system with either permanent magnet motors and control may be successfully implemented. More than one permanent magnet motor may be operated with a single permanent magnet control as long as the sum of the motor currents does not exceed the rated output current of the control. Comprehensive testing is recommended because this type of system may produce fluctuating or drifting speed output. More than one motor may be operated with a single-phase control. Motor speeds should not fluctuate as long as the motors are not overloaded and the sum of the motor currents does not exceed the rated output current of the control.

Q: Which products may be operated with the shaft vertical?

A:	Motors without gearing and K-2 gearmotors may be operated in any position. Contact electrosales.com for gear mounting positions or call at (617) 666-0500.

Q: What will happen if a 60 Hz induction motor is operated on 50 Hz?

A:

A motor designed for 60 Hz operation will run at 5/6 rated speed on 50 Hz. For example, a motor rated 1700 RPM on 60 Hz will run at 1400 RPM on 50 Hz. Bodine 60 Hz type Cl motors will run hotter on 50 Hz. The motor temperature should be monitored during testing to make sure it is not overheating. 60 Hz versions of Bodine type Sl motors should not be operated on 50 Hz. See page 30 for more information on Bodine AC products.

Q: What is radial load?

A:

Radial load is a force pushing or pulling the side of the output shaft. It as shown as Fr above. Exceeding the allowable radial load for a motor or gearmotor will cause premature wear of output shaft bearings and gearing and could cause the shaft to break. Fr may be the result of a weight on the shaft, belt tension or torque transmitted through a belt, chain, gear, or certain flexible couplings. A permissible radial load, Fr, is shown for each motor and gearmotor. In calculating these values, the following assumptions were made: 1. The radial load is in the worst case direction, i.e. pushing or pulling the shaft sideways. 2. The motor or gearmotor is delivering rated torque 3. The radial load was applied at distance "d" from the hub or mounting surface. Higher radial loads may be applied closer in on the shaft. Lower radial loads are permitted further out on the shaft. 4. Flexible couplings are often used to avoid radial load. Most flexible couplings are designed so that they do not transmit radial load, however this should be verified by the coupling manufacturer.

Q: What is axial load?

A:	Axial load is a force on the output shaft into or out of the motor or gearmotor. Exceeding the allowable axial load for a motor or gearmotor will cause premature wear of output shaft bearings and gearing.