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| Questions & Answers | |
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Why do some AC motor gearheads output in the same direction as the motor while others output in the opposite direction? |
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Gearheads reduce the motor speed by 1/3 to 1/180. This reduction of speed is accomplished by multiple gears. The number of gears dictates the amount of speed reduction. The rotation direction of the last gear determines the output shaft direction. |
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Can I reverse the rotation direction of the AC Induction motor if I wired it as shown on the catalog, for example 4IK25GN-AWU? |
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Yes, you can. However, please make sure the motor stops completely before switching the direction. If instantaneous reversing is required, please use the reversible motor, for example 4RK25GN-AWU. |
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I need to replace an older Oriental Motor AC induction motor with the part number 5IK60GS. What is the new part number for this motor? |
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The older GS motor has been replaced with the GU design so the new part number would be 5IK60GU. "GS" and "GU" both indicate the type of pinion shaft on this motor and what gearheads can be used with the motor. Please remember it is important to match GU motors with GU gearheads. This means if you are replacing a 5IK60GS motor with a 5IK60GU motor, you must also replace the gearhead. Likewise, the older GK-type has been replaced with GN, so be sure to use GN motors with GN gearheads. |
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I may have to put the motor in an environment of 0°F to -20°F during transport. Will this create a problem? |
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Extreme changes in temperature may lead to condensation within the motor. Should this occur, parts may rust, greatly shortening the service life. Take measures to prevent condensation. |
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Can the motors be shipped through tropical climates? |
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No. When the humidity and temperature differences within the cargo space of ships and airplanes are severe, the insulation may deteriorate due to condensation. Successful countermeasures are to ship the motors packed in sealed containers or bags containing de-oxygenating material. |
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The motor gets extremely hot. Is this all right? |
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The internal loss generated when the motor converts electrical energy to rotational movement becomes heat, making the motor hot. The motor temperature is expressed as the ambient temperature plus the temperature rise caused by loss within the motor. If internal loss within the motor is 90°F (32°C) and the ambient temperature is 85°F, the surface of the motor will be 175°F (79°C). This is not abnormal for a small motor. |
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Will large fluctuations in power supply voltage affect the motor? |
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The torque produced by the motor is affected by changes in power supply voltage. The torque the motor produces is proportional to roughly twice the power supply voltage. For example, if the voltage of a motor rated at 115 VAC fluctuates between 103.5 VAC (90%) and 126.5 VAC (110%), the torque produced will vary between 80% and 120%. When using motors under large power voltage fluctuations, remember that the torque produced will vary, so select a motor that provides a sufficient margin. |
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Can a reversible motor be used as an induction motor if the brake shoe is removed? |
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A reversible motor is not simply an induction motor with a simple braking mechanism added. The ratio of coils between the primary coil and the secondary coils in a reversible motor is different from that of an induction motor. The simple brake mechanism is added to the rear of the motor. The capacitor capacity is also increased to increase starting torque. This means that if only the brake mechanism is removed, the reversible motor will not be usable at a continuous rating like an induction motor; it will simply lose its holding power and its reversing characteristics will be reduced. |
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What does it mean to say that a reversible motor is rated for 30 minutes? |
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Reversible motors require a larger input power than induction motors to increase the starting torque and improve the instant reversing characteristics. This means that loss is high and the temperature rises more during continuous operation. If operated continuously, the motor will burn out. It is thus designed to provide maximum performance if operated for no more than 30 minutes continuously. |
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Can the speed of induction motors and reversible motors be changed? |
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The speed of single-phase (AC) induction and reversible motors is determined by the power supply frequency. To change the speed of induction and reversible motors, the power supply frequency can be changed using inverter control or gears and pulleys. If your application requires changing speed, we recommend a speed control motor. |
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Can instant reversal of a reversible motor be implemented using a SSR (solid state relay)? |
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When instant forward/reverse operation is controlled with an SSR, the SSR characteristics can cause shorts in the circuit. Time must be allowed between switching from the SSR for clockwise rotation to the SSR for counterclockwise rotation. |
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The connection diagrams shows that a capacitor must be connected. Why is this necessary? |
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Most all of Oriental Motors standard compact AC motors that fall within the broad group of single-phase induction motors are “capacitor-run motors”. To run an induction motor, a rotational magnetic field must be created. Capacitors perform the role of creating a power supply with the phase shift that is required for creating such a rotational magnetic field. Three-phase motors, by contrast, always supply power with different phases, so they do not require capacitors. |
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Can I use a capacitor other than the one that comes with the motor? |
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The capacitor that comes with the motor has a capacitance that was selected to work optimally with the motor. When another capacitor is used, it should be a motor capacitor with the same capacitance and rated voltage as the capacitor that comes with the motor. Electrolytic capacitors may not be used. |
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Can gearheads be used to reduce the motor speed to 1/18,000? |
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Yes. A gearhead with a gear ratio of 180:1 must be connected to two decimal gearheads with a gear ratio of 10:1. The permissible torque is the same as if the 180:1 gearhead were used alone. The mounting screws must also be longer. |
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Do gearheads require oiling? |
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Oriental Motor lubricates the surface of gears in gearheads with grease. Oiling is not required. |
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We wired the induction motor according to the wiring diagram, but it does not move. When we turned the shaft by hand, it started to move in the direction we turned it. What could be the cause of this? |
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In order to turn a single-phase induction motor, it is necessary to use a capacitor to create two power supplies with different phases to obtain the rotating magnetic field. Therefore, if the capacitor is not properly connected, the phenomenon described occurs. Check for a cut line or contact defect in the capacitor section. The way to check is to measure the voltage across the capacitor terminals and check whether or not it is at least 1.5 times the power supply voltage. If not, the capacitor may not be working properly. |
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How can I confirm whether the motor winding has been damaged? |
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One way to do this is to measure the resistance in the windings. For a single-phase motor, remove the capacitor and measure the resistance between the black and red leads. Now measure between the black and white. The two resistance values should be about the same. This indicates that the motor is fine. If either value is zero or close to zero, then the motor has indeed been shorted.For a 3-phase motor, measure between any 2 wires. Measure all 3 combinations and compare. |
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The manual for my motor says to keep the capacitor at least 10cm (about 4 inches) from the motor. Is there a maximum distance? |
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No, there is not a published maximum distance. However, anything within 1m is acceptable. Further than 1m, the motor may run less efficient. Long wires will result in a voltage drop. This means that the capacitor phase will have less torque. |
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What exactly does the 30-minute rating mean on reversible motors? |
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Compared to induction motors, reversible motors have a higher starting torque due to a higher capacitor value. This allows them to reverse directions instantaneously. The key factors for a 30 min. “ON” time (regardless of direction) rating are the ambient temperature and duty cycle %. As long as the motor case temperature is below 90°C, you may safely increase the duty cycle % and/or the 30-minute rating. |
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Where can I find a wiring diagram for my motor? |
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AC Motors & Gearmotors Use part number search to find connection diagram. It is located under the “More Images” tab in product specification pages. Any products not found please contact Tech Support Center 1-800-468-3982. |
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How long can the cable be extended between the 3-phase motor and the inverter? |
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The recommended maximum length is 32.8ft (10m) or less. If the application requires longer, use a polyethylene- insulated lead wire with AWG 16 or thicker. Do not exceed 164 ft (50m) doing so may result in malfunction. |
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What is the difference between a capacitor part number beginning in CHC and one that is CH? |
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CHC is the rubber insulation cap that goes on the capacitor; CH is the capacitor itself. The rubber insulation will come with the capacitor when ordered as CH***-C. Adding “-C” on the capacitor part number. |
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Are the terminals on capacitor polarity sensitive? |
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A capacitor is not polarity sensitive. See the figure below. The terminals are internally connected, when connecting wires they should be connected on opposite ends. |
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I would like to order an AC motor. Does my motor include a capacitor? |
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Add "U", for single-phase 110/115VAC or "E" for single-phase 220/230VAC on the motor part number. For example, the motor part number on the label reads 5IK90GU-AW and ordering the 5IK90GU-AW"U", this will include the rated capacitor. The rated capacitor is required for operation. |
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Is the hollow shaft of the right angle gearhead a through hole? |
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Yes, when the right-angled hollow shaft gearhead is shipped there is a plastic black cover on the back of the housing. You can remove the small screws on the cover to make it a through shaft. |
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What is the difference between a 5GN__K and a 5GN__KA gearhead? |
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Gearheads ending with the letter “K” are Japanese standard gearheads with a metric output shaft. Gearheads ending in the letters “KA” are USA standard gearheads with an inch size output shaft. |
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How much is the inrush current and the stall current of the AC Induction and AC Reversible motors, and what type of fuse or breaker should I use to protect motor? |
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The inrush current and the stall current are usually 2-3 times of the rated current. |
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