Locked Rotor Operation is Available

Unlike induction motors or reversible motors, torque motors are designed to provide stable torque even under stall conditions or at very low speeds (nearly stalling). They are suitable for pushing applications that require static torque, or for loads that are usually under a locked rotor condition but are under stall conditions at the end of processes. The motors can operate continuously at 60 VAC or less. When used at voltage above 60 VAC, the motors are rated for limited duty. The motor has a 5-minute rating at 115 VAC.

NOTE: When using a motor in a locked rotor condition, the output torque becomes very large. Do not exceed the permissible torque of the gearhead. Also, ensure that the work does not hit an object and stop, since this can cause damage to the gearhead due to shock.

Suitable for Winding Applications

In an application where and object is released continuously at a constant speed and wound up with constant tension, the torque must be doubled and the speed must be halved if the diameter of the winding spool is doubled.

Voltage Control of Torque Motors

The method most commonly used to control voltage is by phase control using a triac. As shown in Fig. 1, by changing the phase angle "alpha" at which the triac switches, the input voltage is controlled as represented by the shaded areas of the graph.

Use as a Brake

By using the motor in the braking region of the speed-torque characteristics, it can serve as a brake. Constant tension operation can be achieved by applying a DC voltage.

Conforms to Major Safety Standards and Global Power Supply Voltages

Torque Motors are recognized by UL and CSA, and certified under the China Compulsory Certification System (CCC System). CE Marking is used in accordance with the Low Voltage Directive. Also, our wide range of products includes those that meet the power supply voltages of major countries in Asia, North America and Europe.

The Motor Bearing Life is Twice as Long as a Conventional Type

A motor's life is determined by its bearing. We adopted a high-performance bearing grease to lubricate this important component. As a result, the bearings of the motes last twice as long as our conventional bearings.

Protective Earth Terminal on the Motor

Application as a Reverse-Phase Brake

When a torque motor is used as a reverse-phase brake, connect the motor according to the connection diagram and apply AC voltage.

The motor operates at a speed balanced with the load according to the speed-torque characteristics, when the motor is not receiving any force that turns it in the direction opposite to the rotational magnetic field.

To use a torque motor as a brake, force the motor to rotate in the direction opposite to the rotational magnetic field at a torque greater than the starting torque of the motor. Then the torque motor in the direction opposite to the rotational magnetic field while generating a certain brake force.

Fig. 2 shows an example of speed-brake torque characteristics. When a reverse-phase brake is used, a large brake force can be obtained at the speed of 0 r/min. The reverse-phase brake is suitable for applications where tension force is required even when the motor is at standstill.

Application as an Eddy-Current Brake

When a torque motor is used as an eddy-current brake, connect the red and white lead wires of the torque motor in series, as shown in Fig. 3, and apply DC voltage. At this time, insulate the black lead wire so that it will not contact any other part of the circuit.

Fig 4. shows an example of speed - brake torque characteristics. the brake torque varies depending on the applied voltage and speed. When the speed is 0 r/min, the brake torque becomes 0 oz-in (0 N·m). the brake torque increases as the speed increases and stabilizes once the speed reaches a certain high level. A similar brake force can also be achieved whether the motor is rotating in the forward or reverse direction. An eddy-current brake is suitable for applications where tension force is required for high-speed operations or at bi-directional operations.

When a torque motor is used as a brake, continuous operating time varies depending on the specific conditions. If a torque motor is combined with a gearhead, keep the speed to 2400 r/min or below.