Torque motors

    Suppliers, Distributors, and Exporters of Torque motors

    Aakash Power is a Global Supplier, Exporter, and Distributor of Torque motors, delivering complete motor solutions to the world’s most demanding industries. Our Torque motors are approved by the international set of standards.


    INTRODUCTION

    Torque Electric motors are induction motors designed for applications which require occasional or prolonged stall, or controlled applications nearly stalled. The basic difference between a torque motor & a standard induction motor is in the shape of the speed torque curve and thermal capacity to withstand locked rotor currents. Torque motors are rated at locked rotor torque where standard motors are rated in horsepower.

    A standard squirrel cage motor tries to maintain the speed as it is loaded while a Torque motor will drop in speed as it is loaded. The desired speed can also be achieved by varying supply voltage.

    CONSTRUCTION

    Torque motors are normally induction motors of toroidal construction. Their main differences from other similar motors are their wide diameters, to allow for high levels of torque, and their thermal performance, to allow their continuous operation while drawing high current in a stalled state.

    Torque motors suitable for 415V±10%, 50Hz±5%, combined ±10%, 3 phase supply, foot mounted (B3 construction), ambient temperature 50°C, Class 'F' insulation, IP55 protection, continuous rated (S1 duty) with bare shaft & key as per IS: 325 / IEC: 60034-1.

    KW HP Torque (kg.m) Frame
    4 Pole, 1500 RPM
    0.075 0.1 0.048 63
    0.15 0.2 0.096 71
    0.22 0.3 0.144 80
    0.37 0.5 0.24 90S
    0.55 0.75 0.36 90L
    0.75 1 0.48 100L
    1.1 1.5 0.72 112M
    1.23 1.65 0.8 112M
    1.5 2 0.96 112M
    1.9 2.5 1.2 132S*
    2.2 3 1.44 132M*
    3.7 5 2.42 160M*
    5.5 7.5 3.57 160L*
    6 Pole, 1000 RPM
    0.18 0.25 0.18 90S
    0.37 0.5 0.36 90L
    0.55 0.75 0.54 100L
    0.75 1 0.72 112M
    1.1 1.5 1.08 132S*
    1.5 2 1.46 132S*
    3.7 5 3.62 160L*
    8 Pole, 750 RPM
    0.037 0.05 0.048 71
    0.075 0.1 0.096 80
    0.15 0.2 0.19 90S
    0.18 0.25 0.24 90L
    0.37 0.5 0.48 100L
    0.55 0.75 0.72 112M
    0.75 1 0.96 132S*
    1.1 1.5 1.44 132M*
    12 Pole, 500 RPM
    0.37 0.5 0.72 112M

    With forced cooling arrangement


    APPLICATION

    In the manufacturing of paper, wire, films, etc the product often is unwound, coated and rewound. Constant tension is necessary so the material is not stretched and coatings are of uniform thickness.

    It is necessary to wind the product on reels or drums with constant tension and constant linear speeds. As the product is winding on the reel the diameter will increase so the reel rotational speed must decrease in order to maintain constant linear speed. Also the motor torque must increase proportionally to the increase in diameter in order to maintain constant tension.

    A torque motor may be used as a dynamic brake, applying torque to the shaft in one direction while the connected load is actually driving the shaft in the opposite direction. This type of operation is typical of unwanders & hold back rolls. The principles of operation are similar to winders.


    KNOWLEDGE BASE & FAQ


    Mechanical or load torque is proportional to the product of force and distance. Motor current varies in relation to the amount of load torque applied. When a motor is running in steady state, the armature current is constant, and the electrical torque is equal and opposite of the mechanical torque.

    Locked Rotor or Starting Torque. The Locked Rotor Torque or Starting Torque is the torque an electrical motor develops when starting at zero speed. A high Starting Torque is more important for application or machines hard to start - like positive displacement pumps, cranes etc.
    Rated torque is the maximum continuous torque available at the design speed that allows the motor to do the work without overheating. Starting torque is the torque the motor delivers at zero speed. i.e. startup. It is also called the stall torque.

    Starting torque is the amount required to overcome the inertia of a standstill. Pull-up torque is the minimum torque generated by a motor as it accelerates from standstill to operating speed. If a motor's pull-up torque is less than that required by its application load, the motor will overheat and eventually stall.

    In synchronous motors the value of pull-out torque is a maximum value of torque which allows a synchronous motor to remain in synchronism without “pulling out” of step or synchronism... Breakdown torque for an induction motor4

    Pull Up Torque (PUT) is the minimum torque developed by the motor as it accelerates from standstill to the speed at which breakdown torque occurs. Break Down Torque (BDT) is the maximum torque that the motor is capable of developing.

    For metric SI units, power is watts, torque is newton metres and angular speed is radians per second (not rpm and not revolutions per second). Also, the unit newton metre is dimensionally equivalent to the joule, which is the unit of energy.

    The complication and maintenance associated with brushes and slip rings is a disadvantage of the wound rotor as compared to the simple squirrel cage rotor. This motor is suited for starting high inertial loads. A high starting resistance makes the high pull out torque available at zero speed.

    Rotor copper loss at no load is very less that its value is negligible. Small current is required to produce adequate torque. This test is also well-known as running light test. This test is used to evaluate the resistance and impedance of the magnetizing path of induction motor.

    When AC motors are started with full voltage (Across-the-Line Starting), they draw line amperage 300% to 600% greater than their full load running current. The magnitude of the “inrush current” (also called locked rotor amps or LRA) is determined by motor horsepower and design characteristics.


    PRICING



    Contact us for more information on Torque motors or to discuss your requirements. Enquiries are solicited for India, UAE and Africa on following Email id [email protected]

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Aakash Powertech Pvt Ltd. (APPL) is focused on National & International Marketing Of Electric Cables, Motors, Transformers & Cooling Towers.

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