Yaskawa Industrial Motor 8.34N.m InsF AC SERVO MOTOR SGMRV-13ANA-YR1A Drip-proof

SGMRV-05ANA-YR11

SGMRV-05ANA-YR21

SGMRV-09ANA-YR11

SGMRV-13ANA-YR1A

SGMRV-13ANA-YR21

SGMRV-13ANA-YR31

SGMRV-20ANA-YR11

SGMRV-30ANA-YR12

SGMRV-30ANA-YR21

SGMRV-37ANA-YR12

It offers a wide range of motors including Sigma 2/3/5/7 rotary AC servo motors and SERVOPACKS. These brushless motors are able to handle speeds up to 6000 rpm with options of single and dual axis models. All motors are made to be compact, reliable, and durable. SERVOPACKS are amplifiers for the motors that allow for more precise control and timing. Every model features easy-to-use software that allows you to integrate your motor/amp easily into your existing automation set up. Some of the popular models that MRO Electric and Supply can provide are:


Rotary Motors - SGM7J, SGM7A, SGM7P, SGM7G, SGMMV, SGMJV, SGMSV, and SGMVV


Gear Motors - S7J, S7A, S7P, and S7G

SERVOPACKS - SGD7W/S MECHATROLINK-III, SGD7W/S EtherCAT, SGD7S Analog, SGDV MECHATROLINK-II/III, SGDV EtherCAT, and SGDV Analog

What is the difference between having permanent magnets and having electromagnets in a DC motor? Does it make it more efficient or more powerful? Or just cheaper?

When I received this question on the High School Physics bulletin board, I sent it to John Storey who, as well as being a distinguished astronomer, is a builder of electric cars. Here's his answer:

In general, for a small motor it is much cheaper to use permanent magnets. Permanent magnet materials are continuing to improve and have become so inexpensive that even the government will on occasion send you pointless fridge magnets through the post. Permanent magnets are also more efficient, because no power is wasted generating the magnetic field. So why would one ever use a wound-field DC motor? Here's a few reasons:

• If you're building a really big motor you need a very big magnet and at some point a wound field might become cheaper, especially if a very high magnetic field is needed to create a large torque. Keep this in mind if you're designing a train. For this reason most cars have starter motors that use a wound field (although some modern cars are now using permanent magnet motors).
• With a permanent magnet the magnetic field has a fixed value (that's what "permanent" means!) Recall that the torque produced by the motor of a given geometry is equal to the product of the current through the armature and the magnetic field strength. With a wound-field motor you have the option of changing the current through the field, and hence changing the motor characteristics. This leads a range of interesting possibilities; do you put the field winding in series with the armature, in parallel, or feed it from a separately controlled source? As long as there is enough torque to overcome the load placed on the motor, internal friction etc., the weaker the magnetic field the *faster* the motor will spin (at fixed voltage). This may seem weird at first, but it's true! So, if you want a motor that can produce a lot of torque at standstill, yet spin to high speeds when the load is low (how's that train design coming along?) perhaps a wound field is the answer.
• If you want to be able to run your motor from both AC and DC (the so-called "universal" motor), the magnetic field has to reverse its polarity every half cycle of the AC power, in order that the torque on the rotor is always in the same direction. Obviously you need a wound-field motor to achieve this trick.